drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/string.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/usb/hcd.h>      /* for usbcore internals */
  47 #include <linux/cdev.h>
  48 #include <linux/notifier.h>
  49 #include <linux/security.h>
  50 #include <linux/user_namespace.h>
  51 #include <linux/scatterlist.h>
  52 #include <linux/uaccess.h>
  53 #include <linux/dma-mapping.h>
  54 #include <asm/byteorder.h>
  55 #include <linux/moduleparam.h>
  56
  57 #include "usb.h"
  58
  59 #define USB_MAXBUS                      64
  60 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  61 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  62
  63 /* Mutual exclusion for removal, open, and release */
  64 DEFINE_MUTEX(usbfs_mutex);
  65
  66 struct usb_dev_state {
  67         struct list_head list;      /* state list */
  68         struct usb_device *dev;
  69         struct file *file;
  70         spinlock_t lock;            /* protects the async urb lists */
  71         struct list_head async_pending;
  72         struct list_head async_completed;
  73         struct list_head memory_list;
  74         wait_queue_head_t wait;     /* wake up if a request completed */
  75         unsigned int discsignr;
  76         struct pid *disc_pid;
  77         const struct cred *cred;
  78         void __user *disccontext;
  79         unsigned long ifclaimed;
  80         u32 secid;
  81         u32 disabled_bulk_eps;
  82         bool privileges_dropped;
  83         unsigned long interface_allowed_mask;
  84 };
  85
  86 struct usb_memory {
  87         struct list_head memlist;
  88         int vma_use_count;
  89         int urb_use_count;
  90         u32 size;
  91         void *mem;
  92         dma_addr_t dma_handle;
  93         unsigned long vm_start;
  94         struct usb_dev_state *ps;
  95 };
  96
  97 struct async {
  98         struct list_head asynclist;
  99         struct usb_dev_state *ps;
 100         struct pid *pid;
 101         const struct cred *cred;
 102         unsigned int signr;
 103         unsigned int ifnum;
 104         void __user *userbuffer;
 105         void __user *userurb;
 106         struct urb *urb;
 107         struct usb_memory *usbm;
 108         unsigned int mem_usage;
 109         int status;
 110         u32 secid;
 111         u8 bulk_addr;
 112         u8 bulk_status;
 113 };
 114
 115 static bool usbfs_snoop;
 116 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 117 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 118
 119 static unsigned usbfs_snoop_max = 65536;
 120 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 121 MODULE_PARM_DESC(usbfs_snoop_max,
 122                 "maximum number of bytes to print while snooping");
 123
 124 #define snoop(dev, format, arg...)                              \
 125         do {                                                    \
 126                 if (usbfs_snoop)                                \
 127                         dev_info(dev, format, ## arg);          \
 128         } while (0)
 129
 130 enum snoop_when {
 131         SUBMIT, COMPLETE
 132 };
 133
 134 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 135
 136 /* Limit on the total amount of memory we can allocate for transfers */
 137 static unsigned usbfs_memory_mb = 16;
 138 module_param(usbfs_memory_mb, uint, 0644);
 139 MODULE_PARM_DESC(usbfs_memory_mb,
 140                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 141
 142 /* Hard limit, necessary to avoid arithmetic overflow */
 143 #define USBFS_XFER_MAX          (UINT_MAX / 2 - 1000000)
 144
 145 static atomic_t usbfs_memory_usage;     /* Total memory currently allocated */
 146
 147 /* Check whether it's okay to allocate more memory for a transfer */
 148 static int usbfs_increase_memory_usage(unsigned amount)
 149 {
 150         unsigned lim;
 151
 152         /*
 153          * Convert usbfs_memory_mb to bytes, avoiding overflows.
 154          * 0 means use the hard limit (effectively unlimited).
 155          */
 156         lim = ACCESS_ONCE(usbfs_memory_mb);
 157         if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
 158                 lim = USBFS_XFER_MAX;
 159         else
 160                 lim <<= 20;
 161
 162         atomic_add(amount, &usbfs_memory_usage);
 163         if (atomic_read(&usbfs_memory_usage) <= lim)
 164                 return 0;
 165         atomic_sub(amount, &usbfs_memory_usage);
 166         return -ENOMEM;
 167 }
 168
 169 /* Memory for a transfer is being deallocated */
 170 static void usbfs_decrease_memory_usage(unsigned amount)
 171 {
 172         atomic_sub(amount, &usbfs_memory_usage);
 173 }
 174
 175 static int connected(struct usb_dev_state *ps)
 176 {
 177         return (!list_empty(&ps->list) &&
 178                         ps->dev->state != USB_STATE_NOTATTACHED);
 179 }
 180
 181 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 182 {
 183         struct usb_dev_state *ps = usbm->ps;
 184         unsigned long flags;
 185
 186         spin_lock_irqsave(&ps->lock, flags);
 187         --*count;
 188         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 189                 list_del(&usbm->memlist);
 190                 spin_unlock_irqrestore(&ps->lock, flags);
 191
 192                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 193                                 usbm->dma_handle);
 194                 usbfs_decrease_memory_usage(
 195                         usbm->size + sizeof(struct usb_memory));
 196                 kfree(usbm);
 197         } else {
 198                 spin_unlock_irqrestore(&ps->lock, flags);
 199         }
 200 }
 201
 202 static void usbdev_vm_open(struct vm_area_struct *vma)
 203 {
 204         struct usb_memory *usbm = vma->vm_private_data;
 205         unsigned long flags;
 206
 207         spin_lock_irqsave(&usbm->ps->lock, flags);
 208         ++usbm->vma_use_count;
 209         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 210 }
 211
 212 static void usbdev_vm_close(struct vm_area_struct *vma)
 213 {
 214         struct usb_memory *usbm = vma->vm_private_data;
 215
 216         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 217 }
 218
 219 struct vm_operations_struct usbdev_vm_ops = {
 220         .open = usbdev_vm_open,
 221         .close = usbdev_vm_close
 222 };
 223
 224 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 225 {
 226         struct usb_memory *usbm = NULL;
 227         struct usb_dev_state *ps = file->private_data;
 228         size_t size = vma->vm_end - vma->vm_start;
 229         void *mem;
 230         unsigned long flags;
 231         dma_addr_t dma_handle;
 232         int ret;
 233
 234         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 235         if (ret)
 236                 goto error;
 237
 238         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 239         if (!usbm) {
 240                 ret = -ENOMEM;
 241                 goto error_decrease_mem;
 242         }
 243
 244         mem = usb_alloc_coherent(ps->dev, size, GFP_USER, &dma_handle);
 245         if (!mem) {
 246                 ret = -ENOMEM;
 247                 goto error_free_usbm;
 248         }
 249
 250         memset(mem, 0, size);
 251
 252         usbm->mem = mem;
 253         usbm->dma_handle = dma_handle;
 254         usbm->size = size;
 255         usbm->ps = ps;
 256         usbm->vm_start = vma->vm_start;
 257         usbm->vma_use_count = 1;
 258         INIT_LIST_HEAD(&usbm->memlist);
 259
 260         if (remap_pfn_range(vma, vma->vm_start,
 261                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 262                         size, vma->vm_page_prot) < 0) {
 263                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 264                 return -EAGAIN;
 265         }
 266
 267         vma->vm_flags |= VM_IO;
 268         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 269         vma->vm_ops = &usbdev_vm_ops;
 270         vma->vm_private_data = usbm;
 271
 272         spin_lock_irqsave(&ps->lock, flags);
 273         list_add_tail(&usbm->memlist, &ps->memory_list);
 274         spin_unlock_irqrestore(&ps->lock, flags);
 275
 276         return 0;
 277
 278 error_free_usbm:
 279         kfree(usbm);
 280 error_decrease_mem:
 281         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 282 error:
 283         return ret;
 284 }
 285
 286 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 287                            loff_t *ppos)
 288 {
 289         struct usb_dev_state *ps = file->private_data;
 290         struct usb_device *dev = ps->dev;
 291         ssize_t ret = 0;
 292         unsigned len;
 293         loff_t pos;
 294         int i;
 295
 296         pos = *ppos;
 297         usb_lock_device(dev);
 298         if (!connected(ps)) {
 299                 ret = -ENODEV;
 300                 goto err;
 301         } else if (pos < 0) {
 302                 ret = -EINVAL;
 303                 goto err;
 304         }
 305
 306         if (pos < sizeof(struct usb_device_descriptor)) {
 307                 /* 18 bytes - fits on the stack */
 308                 struct usb_device_descriptor temp_desc;
 309
 310                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 311                 le16_to_cpus(&temp_desc.bcdUSB);
 312                 le16_to_cpus(&temp_desc.idVendor);
 313                 le16_to_cpus(&temp_desc.idProduct);
 314                 le16_to_cpus(&temp_desc.bcdDevice);
 315
 316                 len = sizeof(struct usb_device_descriptor) - pos;
 317                 if (len > nbytes)
 318                         len = nbytes;
 319                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 320                         ret = -EFAULT;
 321                         goto err;
 322                 }
 323
 324                 *ppos += len;
 325                 buf += len;
 326                 nbytes -= len;
 327                 ret += len;
 328         }
 329
 330         pos = sizeof(struct usb_device_descriptor);
 331         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 332                 struct usb_config_descriptor *config =
 333                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 334                 unsigned int length = le16_to_cpu(config->wTotalLength);
 335
 336                 if (*ppos < pos + length) {
 337
 338                         /* The descriptor may claim to be longer than it
 339                          * really is.  Here is the actual allocated length. */
 340                         unsigned alloclen =
 341                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 342
 343                         len = length - (*ppos - pos);
 344                         if (len > nbytes)
 345                                 len = nbytes;
 346
 347                         /* Simply don't write (skip over) unallocated parts */
 348                         if (alloclen > (*ppos - pos)) {
 349                                 alloclen -= (*ppos - pos);
 350                                 if (copy_to_user(buf,
 351                                     dev->rawdescriptors[i] + (*ppos - pos),
 352                                     min(len, alloclen))) {
 353                                         ret = -EFAULT;
 354                                         goto err;
 355                                 }
 356                         }
 357
 358                         *ppos += len;
 359                         buf += len;
 360                         nbytes -= len;
 361                         ret += len;
 362                 }
 363
 364                 pos += length;
 365         }
 366
 367 err:
 368         usb_unlock_device(dev);
 369         return ret;
 370 }
 371
 372 /*
 373  * async list handling
 374  */
 375
 376 static struct async *alloc_async(unsigned int numisoframes)
 377 {
 378         struct async *as;
 379
 380         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 381         if (!as)
 382                 return NULL;
 383         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 384         if (!as->urb) {
 385                 kfree(as);
 386                 return NULL;
 387         }
 388         return as;
 389 }
 390
 391 static void free_async(struct async *as)
 392 {
 393         int i;
 394
 395         put_pid(as->pid);
 396         if (as->cred)
 397                 put_cred(as->cred);
 398         for (i = 0; i < as->urb->num_sgs; i++) {
 399                 if (sg_page(&as->urb->sg[i]))
 400                         kfree(sg_virt(&as->urb->sg[i]));
 401         }
 402
 403         kfree(as->urb->sg);
 404         if (as->usbm == NULL)
 405                 kfree(as->urb->transfer_buffer);
 406         else
 407                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 408
 409         kfree(as->urb->setup_packet);
 410         usb_free_urb(as->urb);
 411         usbfs_decrease_memory_usage(as->mem_usage);
 412         kfree(as);
 413 }
 414
 415 static void async_newpending(struct async *as)
 416 {
 417         struct usb_dev_state *ps = as->ps;
 418         unsigned long flags;
 419
 420         spin_lock_irqsave(&ps->lock, flags);
 421         list_add_tail(&as->asynclist, &ps->async_pending);
 422         spin_unlock_irqrestore(&ps->lock, flags);
 423 }
 424
 425 static void async_removepending(struct async *as)
 426 {
 427         struct usb_dev_state *ps = as->ps;
 428         unsigned long flags;
 429
 430         spin_lock_irqsave(&ps->lock, flags);
 431         list_del_init(&as->asynclist);
 432         spin_unlock_irqrestore(&ps->lock, flags);
 433 }
 434
 435 static struct async *async_getcompleted(struct usb_dev_state *ps)
 436 {
 437         unsigned long flags;
 438         struct async *as = NULL;
 439
 440         spin_lock_irqsave(&ps->lock, flags);
 441         if (!list_empty(&ps->async_completed)) {
 442                 as = list_entry(ps->async_completed.next, struct async,
 443                                 asynclist);
 444                 list_del_init(&as->asynclist);
 445         }
 446         spin_unlock_irqrestore(&ps->lock, flags);
 447         return as;
 448 }
 449
 450 static struct async *async_getpending(struct usb_dev_state *ps,
 451                                              void __user *userurb)
 452 {
 453         struct async *as;
 454
 455         list_for_each_entry(as, &ps->async_pending, asynclist)
 456                 if (as->userurb == userurb) {
 457                         list_del_init(&as->asynclist);
 458                         return as;
 459                 }
 460
 461         return NULL;
 462 }
 463
 464 static void snoop_urb(struct usb_device *udev,
 465                 void __user *userurb, int pipe, unsigned length,
 466                 int timeout_or_status, enum snoop_when when,
 467                 unsigned char *data, unsigned data_len)
 468 {
 469         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 470         static const char *dirs[] = {"out", "in"};
 471         int ep;
 472         const char *t, *d;
 473
 474         if (!usbfs_snoop)
 475                 return;
 476
 477         ep = usb_pipeendpoint(pipe);
 478         t = types[usb_pipetype(pipe)];
 479         d = dirs[!!usb_pipein(pipe)];
 480
 481         if (userurb) {          /* Async */
 482                 if (when == SUBMIT)
 483                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 484                                         "length %u\n",
 485                                         userurb, ep, t, d, length);
 486                 else
 487                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 488                                         "actual_length %u status %d\n",
 489                                         userurb, ep, t, d, length,
 490                                         timeout_or_status);
 491         } else {
 492                 if (when == SUBMIT)
 493                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 494                                         "timeout %d\n",
 495                                         ep, t, d, length, timeout_or_status);
 496                 else
 497                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 498                                         "status %d\n",
 499                                         ep, t, d, length, timeout_or_status);
 500         }
 501
 502         data_len = min(data_len, usbfs_snoop_max);
 503         if (data && data_len > 0) {
 504                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 505                         data, data_len, 1);
 506         }
 507 }
 508
 509 static void snoop_urb_data(struct urb *urb, unsigned len)
 510 {
 511         int i, size;
 512
 513         len = min(len, usbfs_snoop_max);
 514         if (!usbfs_snoop || len == 0)
 515                 return;
 516
 517         if (urb->num_sgs == 0) {
 518                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 519                         urb->transfer_buffer, len, 1);
 520                 return;
 521         }
 522
 523         for (i = 0; i < urb->num_sgs && len; i++) {
 524                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 525                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 526                         sg_virt(&urb->sg[i]), size, 1);
 527                 len -= size;
 528         }
 529 }
 530
 531 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 532 {
 533         unsigned i, len, size;
 534
 535         if (urb->number_of_packets > 0)         /* Isochronous */
 536                 len = urb->transfer_buffer_length;
 537         else                                    /* Non-Isoc */
 538                 len = urb->actual_length;
 539
 540         if (urb->num_sgs == 0) {
 541                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 542                         return -EFAULT;
 543                 return 0;
 544         }
 545
 546         for (i = 0; i < urb->num_sgs && len; i++) {
 547                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 548                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 549                         return -EFAULT;
 550                 userbuffer += size;
 551                 len -= size;
 552         }
 553
 554         return 0;
 555 }
 556
 557 #define AS_CONTINUATION 1
 558 #define AS_UNLINK       2
 559
 560 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 561 __releases(ps->lock)
 562 __acquires(ps->lock)
 563 {
 564         struct urb *urb;
 565         struct async *as;
 566
 567         /* Mark all the pending URBs that match bulk_addr, up to but not
 568          * including the first one without AS_CONTINUATION.  If such an
 569          * URB is encountered then a new transfer has already started so
 570          * the endpoint doesn't need to be disabled; otherwise it does.
 571          */
 572         list_for_each_entry(as, &ps->async_pending, asynclist) {
 573                 if (as->bulk_addr == bulk_addr) {
 574                         if (as->bulk_status != AS_CONTINUATION)
 575                                 goto rescan;
 576                         as->bulk_status = AS_UNLINK;
 577                         as->bulk_addr = 0;
 578                 }
 579         }
 580         ps->disabled_bulk_eps |= (1 << bulk_addr);
 581
 582         /* Now carefully unlink all the marked pending URBs */
 583  rescan:
 584         list_for_each_entry(as, &ps->async_pending, asynclist) {
 585                 if (as->bulk_status == AS_UNLINK) {
 586                         as->bulk_status = 0;            /* Only once */
 587                         urb = as->urb;
 588                         usb_get_urb(urb);
 589                         spin_unlock(&ps->lock);         /* Allow completions */
 590                         usb_unlink_urb(urb);
 591                         usb_put_urb(urb);
 592                         spin_lock(&ps->lock);
 593                         goto rescan;
 594                 }
 595         }
 596 }
 597
 598 static void async_completed(struct urb *urb)
 599 {
 600         struct async *as = urb->context;
 601         struct usb_dev_state *ps = as->ps;
 602         struct siginfo sinfo;
 603         struct pid *pid = NULL;
 604         u32 secid = 0;
 605         const struct cred *cred = NULL;
 606         int signr;
 607
 608         spin_lock(&ps->lock);
 609         list_move_tail(&as->asynclist, &ps->async_completed);
 610         as->status = urb->status;
 611         signr = as->signr;
 612         if (signr) {
 613                 memset(&sinfo, 0, sizeof(sinfo));
 614                 sinfo.si_signo = as->signr;
 615                 sinfo.si_errno = as->status;
 616                 sinfo.si_code = SI_ASYNCIO;
 617                 sinfo.si_addr = as->userurb;
 618                 pid = get_pid(as->pid);
 619                 cred = get_cred(as->cred);
 620                 secid = as->secid;
 621         }
 622         snoop(&urb->dev->dev, "urb complete\n");
 623         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 624                         as->status, COMPLETE, NULL, 0);
 625         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 626                 snoop_urb_data(urb, urb->actual_length);
 627
 628         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 629                         as->status != -ENOENT)
 630                 cancel_bulk_urbs(ps, as->bulk_addr);
 631         spin_unlock(&ps->lock);
 632
 633         if (signr) {
 634                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 635                 put_pid(pid);
 636                 put_cred(cred);
 637         }
 638
 639         wake_up(&ps->wait);
 640 }
 641
 642 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 643 {
 644         struct urb *urb;
 645         struct async *as;
 646         unsigned long flags;
 647
 648         spin_lock_irqsave(&ps->lock, flags);
 649         while (!list_empty(list)) {
 650                 as = list_entry(list->next, struct async, asynclist);
 651                 list_del_init(&as->asynclist);
 652                 urb = as->urb;
 653                 usb_get_urb(urb);
 654
 655                 /* drop the spinlock so the completion handler can run */
 656                 spin_unlock_irqrestore(&ps->lock, flags);
 657                 usb_kill_urb(urb);
 658                 usb_put_urb(urb);
 659                 spin_lock_irqsave(&ps->lock, flags);
 660         }
 661         spin_unlock_irqrestore(&ps->lock, flags);
 662 }
 663
 664 static void destroy_async_on_interface(struct usb_dev_state *ps,
 665                                        unsigned int ifnum)
 666 {
 667         struct list_head *p, *q, hitlist;
 668         unsigned long flags;
 669
 670         INIT_LIST_HEAD(&hitlist);
 671         spin_lock_irqsave(&ps->lock, flags);
 672         list_for_each_safe(p, q, &ps->async_pending)
 673                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 674                         list_move_tail(p, &hitlist);
 675         spin_unlock_irqrestore(&ps->lock, flags);
 676         destroy_async(ps, &hitlist);
 677 }
 678
 679 static void destroy_all_async(struct usb_dev_state *ps)
 680 {
 681         destroy_async(ps, &ps->async_pending);
 682 }
 683
 684 /*
 685  * interface claims are made only at the request of user level code,
 686  * which can also release them (explicitly or by closing files).
 687  * they're also undone when devices disconnect.
 688  */
 689
 690 static int driver_probe(struct usb_interface *intf,
 691                         const struct usb_device_id *id)
 692 {
 693         return -ENODEV;
 694 }
 695
 696 static void driver_disconnect(struct usb_interface *intf)
 697 {
 698         struct usb_dev_state *ps = usb_get_intfdata(intf);
 699         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 700
 701         if (!ps)
 702                 return;
 703
 704         /* NOTE:  this relies on usbcore having canceled and completed
 705          * all pending I/O requests; 2.6 does that.
 706          */
 707
 708         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 709                 clear_bit(ifnum, &ps->ifclaimed);
 710         else
 711                 dev_warn(&intf->dev, "interface number %u out of range\n",
 712                          ifnum);
 713
 714         usb_set_intfdata(intf, NULL);
 715
 716         /* force async requests to complete */
 717         destroy_async_on_interface(ps, ifnum);
 718 }
 719
 720 /* The following routines are merely placeholders.  There is no way
 721  * to inform a user task about suspend or resumes.
 722  */
 723 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 724 {
 725         return 0;
 726 }
 727
 728 static int driver_resume(struct usb_interface *intf)
 729 {
 730         return 0;
 731 }
 732
 733 struct usb_driver usbfs_driver = {
 734         .name =         "usbfs",
 735         .probe =        driver_probe,
 736         .disconnect =   driver_disconnect,
 737         .suspend =      driver_suspend,
 738         .resume =       driver_resume,
 739 };
 740
 741 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 742 {
 743         struct usb_device *dev = ps->dev;
 744         struct usb_interface *intf;
 745         int err;
 746
 747         if (ifnum >= 8*sizeof(ps->ifclaimed))
 748                 return -EINVAL;
 749         /* already claimed */
 750         if (test_bit(ifnum, &ps->ifclaimed))
 751                 return 0;
 752
 753         if (ps->privileges_dropped &&
 754                         !test_bit(ifnum, &ps->interface_allowed_mask))
 755                 return -EACCES;
 756
 757         intf = usb_ifnum_to_if(dev, ifnum);
 758         if (!intf)
 759                 err = -ENOENT;
 760         else
 761                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 762         if (err == 0)
 763                 set_bit(ifnum, &ps->ifclaimed);
 764         return err;
 765 }
 766
 767 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 768 {
 769         struct usb_device *dev;
 770         struct usb_interface *intf;
 771         int err;
 772
 773         err = -EINVAL;
 774         if (ifnum >= 8*sizeof(ps->ifclaimed))
 775                 return err;
 776         dev = ps->dev;
 777         intf = usb_ifnum_to_if(dev, ifnum);
 778         if (!intf)
 779                 err = -ENOENT;
 780         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 781                 usb_driver_release_interface(&usbfs_driver, intf);
 782                 err = 0;
 783         }
 784         return err;
 785 }
 786
 787 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 788 {
 789         if (ps->dev->state != USB_STATE_CONFIGURED)
 790                 return -EHOSTUNREACH;
 791         if (ifnum >= 8*sizeof(ps->ifclaimed))
 792                 return -EINVAL;
 793         if (test_bit(ifnum, &ps->ifclaimed))
 794                 return 0;
 795         /* if not yet claimed, claim it for the driver */
 796         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 797                  "interface %u before use\n", task_pid_nr(current),
 798                  current->comm, ifnum);
 799         return claimintf(ps, ifnum);
 800 }
 801
 802 static int findintfep(struct usb_device *dev, unsigned int ep)
 803 {
 804         unsigned int i, j, e;
 805         struct usb_interface *intf;
 806         struct usb_host_interface *alts;
 807         struct usb_endpoint_descriptor *endpt;
 808
 809         if (ep & ~(USB_DIR_IN|0xf))
 810                 return -EINVAL;
 811         if (!dev->actconfig)
 812                 return -ESRCH;
 813         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 814                 intf = dev->actconfig->interface[i];
 815                 for (j = 0; j < intf->num_altsetting; j++) {
 816                         alts = &intf->altsetting[j];
 817                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 818                                 endpt = &alts->endpoint[e].desc;
 819                                 if (endpt->bEndpointAddress == ep)
 820                                         return alts->desc.bInterfaceNumber;
 821                         }
 822                 }
 823         }
 824         return -ENOENT;
 825 }
 826
 827 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 828                            unsigned int request, unsigned int index)
 829 {
 830         int ret = 0;
 831         struct usb_host_interface *alt_setting;
 832
 833         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 834          && ps->dev->state != USB_STATE_ADDRESS
 835          && ps->dev->state != USB_STATE_CONFIGURED)
 836                 return -EHOSTUNREACH;
 837         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 838                 return 0;
 839
 840         /*
 841          * check for the special corner case 'get_device_id' in the printer
 842          * class specification, which we always want to allow as it is used
 843          * to query things like ink level, etc.
 844          */
 845         if (requesttype == 0xa1 && request == 0) {
 846                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 847                                                    index >> 8, index & 0xff);
 848                 if (alt_setting
 849                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 850                         return 0;
 851         }
 852
 853         index &= 0xff;
 854         switch (requesttype & USB_RECIP_MASK) {
 855         case USB_RECIP_ENDPOINT:
 856                 if ((index & ~USB_DIR_IN) == 0)
 857                         return 0;
 858                 ret = findintfep(ps->dev, index);
 859                 if (ret < 0) {
 860                         /*
 861                          * Some not fully compliant Win apps seem to get
 862                          * index wrong and have the endpoint number here
 863                          * rather than the endpoint address (with the
 864                          * correct direction). Win does let this through,
 865                          * so we'll not reject it here but leave it to
 866                          * the device to not break KVM. But we warn.
 867                          */
 868                         ret = findintfep(ps->dev, index ^ 0x80);
 869                         if (ret >= 0)
 870                                 dev_info(&ps->dev->dev,
 871                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 872                                         __func__, task_pid_nr(current),
 873                                         current->comm, index, index ^ 0x80);
 874                 }
 875                 if (ret >= 0)
 876                         ret = checkintf(ps, ret);
 877                 break;
 878
 879         case USB_RECIP_INTERFACE:
 880                 ret = checkintf(ps, index);
 881                 break;
 882         }
 883         return ret;
 884 }
 885
 886 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 887                                                      unsigned char ep)
 888 {
 889         if (ep & USB_ENDPOINT_DIR_MASK)
 890                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 891         else
 892                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 893 }
 894
 895 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 896                                   struct usbdevfs_streams __user *streams,
 897                                   unsigned int *num_streams_ret,
 898                                   unsigned int *num_eps_ret,
 899                                   struct usb_host_endpoint ***eps_ret,
 900                                   struct usb_interface **intf_ret)
 901 {
 902         unsigned int i, num_streams, num_eps;
 903         struct usb_host_endpoint **eps;
 904         struct usb_interface *intf = NULL;
 905         unsigned char ep;
 906         int ifnum, ret;
 907
 908         if (get_user(num_streams, &streams->num_streams) ||
 909             get_user(num_eps, &streams->num_eps))
 910                 return -EFAULT;
 911
 912         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 913                 return -EINVAL;
 914
 915         /* The XHCI controller allows max 2 ^ 16 streams */
 916         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 917                 return -EINVAL;
 918
 919         eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
 920         if (!eps)
 921                 return -ENOMEM;
 922
 923         for (i = 0; i < num_eps; i++) {
 924                 if (get_user(ep, &streams->eps[i])) {
 925                         ret = -EFAULT;
 926                         goto error;
 927                 }
 928                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 929                 if (!eps[i]) {
 930                         ret = -EINVAL;
 931                         goto error;
 932                 }
 933
 934                 /* usb_alloc/free_streams operate on an usb_interface */
 935                 ifnum = findintfep(ps->dev, ep);
 936                 if (ifnum < 0) {
 937                         ret = ifnum;
 938                         goto error;
 939                 }
 940
 941                 if (i == 0) {
 942                         ret = checkintf(ps, ifnum);
 943                         if (ret < 0)
 944                                 goto error;
 945                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 946                 } else {
 947                         /* Verify all eps belong to the same interface */
 948                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 949                                 ret = -EINVAL;
 950                                 goto error;
 951                         }
 952                 }
 953         }
 954
 955         if (num_streams_ret)
 956                 *num_streams_ret = num_streams;
 957         *num_eps_ret = num_eps;
 958         *eps_ret = eps;
 959         *intf_ret = intf;
 960
 961         return 0;
 962
 963 error:
 964         kfree(eps);
 965         return ret;
 966 }
 967
 968 static int match_devt(struct device *dev, void *data)
 969 {
 970         return dev->devt == (dev_t) (unsigned long) data;
 971 }
 972
 973 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 974 {
 975         struct device *dev;
 976
 977         dev = bus_find_device(&usb_bus_type, NULL,
 978                               (void *) (unsigned long) devt, match_devt);
 979         if (!dev)
 980                 return NULL;
 981         return to_usb_device(dev);
 982 }
 983
 984 /*
 985  * file operations
 986  */
 987 static int usbdev_open(struct inode *inode, struct file *file)
 988 {
 989         struct usb_device *dev = NULL;
 990         struct usb_dev_state *ps;
 991         int ret;
 992
 993         ret = -ENOMEM;
 994         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 995         if (!ps)
 996                 goto out_free_ps;
 997
 998         ret = -ENODEV;
 999
1000         /* Protect against simultaneous removal or release */
1001         mutex_lock(&usbfs_mutex);
1002
1003         /* usbdev device-node */
1004         if (imajor(inode) == USB_DEVICE_MAJOR)
1005                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1006
1007         mutex_unlock(&usbfs_mutex);
1008
1009         if (!dev)
1010                 goto out_free_ps;
1011
1012         usb_lock_device(dev);
1013         if (dev->state == USB_STATE_NOTATTACHED)
1014                 goto out_unlock_device;
1015
1016         ret = usb_autoresume_device(dev);
1017         if (ret)
1018                 goto out_unlock_device;
1019
1020         ps->dev = dev;
1021         ps->file = file;
1022         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1023         spin_lock_init(&ps->lock);
1024         INIT_LIST_HEAD(&ps->list);
1025         INIT_LIST_HEAD(&ps->async_pending);
1026         INIT_LIST_HEAD(&ps->async_completed);
1027         INIT_LIST_HEAD(&ps->memory_list);
1028         init_waitqueue_head(&ps->wait);
1029         ps->disc_pid = get_pid(task_pid(current));
1030         ps->cred = get_current_cred();
1031         security_task_getsecid(current, &ps->secid);
1032         smp_wmb();
1033         list_add_tail(&ps->list, &dev->filelist);
1034         file->private_data = ps;
1035         usb_unlock_device(dev);
1036         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1037                         current->comm);
1038         return ret;
1039
1040  out_unlock_device:
1041         usb_unlock_device(dev);
1042         usb_put_dev(dev);
1043  out_free_ps:
1044         kfree(ps);
1045         return ret;
1046 }
1047
1048 static int usbdev_release(struct inode *inode, struct file *file)
1049 {
1050         struct usb_dev_state *ps = file->private_data;
1051         struct usb_device *dev = ps->dev;
1052         unsigned int ifnum;
1053         struct async *as;
1054
1055         usb_lock_device(dev);
1056         usb_hub_release_all_ports(dev, ps);
1057
1058         list_del_init(&ps->list);
1059
1060         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1061                         ifnum++) {
1062                 if (test_bit(ifnum, &ps->ifclaimed))
1063                         releaseintf(ps, ifnum);
1064         }
1065         destroy_all_async(ps);
1066         usb_autosuspend_device(dev);
1067         usb_unlock_device(dev);
1068         usb_put_dev(dev);
1069         put_pid(ps->disc_pid);
1070         put_cred(ps->cred);
1071
1072         as = async_getcompleted(ps);
1073         while (as) {
1074                 free_async(as);
1075                 as = async_getcompleted(ps);
1076         }
1077
1078         kfree(ps);
1079         return 0;
1080 }
1081
1082 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1083 {
1084         struct usb_device *dev = ps->dev;
1085         struct usbdevfs_ctrltransfer ctrl;
1086         unsigned int tmo;
1087         unsigned char *tbuf;
1088         unsigned wLength;
1089         int i, pipe, ret;
1090
1091         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1092                 return -EFAULT;
1093         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1094                               ctrl.wIndex);
1095         if (ret)
1096                 return ret;
1097         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1098         if (wLength > PAGE_SIZE)
1099                 return -EINVAL;
1100         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1101                         sizeof(struct usb_ctrlrequest));
1102         if (ret)
1103                 return ret;
1104         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1105         if (!tbuf) {
1106                 ret = -ENOMEM;
1107                 goto done;
1108         }
1109         tmo = ctrl.timeout;
1110         snoop(&dev->dev, "control urb: bRequestType=%02x "
1111                 "bRequest=%02x wValue=%04x "
1112                 "wIndex=%04x wLength=%04x\n",
1113                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1114                 ctrl.wIndex, ctrl.wLength);
1115         if (ctrl.bRequestType & 0x80) {
1116                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1117                                                ctrl.wLength)) {
1118                         ret = -EINVAL;
1119                         goto done;
1120                 }
1121                 pipe = usb_rcvctrlpipe(dev, 0);
1122                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1123
1124                 usb_unlock_device(dev);
1125                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1126                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1127                                     tbuf, ctrl.wLength, tmo);
1128                 usb_lock_device(dev);
1129                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1130                           tbuf, max(i, 0));
1131                 if ((i > 0) && ctrl.wLength) {
1132                         if (copy_to_user(ctrl.data, tbuf, i)) {
1133                                 ret = -EFAULT;
1134                                 goto done;
1135                         }
1136                 }
1137         } else {
1138                 if (ctrl.wLength) {
1139                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1140                                 ret = -EFAULT;
1141                                 goto done;
1142                         }
1143                 }
1144                 pipe = usb_sndctrlpipe(dev, 0);
1145                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1146                         tbuf, ctrl.wLength);
1147
1148                 usb_unlock_device(dev);
1149                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1150                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1151                                     tbuf, ctrl.wLength, tmo);
1152                 usb_lock_device(dev);
1153                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1154         }
1155         if (i < 0 && i != -EPIPE) {
1156                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1157                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1158                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1159                            ctrl.wLength, i);
1160         }
1161         ret = i;
1162  done:
1163         free_page((unsigned long) tbuf);
1164         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1165                         sizeof(struct usb_ctrlrequest));
1166         return ret;
1167 }
1168
1169 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1170 {
1171         struct usb_device *dev = ps->dev;
1172         struct usbdevfs_bulktransfer bulk;
1173         unsigned int tmo, len1, pipe;
1174         int len2;
1175         unsigned char *tbuf;
1176         int i, ret;
1177
1178         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1179                 return -EFAULT;
1180         ret = findintfep(ps->dev, bulk.ep);
1181         if (ret < 0)
1182                 return ret;
1183         ret = checkintf(ps, ret);
1184         if (ret)
1185                 return ret;
1186         if (bulk.ep & USB_DIR_IN)
1187                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1188         else
1189                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1190         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1191                 return -EINVAL;
1192         len1 = bulk.len;
1193         if (len1 >= USBFS_XFER_MAX)
1194                 return -EINVAL;
1195         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1196         if (ret)
1197                 return ret;
1198         tbuf = kmalloc(len1, GFP_KERNEL);
1199         if (!tbuf) {
1200                 ret = -ENOMEM;
1201                 goto done;
1202         }
1203         tmo = bulk.timeout;
1204         if (bulk.ep & 0x80) {
1205                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1206                         ret = -EINVAL;
1207                         goto done;
1208                 }
1209                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1210
1211                 usb_unlock_device(dev);
1212                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1213                 usb_lock_device(dev);
1214                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1215
1216                 if (!i && len2) {
1217                         if (copy_to_user(bulk.data, tbuf, len2)) {
1218                                 ret = -EFAULT;
1219                                 goto done;
1220                         }
1221                 }
1222         } else {
1223                 if (len1) {
1224                         if (copy_from_user(tbuf, bulk.data, len1)) {
1225                                 ret = -EFAULT;
1226                                 goto done;
1227                         }
1228                 }
1229                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1230
1231                 usb_unlock_device(dev);
1232                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1233                 usb_lock_device(dev);
1234                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1235         }
1236         ret = (i < 0 ? i : len2);
1237  done:
1238         kfree(tbuf);
1239         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1240         return ret;
1241 }
1242
1243 static void check_reset_of_active_ep(struct usb_device *udev,
1244                 unsigned int epnum, char *ioctl_name)
1245 {
1246         struct usb_host_endpoint **eps;
1247         struct usb_host_endpoint *ep;
1248
1249         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1250         ep = eps[epnum & 0x0f];
1251         if (ep && !list_empty(&ep->urb_list))
1252                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1253                                 task_pid_nr(current), current->comm,
1254                                 ioctl_name, epnum);
1255 }
1256
1257 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1258 {
1259         unsigned int ep;
1260         int ret;
1261
1262         if (get_user(ep, (unsigned int __user *)arg))
1263                 return -EFAULT;
1264         ret = findintfep(ps->dev, ep);
1265         if (ret < 0)
1266                 return ret;
1267         ret = checkintf(ps, ret);
1268         if (ret)
1269                 return ret;
1270         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1271         usb_reset_endpoint(ps->dev, ep);
1272         return 0;
1273 }
1274
1275 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1276 {
1277         unsigned int ep;
1278         int pipe;
1279         int ret;
1280
1281         if (get_user(ep, (unsigned int __user *)arg))
1282                 return -EFAULT;
1283         ret = findintfep(ps->dev, ep);
1284         if (ret < 0)
1285                 return ret;
1286         ret = checkintf(ps, ret);
1287         if (ret)
1288                 return ret;
1289         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1290         if (ep & USB_DIR_IN)
1291                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1292         else
1293                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1294
1295         return usb_clear_halt(ps->dev, pipe);
1296 }
1297
1298 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1299 {
1300         struct usbdevfs_getdriver gd;
1301         struct usb_interface *intf;
1302         int ret;
1303
1304         if (copy_from_user(&gd, arg, sizeof(gd)))
1305                 return -EFAULT;
1306         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1307         if (!intf || !intf->dev.driver)
1308                 ret = -ENODATA;
1309         else {
1310                 strlcpy(gd.driver, intf->dev.driver->name,
1311                                 sizeof(gd.driver));
1312                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1313         }
1314         return ret;
1315 }
1316
1317 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1318 {
1319         struct usbdevfs_connectinfo ci = {
1320                 .devnum = ps->dev->devnum,
1321                 .slow = ps->dev->speed == USB_SPEED_LOW
1322         };
1323
1324         if (copy_to_user(arg, &ci, sizeof(ci)))
1325                 return -EFAULT;
1326         return 0;
1327 }
1328
1329 static int proc_resetdevice(struct usb_dev_state *ps)
1330 {
1331         struct usb_host_config *actconfig = ps->dev->actconfig;
1332         struct usb_interface *interface;
1333         int i, number;
1334
1335         /* Don't allow a device reset if the process has dropped the
1336          * privilege to do such things and any of the interfaces are
1337          * currently claimed.
1338          */
1339         if (ps->privileges_dropped && actconfig) {
1340                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1341                         interface = actconfig->interface[i];
1342                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1343                         if (usb_interface_claimed(interface) &&
1344                                         !test_bit(number, &ps->ifclaimed)) {
1345                                 dev_warn(&ps->dev->dev,
1346                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1347                                         number, interface->dev.driver->name, current->comm);
1348                                 return -EACCES;
1349                         }
1350                 }
1351         }
1352
1353         return usb_reset_device(ps->dev);
1354 }
1355
1356 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1357 {
1358         struct usbdevfs_setinterface setintf;
1359         int ret;
1360
1361         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1362                 return -EFAULT;
1363         ret = checkintf(ps, setintf.interface);
1364         if (ret)
1365                 return ret;
1366
1367         destroy_async_on_interface(ps, setintf.interface);
1368
1369         return usb_set_interface(ps->dev, setintf.interface,
1370                         setintf.altsetting);
1371 }
1372
1373 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1374 {
1375         int u;
1376         int status = 0;
1377         struct usb_host_config *actconfig;
1378
1379         if (get_user(u, (int __user *)arg))
1380                 return -EFAULT;
1381
1382         actconfig = ps->dev->actconfig;
1383
1384         /* Don't touch the device if any interfaces are claimed.
1385          * It could interfere with other drivers' operations, and if
1386          * an interface is claimed by usbfs it could easily deadlock.
1387          */
1388         if (actconfig) {
1389                 int i;
1390
1391                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1392                         if (usb_interface_claimed(actconfig->interface[i])) {
1393                                 dev_warn(&ps->dev->dev,
1394                                         "usbfs: interface %d claimed by %s "
1395                                         "while '%s' sets config #%d\n",
1396                                         actconfig->interface[i]
1397                                                 ->cur_altsetting
1398                                                 ->desc.bInterfaceNumber,
1399                                         actconfig->interface[i]
1400                                                 ->dev.driver->name,
1401                                         current->comm, u);
1402                                 status = -EBUSY;
1403                                 break;
1404                         }
1405                 }
1406         }
1407
1408         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1409          * so avoid usb_set_configuration()'s kick to sysfs
1410          */
1411         if (status == 0) {
1412                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1413                         status = usb_reset_configuration(ps->dev);
1414                 else
1415                         status = usb_set_configuration(ps->dev, u);
1416         }
1417
1418         return status;
1419 }
1420
1421 static struct usb_memory *
1422 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1423 {
1424         struct usb_memory *usbm = NULL, *iter;
1425         unsigned long flags;
1426         unsigned long uurb_start = (unsigned long)uurb->buffer;
1427
1428         spin_lock_irqsave(&ps->lock, flags);
1429         list_for_each_entry(iter, &ps->memory_list, memlist) {
1430                 if (uurb_start >= iter->vm_start &&
1431                                 uurb_start < iter->vm_start + iter->size) {
1432                         if (uurb->buffer_length > iter->vm_start + iter->size -
1433                                         uurb_start) {
1434                                 usbm = ERR_PTR(-EINVAL);
1435                         } else {
1436                                 usbm = iter;
1437                                 usbm->urb_use_count++;
1438                         }
1439                         break;
1440                 }
1441         }
1442         spin_unlock_irqrestore(&ps->lock, flags);
1443         return usbm;
1444 }
1445
1446 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1447                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1448                         void __user *arg)
1449 {
1450         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1451         struct usb_host_endpoint *ep;
1452         struct async *as = NULL;
1453         struct usb_ctrlrequest *dr = NULL;
1454         unsigned int u, totlen, isofrmlen;
1455         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1456         int number_of_packets = 0;
1457         unsigned int stream_id = 0;
1458         void *buf;
1459
1460         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1461                                 USBDEVFS_URB_SHORT_NOT_OK |
1462                                 USBDEVFS_URB_BULK_CONTINUATION |
1463                                 USBDEVFS_URB_NO_FSBR |
1464                                 USBDEVFS_URB_ZERO_PACKET |
1465                                 USBDEVFS_URB_NO_INTERRUPT))
1466                 return -EINVAL;
1467         if (uurb->buffer_length > 0 && !uurb->buffer)
1468                 return -EINVAL;
1469         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1470             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1471                 ifnum = findintfep(ps->dev, uurb->endpoint);
1472                 if (ifnum < 0)
1473                         return ifnum;
1474                 ret = checkintf(ps, ifnum);
1475                 if (ret)
1476                         return ret;
1477         }
1478         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1479         if (!ep)
1480                 return -ENOENT;
1481         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1482
1483         u = 0;
1484         switch (uurb->type) {
1485         case USBDEVFS_URB_TYPE_CONTROL:
1486                 if (!usb_endpoint_xfer_control(&ep->desc))
1487                         return -EINVAL;
1488                 /* min 8 byte setup packet */
1489                 if (uurb->buffer_length < 8)
1490                         return -EINVAL;
1491                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1492                 if (!dr)
1493                         return -ENOMEM;
1494                 if (copy_from_user(dr, uurb->buffer, 8)) {
1495                         ret = -EFAULT;
1496                         goto error;
1497                 }
1498                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1499                         ret = -EINVAL;
1500                         goto error;
1501                 }
1502                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1503                                       le16_to_cpup(&dr->wIndex));
1504                 if (ret)
1505                         goto error;
1506                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1507                 uurb->buffer += 8;
1508                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1509                         is_in = 1;
1510                         uurb->endpoint |= USB_DIR_IN;
1511                 } else {
1512                         is_in = 0;
1513                         uurb->endpoint &= ~USB_DIR_IN;
1514                 }
1515                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1516                         "bRequest=%02x wValue=%04x "
1517                         "wIndex=%04x wLength=%04x\n",
1518                         dr->bRequestType, dr->bRequest,
1519                         __le16_to_cpup(&dr->wValue),
1520                         __le16_to_cpup(&dr->wIndex),
1521                         __le16_to_cpup(&dr->wLength));
1522                 u = sizeof(struct usb_ctrlrequest);
1523                 break;
1524
1525         case USBDEVFS_URB_TYPE_BULK:
1526                 switch (usb_endpoint_type(&ep->desc)) {
1527                 case USB_ENDPOINT_XFER_CONTROL:
1528                 case USB_ENDPOINT_XFER_ISOC:
1529                         return -EINVAL;
1530                 case USB_ENDPOINT_XFER_INT:
1531                         /* allow single-shot interrupt transfers */
1532                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1533                         goto interrupt_urb;
1534                 }
1535                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1536                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1537                         num_sgs = 0;
1538                 if (ep->streams)
1539                         stream_id = uurb->stream_id;
1540                 break;
1541
1542         case USBDEVFS_URB_TYPE_INTERRUPT:
1543                 if (!usb_endpoint_xfer_int(&ep->desc))
1544                         return -EINVAL;
1545  interrupt_urb:
1546                 break;
1547
1548         case USBDEVFS_URB_TYPE_ISO:
1549                 /* arbitrary limit */
1550                 if (uurb->number_of_packets < 1 ||
1551                     uurb->number_of_packets > 128)
1552                         return -EINVAL;
1553                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1554                         return -EINVAL;
1555                 number_of_packets = uurb->number_of_packets;
1556                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1557                                    number_of_packets;
1558                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1559                 if (IS_ERR(isopkt)) {
1560                         ret = PTR_ERR(isopkt);
1561                         isopkt = NULL;
1562                         goto error;
1563                 }
1564                 for (totlen = u = 0; u < number_of_packets; u++) {
1565                         /*
1566                          * arbitrary limit need for USB 3.0
1567                          * bMaxBurst (0~15 allowed, 1~16 packets)
1568                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1569                          * sizemax: 1024 * 16 * 3 = 49152
1570                          */
1571                         if (isopkt[u].length > 49152) {
1572                                 ret = -EINVAL;
1573                                 goto error;
1574                         }
1575                         totlen += isopkt[u].length;
1576                 }
1577                 u *= sizeof(struct usb_iso_packet_descriptor);
1578                 uurb->buffer_length = totlen;
1579                 break;
1580
1581         default:
1582                 return -EINVAL;
1583         }
1584
1585         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1586                 ret = -EINVAL;
1587                 goto error;
1588         }
1589         if (uurb->buffer_length > 0 &&
1590                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1591                                 uurb->buffer, uurb->buffer_length)) {
1592                 ret = -EFAULT;
1593                 goto error;
1594         }
1595         as = alloc_async(number_of_packets);
1596         if (!as) {
1597                 ret = -ENOMEM;
1598                 goto error;
1599         }
1600
1601         as->usbm = find_memory_area(ps, uurb);
1602         if (IS_ERR(as->usbm)) {
1603                 ret = PTR_ERR(as->usbm);
1604                 as->usbm = NULL;
1605                 goto error;
1606         }
1607
1608         /* do not use SG buffers when memory mapped segments
1609          * are in use
1610          */
1611         if (as->usbm)
1612                 num_sgs = 0;
1613
1614         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1615              num_sgs * sizeof(struct scatterlist);
1616         ret = usbfs_increase_memory_usage(u);
1617         if (ret)
1618                 goto error;
1619         as->mem_usage = u;
1620
1621         if (num_sgs) {
1622                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1623                                       GFP_KERNEL);
1624                 if (!as->urb->sg) {
1625                         ret = -ENOMEM;
1626                         goto error;
1627                 }
1628                 as->urb->num_sgs = num_sgs;
1629                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1630
1631                 totlen = uurb->buffer_length;
1632                 for (i = 0; i < as->urb->num_sgs; i++) {
1633                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1634                         buf = kmalloc(u, GFP_KERNEL);
1635                         if (!buf) {
1636                                 ret = -ENOMEM;
1637                                 goto error;
1638                         }
1639                         sg_set_buf(&as->urb->sg[i], buf, u);
1640
1641                         if (!is_in) {
1642                                 if (copy_from_user(buf, uurb->buffer, u)) {
1643                                         ret = -EFAULT;
1644                                         goto error;
1645                                 }
1646                                 uurb->buffer += u;
1647                         }
1648                         totlen -= u;
1649                 }
1650         } else if (uurb->buffer_length > 0) {
1651                 if (as->usbm) {
1652                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1653
1654                         as->urb->transfer_buffer = as->usbm->mem +
1655                                         (uurb_start - as->usbm->vm_start);
1656                 } else {
1657                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1658                                         GFP_KERNEL);
1659                         if (!as->urb->transfer_buffer) {
1660                                 ret = -ENOMEM;
1661                                 goto error;
1662                         }
1663                         if (!is_in) {
1664                                 if (copy_from_user(as->urb->transfer_buffer,
1665                                                    uurb->buffer,
1666                                                    uurb->buffer_length)) {
1667                                         ret = -EFAULT;
1668                                         goto error;
1669                                 }
1670                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1671                                 /*
1672                                  * Isochronous input data may end up being
1673                                  * discontiguous if some of the packets are
1674                                  * short. Clear the buffer so that the gaps
1675                                  * don't leak kernel data to userspace.
1676                                  */
1677                                 memset(as->urb->transfer_buffer, 0,
1678                                                 uurb->buffer_length);
1679                         }
1680                 }
1681         }
1682         as->urb->dev = ps->dev;
1683         as->urb->pipe = (uurb->type << 30) |
1684                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1685                         (uurb->endpoint & USB_DIR_IN);
1686
1687         /* This tedious sequence is necessary because the URB_* flags
1688          * are internal to the kernel and subject to change, whereas
1689          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1690          */
1691         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1692         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1693                 u |= URB_ISO_ASAP;
1694         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1695                 u |= URB_SHORT_NOT_OK;
1696         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1697                 u |= URB_NO_FSBR;
1698         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1699                 u |= URB_ZERO_PACKET;
1700         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1701                 u |= URB_NO_INTERRUPT;
1702         as->urb->transfer_flags = u;
1703
1704         as->urb->transfer_buffer_length = uurb->buffer_length;
1705         as->urb->setup_packet = (unsigned char *)dr;
1706         dr = NULL;
1707         as->urb->start_frame = uurb->start_frame;
1708         as->urb->number_of_packets = number_of_packets;
1709         as->urb->stream_id = stream_id;
1710         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1711                         ps->dev->speed == USB_SPEED_HIGH)
1712                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1713         else
1714                 as->urb->interval = ep->desc.bInterval;
1715         as->urb->context = as;
1716         as->urb->complete = async_completed;
1717         for (totlen = u = 0; u < number_of_packets; u++) {
1718                 as->urb->iso_frame_desc[u].offset = totlen;
1719                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1720                 totlen += isopkt[u].length;
1721         }
1722         kfree(isopkt);
1723         isopkt = NULL;
1724         as->ps = ps;
1725         as->userurb = arg;
1726         if (as->usbm) {
1727                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1728
1729                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1730                 as->urb->transfer_dma = as->usbm->dma_handle +
1731                                 (uurb_start - as->usbm->vm_start);
1732         } else if (is_in && uurb->buffer_length > 0)
1733                 as->userbuffer = uurb->buffer;
1734         as->signr = uurb->signr;
1735         as->ifnum = ifnum;
1736         as->pid = get_pid(task_pid(current));
1737         as->cred = get_current_cred();
1738         security_task_getsecid(current, &as->secid);
1739         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1740                         as->urb->transfer_buffer_length, 0, SUBMIT,
1741                         NULL, 0);
1742         if (!is_in)
1743                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1744
1745         async_newpending(as);
1746
1747         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1748                 spin_lock_irq(&ps->lock);
1749
1750                 /* Not exactly the endpoint address; the direction bit is
1751                  * shifted to the 0x10 position so that the value will be
1752                  * between 0 and 31.
1753                  */
1754                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1755                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1756                                 >> 3);
1757
1758                 /* If this bulk URB is the start of a new transfer, re-enable
1759                  * the endpoint.  Otherwise mark it as a continuation URB.
1760                  */
1761                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1762                         as->bulk_status = AS_CONTINUATION;
1763                 else
1764                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1765
1766                 /* Don't accept continuation URBs if the endpoint is
1767                  * disabled because of an earlier error.
1768                  */
1769                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1770                         ret = -EREMOTEIO;
1771                 else
1772                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1773                 spin_unlock_irq(&ps->lock);
1774         } else {
1775                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1776         }
1777
1778         if (ret) {
1779                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1780                            "usbfs: usb_submit_urb returned %d\n", ret);
1781                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1782                                 0, ret, COMPLETE, NULL, 0);
1783                 async_removepending(as);
1784                 goto error;
1785         }
1786         return 0;
1787
1788  error:
1789         if (as && as->usbm)
1790                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1791         kfree(isopkt);
1792         kfree(dr);
1793         if (as)
1794                 free_async(as);
1795         return ret;
1796 }
1797
1798 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1799 {
1800         struct usbdevfs_urb uurb;
1801
1802         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1803                 return -EFAULT;
1804
1805         return proc_do_submiturb(ps, &uurb,
1806                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1807                         arg);
1808 }
1809
1810 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1811 {
1812         struct urb *urb;
1813         struct async *as;
1814         unsigned long flags;
1815
1816         spin_lock_irqsave(&ps->lock, flags);
1817         as = async_getpending(ps, arg);
1818         if (!as) {
1819                 spin_unlock_irqrestore(&ps->lock, flags);
1820                 return -EINVAL;
1821         }
1822
1823         urb = as->urb;
1824         usb_get_urb(urb);
1825         spin_unlock_irqrestore(&ps->lock, flags);
1826
1827         usb_kill_urb(urb);
1828         usb_put_urb(urb);
1829
1830         return 0;
1831 }
1832
1833 static int processcompl(struct async *as, void __user * __user *arg)
1834 {
1835         struct urb *urb = as->urb;
1836         struct usbdevfs_urb __user *userurb = as->userurb;
1837         void __user *addr = as->userurb;
1838         unsigned int i;
1839
1840         if (as->userbuffer && urb->actual_length) {
1841                 if (copy_urb_data_to_user(as->userbuffer, urb))
1842                         goto err_out;
1843         }
1844         if (put_user(as->status, &userurb->status))
1845                 goto err_out;
1846         if (put_user(urb->actual_length, &userurb->actual_length))
1847                 goto err_out;
1848         if (put_user(urb->error_count, &userurb->error_count))
1849                 goto err_out;
1850
1851         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1852                 for (i = 0; i < urb->number_of_packets; i++) {
1853                         if (put_user(urb->iso_frame_desc[i].actual_length,
1854                                      &userurb->iso_frame_desc[i].actual_length))
1855                                 goto err_out;
1856                         if (put_user(urb->iso_frame_desc[i].status,
1857                                      &userurb->iso_frame_desc[i].status))
1858                                 goto err_out;
1859                 }
1860         }
1861
1862         if (put_user(addr, (void __user * __user *)arg))
1863                 return -EFAULT;
1864         return 0;
1865
1866 err_out:
1867         return -EFAULT;
1868 }
1869
1870 static struct async *reap_as(struct usb_dev_state *ps)
1871 {
1872         DECLARE_WAITQUEUE(wait, current);
1873         struct async *as = NULL;
1874         struct usb_device *dev = ps->dev;
1875
1876         add_wait_queue(&ps->wait, &wait);
1877         for (;;) {
1878                 __set_current_state(TASK_INTERRUPTIBLE);
1879                 as = async_getcompleted(ps);
1880                 if (as || !connected(ps))
1881                         break;
1882                 if (signal_pending(current))
1883                         break;
1884                 usb_unlock_device(dev);
1885                 schedule();
1886                 usb_lock_device(dev);
1887         }
1888         remove_wait_queue(&ps->wait, &wait);
1889         set_current_state(TASK_RUNNING);
1890         return as;
1891 }
1892
1893 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1894 {
1895         struct async *as = reap_as(ps);
1896
1897         if (as) {
1898                 int retval;
1899
1900                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1901                 retval = processcompl(as, (void __user * __user *)arg);
1902                 free_async(as);
1903                 return retval;
1904         }
1905         if (signal_pending(current))
1906                 return -EINTR;
1907         return -ENODEV;
1908 }
1909
1910 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1911 {
1912         int retval;
1913         struct async *as;
1914
1915         as = async_getcompleted(ps);
1916         if (as) {
1917                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1918                 retval = processcompl(as, (void __user * __user *)arg);
1919                 free_async(as);
1920         } else {
1921                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1922         }
1923         return retval;
1924 }
1925
1926 #ifdef CONFIG_COMPAT
1927 static int proc_control_compat(struct usb_dev_state *ps,
1928                                 struct usbdevfs_ctrltransfer32 __user *p32)
1929 {
1930         struct usbdevfs_ctrltransfer __user *p;
1931         __u32 udata;
1932         p = compat_alloc_user_space(sizeof(*p));
1933         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1934             get_user(udata, &p32->data) ||
1935             put_user(compat_ptr(udata), &p->data))
1936                 return -EFAULT;
1937         return proc_control(ps, p);
1938 }
1939
1940 static int proc_bulk_compat(struct usb_dev_state *ps,
1941                         struct usbdevfs_bulktransfer32 __user *p32)
1942 {
1943         struct usbdevfs_bulktransfer __user *p;
1944         compat_uint_t n;
1945         compat_caddr_t addr;
1946
1947         p = compat_alloc_user_space(sizeof(*p));
1948
1949         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1950             get_user(n, &p32->len) || put_user(n, &p->len) ||
1951             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1952             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1953                 return -EFAULT;
1954
1955         return proc_bulk(ps, p);
1956 }
1957 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1958 {
1959         struct usbdevfs_disconnectsignal32 ds;
1960
1961         if (copy_from_user(&ds, arg, sizeof(ds)))
1962                 return -EFAULT;
1963         ps->discsignr = ds.signr;
1964         ps->disccontext = compat_ptr(ds.context);
1965         return 0;
1966 }
1967
1968 static int get_urb32(struct usbdevfs_urb *kurb,
1969                      struct usbdevfs_urb32 __user *uurb)
1970 {
1971         __u32  uptr;
1972         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1973             __get_user(kurb->type, &uurb->type) ||
1974             __get_user(kurb->endpoint, &uurb->endpoint) ||
1975             __get_user(kurb->status, &uurb->status) ||
1976             __get_user(kurb->flags, &uurb->flags) ||
1977             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1978             __get_user(kurb->actual_length, &uurb->actual_length) ||
1979             __get_user(kurb->start_frame, &uurb->start_frame) ||
1980             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1981             __get_user(kurb->error_count, &uurb->error_count) ||
1982             __get_user(kurb->signr, &uurb->signr))
1983                 return -EFAULT;
1984
1985         if (__get_user(uptr, &uurb->buffer))
1986                 return -EFAULT;
1987         kurb->buffer = compat_ptr(uptr);
1988         if (__get_user(uptr, &uurb->usercontext))
1989                 return -EFAULT;
1990         kurb->usercontext = compat_ptr(uptr);
1991
1992         return 0;
1993 }
1994
1995 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1996 {
1997         struct usbdevfs_urb uurb;
1998
1999         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2000                 return -EFAULT;
2001
2002         return proc_do_submiturb(ps, &uurb,
2003                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2004                         arg);
2005 }
2006
2007 static int processcompl_compat(struct async *as, void __user * __user *arg)
2008 {
2009         struct urb *urb = as->urb;
2010         struct usbdevfs_urb32 __user *userurb = as->userurb;
2011         void __user *addr = as->userurb;
2012         unsigned int i;
2013
2014         if (as->userbuffer && urb->actual_length) {
2015                 if (copy_urb_data_to_user(as->userbuffer, urb))
2016                         return -EFAULT;
2017         }
2018         if (put_user(as->status, &userurb->status))
2019                 return -EFAULT;
2020         if (put_user(urb->actual_length, &userurb->actual_length))
2021                 return -EFAULT;
2022         if (put_user(urb->error_count, &userurb->error_count))
2023                 return -EFAULT;
2024
2025         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2026                 for (i = 0; i < urb->number_of_packets; i++) {
2027                         if (put_user(urb->iso_frame_desc[i].actual_length,
2028                                      &userurb->iso_frame_desc[i].actual_length))
2029                                 return -EFAULT;
2030                         if (put_user(urb->iso_frame_desc[i].status,
2031                                      &userurb->iso_frame_desc[i].status))
2032                                 return -EFAULT;
2033                 }
2034         }
2035
2036         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2037                 return -EFAULT;
2038         return 0;
2039 }
2040
2041 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2042 {
2043         struct async *as = reap_as(ps);
2044
2045         if (as) {
2046                 int retval;
2047
2048                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2049                 retval = processcompl_compat(as, (void __user * __user *)arg);
2050                 free_async(as);
2051                 return retval;
2052         }
2053         if (signal_pending(current))
2054                 return -EINTR;
2055         return -ENODEV;
2056 }
2057
2058 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2059 {
2060         int retval;
2061         struct async *as;
2062
2063         as = async_getcompleted(ps);
2064         if (as) {
2065                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2066                 retval = processcompl_compat(as, (void __user * __user *)arg);
2067                 free_async(as);
2068         } else {
2069                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2070         }
2071         return retval;
2072 }
2073
2074
2075 #endif
2076
2077 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2078 {
2079         struct usbdevfs_disconnectsignal ds;
2080
2081         if (copy_from_user(&ds, arg, sizeof(ds)))
2082                 return -EFAULT;
2083         ps->discsignr = ds.signr;
2084         ps->disccontext = ds.context;
2085         return 0;
2086 }
2087
2088 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2089 {
2090         unsigned int ifnum;
2091
2092         if (get_user(ifnum, (unsigned int __user *)arg))
2093                 return -EFAULT;
2094         return claimintf(ps, ifnum);
2095 }
2096
2097 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2098 {
2099         unsigned int ifnum;
2100         int ret;
2101
2102         if (get_user(ifnum, (unsigned int __user *)arg))
2103                 return -EFAULT;
2104         ret = releaseintf(ps, ifnum);
2105         if (ret < 0)
2106                 return ret;
2107         destroy_async_on_interface(ps, ifnum);
2108         return 0;
2109 }
2110
2111 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2112 {
2113         int                     size;
2114         void                    *buf = NULL;
2115         int                     retval = 0;
2116         struct usb_interface    *intf = NULL;
2117         struct usb_driver       *driver = NULL;
2118
2119         if (ps->privileges_dropped)
2120                 return -EACCES;
2121
2122         /* alloc buffer */
2123         size = _IOC_SIZE(ctl->ioctl_code);
2124         if (size > 0) {
2125                 buf = kmalloc(size, GFP_KERNEL);
2126                 if (buf == NULL)
2127                         return -ENOMEM;
2128                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2129                         if (copy_from_user(buf, ctl->data, size)) {
2130                                 kfree(buf);
2131                                 return -EFAULT;
2132                         }
2133                 } else {
2134                         memset(buf, 0, size);
2135                 }
2136         }
2137
2138         if (!connected(ps)) {
2139                 kfree(buf);
2140                 return -ENODEV;
2141         }
2142
2143         if (ps->dev->state != USB_STATE_CONFIGURED)
2144                 retval = -EHOSTUNREACH;
2145         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2146                 retval = -EINVAL;
2147         else switch (ctl->ioctl_code) {
2148
2149         /* disconnect kernel driver from interface */
2150         case USBDEVFS_DISCONNECT:
2151                 if (intf->dev.driver) {
2152                         driver = to_usb_driver(intf->dev.driver);
2153                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2154                         usb_driver_release_interface(driver, intf);
2155                 } else
2156                         retval = -ENODATA;
2157                 break;
2158
2159         /* let kernel drivers try to (re)bind to the interface */
2160         case USBDEVFS_CONNECT:
2161                 if (!intf->dev.driver)
2162                         retval = device_attach(&intf->dev);
2163                 else
2164                         retval = -EBUSY;
2165                 break;
2166
2167         /* talk directly to the interface's driver */
2168         default:
2169                 if (intf->dev.driver)
2170                         driver = to_usb_driver(intf->dev.driver);
2171                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2172                         retval = -ENOTTY;
2173                 } else {
2174                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2175                         if (retval == -ENOIOCTLCMD)
2176                                 retval = -ENOTTY;
2177                 }
2178         }
2179
2180         /* cleanup and return */
2181         if (retval >= 0
2182                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2183                         && size > 0
2184                         && copy_to_user(ctl->data, buf, size) != 0)
2185                 retval = -EFAULT;
2186
2187         kfree(buf);
2188         return retval;
2189 }
2190
2191 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2192 {
2193         struct usbdevfs_ioctl   ctrl;
2194
2195         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2196                 return -EFAULT;
2197         return proc_ioctl(ps, &ctrl);
2198 }
2199
2200 #ifdef CONFIG_COMPAT
2201 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2202 {
2203         struct usbdevfs_ioctl32 __user *uioc;
2204         struct usbdevfs_ioctl ctrl;
2205         u32 udata;
2206
2207         uioc = compat_ptr((long)arg);
2208         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2209             __get_user(ctrl.ifno, &uioc->ifno) ||
2210             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2211             __get_user(udata, &uioc->data))
2212                 return -EFAULT;
2213         ctrl.data = compat_ptr(udata);
2214
2215         return proc_ioctl(ps, &ctrl);
2216 }
2217 #endif
2218
2219 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2220 {
2221         unsigned portnum;
2222         int rc;
2223
2224         if (get_user(portnum, (unsigned __user *) arg))
2225                 return -EFAULT;
2226         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2227         if (rc == 0)
2228                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2229                         portnum, task_pid_nr(current), current->comm);
2230         return rc;
2231 }
2232
2233 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2234 {
2235         unsigned portnum;
2236
2237         if (get_user(portnum, (unsigned __user *) arg))
2238                 return -EFAULT;
2239         return usb_hub_release_port(ps->dev, portnum, ps);
2240 }
2241
2242 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2243 {
2244         __u32 caps;
2245
2246         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2247                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2248                         USBDEVFS_CAP_DROP_PRIVILEGES;
2249         if (!ps->dev->bus->no_stop_on_short)
2250                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2251         if (ps->dev->bus->sg_tablesize)
2252                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2253
2254         if (put_user(caps, (__u32 __user *)arg))
2255                 return -EFAULT;
2256
2257         return 0;
2258 }
2259
2260 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2261 {
2262         struct usbdevfs_disconnect_claim dc;
2263         struct usb_interface *intf;
2264
2265         if (copy_from_user(&dc, arg, sizeof(dc)))
2266                 return -EFAULT;
2267
2268         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2269         if (!intf)
2270                 return -EINVAL;
2271
2272         if (intf->dev.driver) {
2273                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2274
2275                 if (ps->privileges_dropped)
2276                         return -EACCES;
2277
2278                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2279                                 strncmp(dc.driver, intf->dev.driver->name,
2280                                         sizeof(dc.driver)) != 0)
2281                         return -EBUSY;
2282
2283                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2284                                 strncmp(dc.driver, intf->dev.driver->name,
2285                                         sizeof(dc.driver)) == 0)
2286                         return -EBUSY;
2287
2288                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2289                 usb_driver_release_interface(driver, intf);
2290         }
2291
2292         return claimintf(ps, dc.interface);
2293 }
2294
2295 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2296 {
2297         unsigned num_streams, num_eps;
2298         struct usb_host_endpoint **eps;
2299         struct usb_interface *intf;
2300         int r;
2301
2302         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2303                                    &eps, &intf);
2304         if (r)
2305                 return r;
2306
2307         destroy_async_on_interface(ps,
2308                                    intf->altsetting[0].desc.bInterfaceNumber);
2309
2310         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2311         kfree(eps);
2312         return r;
2313 }
2314
2315 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2316 {
2317         unsigned num_eps;
2318         struct usb_host_endpoint **eps;
2319         struct usb_interface *intf;
2320         int r;
2321
2322         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2323         if (r)
2324                 return r;
2325
2326         destroy_async_on_interface(ps,
2327                                    intf->altsetting[0].desc.bInterfaceNumber);
2328
2329         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2330         kfree(eps);
2331         return r;
2332 }
2333
2334 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2335 {
2336         u32 data;
2337
2338         if (copy_from_user(&data, arg, sizeof(data)))
2339                 return -EFAULT;
2340
2341         /* This is an one way operation. Once privileges are
2342          * dropped, you cannot regain them. You may however reissue
2343          * this ioctl to shrink the allowed interfaces mask.
2344          */
2345         ps->interface_allowed_mask &= data;
2346         ps->privileges_dropped = true;
2347
2348         return 0;
2349 }
2350
2351 /*
2352  * NOTE:  All requests here that have interface numbers as parameters
2353  * are assuming that somehow the configuration has been prevented from
2354  * changing.  But there's no mechanism to ensure that...
2355  */
2356 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2357                                 void __user *p)
2358 {
2359         struct usb_dev_state *ps = file->private_data;
2360         struct inode *inode = file_inode(file);
2361         struct usb_device *dev = ps->dev;
2362         int ret = -ENOTTY;
2363
2364         if (!(file->f_mode & FMODE_WRITE))
2365                 return -EPERM;
2366
2367         usb_lock_device(dev);
2368
2369         /* Reap operations are allowed even after disconnection */
2370         switch (cmd) {
2371         case USBDEVFS_REAPURB:
2372                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2373                 ret = proc_reapurb(ps, p);
2374                 goto done;
2375
2376         case USBDEVFS_REAPURBNDELAY:
2377                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2378                 ret = proc_reapurbnonblock(ps, p);
2379                 goto done;
2380
2381 #ifdef CONFIG_COMPAT
2382         case USBDEVFS_REAPURB32:
2383                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2384                 ret = proc_reapurb_compat(ps, p);
2385                 goto done;
2386
2387         case USBDEVFS_REAPURBNDELAY32:
2388                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2389                 ret = proc_reapurbnonblock_compat(ps, p);
2390                 goto done;
2391 #endif
2392         }
2393
2394         if (!connected(ps)) {
2395                 usb_unlock_device(dev);
2396                 return -ENODEV;
2397         }
2398
2399         switch (cmd) {
2400         case USBDEVFS_CONTROL:
2401                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2402                 ret = proc_control(ps, p);
2403                 if (ret >= 0)
2404                         inode->i_mtime = CURRENT_TIME;
2405                 break;
2406
2407         case USBDEVFS_BULK:
2408                 snoop(&dev->dev, "%s: BULK\n", __func__);
2409                 ret = proc_bulk(ps, p);
2410                 if (ret >= 0)
2411                         inode->i_mtime = CURRENT_TIME;
2412                 break;
2413
2414         case USBDEVFS_RESETEP:
2415                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2416                 ret = proc_resetep(ps, p);
2417                 if (ret >= 0)
2418                         inode->i_mtime = CURRENT_TIME;
2419                 break;
2420
2421         case USBDEVFS_RESET:
2422                 snoop(&dev->dev, "%s: RESET\n", __func__);
2423                 ret = proc_resetdevice(ps);
2424                 break;
2425
2426         case USBDEVFS_CLEAR_HALT:
2427                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2428                 ret = proc_clearhalt(ps, p);
2429                 if (ret >= 0)
2430                         inode->i_mtime = CURRENT_TIME;
2431                 break;
2432
2433         case USBDEVFS_GETDRIVER:
2434                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2435                 ret = proc_getdriver(ps, p);
2436                 break;
2437
2438         case USBDEVFS_CONNECTINFO:
2439                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2440                 ret = proc_connectinfo(ps, p);
2441                 break;
2442
2443         case USBDEVFS_SETINTERFACE:
2444                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2445                 ret = proc_setintf(ps, p);
2446                 break;
2447
2448         case USBDEVFS_SETCONFIGURATION:
2449                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2450                 ret = proc_setconfig(ps, p);
2451                 break;
2452
2453         case USBDEVFS_SUBMITURB:
2454                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2455                 ret = proc_submiturb(ps, p);
2456                 if (ret >= 0)
2457                         inode->i_mtime = CURRENT_TIME;
2458                 break;
2459
2460 #ifdef CONFIG_COMPAT
2461         case USBDEVFS_CONTROL32:
2462                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2463                 ret = proc_control_compat(ps, p);
2464                 if (ret >= 0)
2465                         inode->i_mtime = CURRENT_TIME;
2466                 break;
2467
2468         case USBDEVFS_BULK32:
2469                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2470                 ret = proc_bulk_compat(ps, p);
2471                 if (ret >= 0)
2472                         inode->i_mtime = CURRENT_TIME;
2473                 break;
2474
2475         case USBDEVFS_DISCSIGNAL32:
2476                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2477                 ret = proc_disconnectsignal_compat(ps, p);
2478                 break;
2479
2480         case USBDEVFS_SUBMITURB32:
2481                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2482                 ret = proc_submiturb_compat(ps, p);
2483                 if (ret >= 0)
2484                         inode->i_mtime = CURRENT_TIME;
2485                 break;
2486
2487         case USBDEVFS_IOCTL32:
2488                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2489                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2490                 break;
2491 #endif
2492
2493         case USBDEVFS_DISCARDURB:
2494                 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2495                 ret = proc_unlinkurb(ps, p);
2496                 break;
2497
2498         case USBDEVFS_DISCSIGNAL:
2499                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2500                 ret = proc_disconnectsignal(ps, p);
2501                 break;
2502
2503         case USBDEVFS_CLAIMINTERFACE:
2504                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2505                 ret = proc_claiminterface(ps, p);
2506                 break;
2507
2508         case USBDEVFS_RELEASEINTERFACE:
2509                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2510                 ret = proc_releaseinterface(ps, p);
2511                 break;
2512
2513         case USBDEVFS_IOCTL:
2514                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2515                 ret = proc_ioctl_default(ps, p);
2516                 break;
2517
2518         case USBDEVFS_CLAIM_PORT:
2519                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2520                 ret = proc_claim_port(ps, p);
2521                 break;
2522
2523         case USBDEVFS_RELEASE_PORT:
2524                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2525                 ret = proc_release_port(ps, p);
2526                 break;
2527         case USBDEVFS_GET_CAPABILITIES:
2528                 ret = proc_get_capabilities(ps, p);
2529                 break;
2530         case USBDEVFS_DISCONNECT_CLAIM:
2531                 ret = proc_disconnect_claim(ps, p);
2532                 break;
2533         case USBDEVFS_ALLOC_STREAMS:
2534                 ret = proc_alloc_streams(ps, p);
2535                 break;
2536         case USBDEVFS_FREE_STREAMS:
2537                 ret = proc_free_streams(ps, p);
2538                 break;
2539         case USBDEVFS_DROP_PRIVILEGES:
2540                 ret = proc_drop_privileges(ps, p);
2541                 break;
2542         }
2543
2544  done:
2545         usb_unlock_device(dev);
2546         if (ret >= 0)
2547                 inode->i_atime = CURRENT_TIME;
2548         return ret;
2549 }
2550
2551 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2552                         unsigned long arg)
2553 {
2554         int ret;
2555
2556         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2557
2558         return ret;
2559 }
2560
2561 #ifdef CONFIG_COMPAT
2562 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2563                         unsigned long arg)
2564 {
2565         int ret;
2566
2567         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2568
2569         return ret;
2570 }
2571 #endif
2572
2573 /* No kernel lock - fine */
2574 static unsigned int usbdev_poll(struct file *file,
2575                                 struct poll_table_struct *wait)
2576 {
2577         struct usb_dev_state *ps = file->private_data;
2578         unsigned int mask = 0;
2579
2580         poll_wait(file, &ps->wait, wait);
2581         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2582                 mask |= POLLOUT | POLLWRNORM;
2583         if (!connected(ps))
2584                 mask |= POLLERR | POLLHUP;
2585         return mask;
2586 }
2587
2588 const struct file_operations usbdev_file_operations = {
2589         .owner =          THIS_MODULE,
2590         .llseek =         no_seek_end_llseek,
2591         .read =           usbdev_read,
2592         .poll =           usbdev_poll,
2593         .unlocked_ioctl = usbdev_ioctl,
2594 #ifdef CONFIG_COMPAT
2595         .compat_ioctl =   usbdev_compat_ioctl,
2596 #endif
2597         .mmap =           usbdev_mmap,
2598         .open =           usbdev_open,
2599         .release =        usbdev_release,
2600 };
2601
2602 static void usbdev_remove(struct usb_device *udev)
2603 {
2604         struct usb_dev_state *ps;
2605         struct siginfo sinfo;
2606
2607         while (!list_empty(&udev->filelist)) {
2608                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2609                 destroy_all_async(ps);
2610                 wake_up_all(&ps->wait);
2611                 list_del_init(&ps->list);
2612                 if (ps->discsignr) {
2613                         memset(&sinfo, 0, sizeof(sinfo));
2614                         sinfo.si_signo = ps->discsignr;
2615                         sinfo.si_errno = EPIPE;
2616                         sinfo.si_code = SI_ASYNCIO;
2617                         sinfo.si_addr = ps->disccontext;
2618                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2619                                         ps->disc_pid, ps->cred, ps->secid);
2620                 }
2621         }
2622 }
2623
2624 static int usbdev_notify(struct notifier_block *self,
2625                                unsigned long action, void *dev)
2626 {
2627         switch (action) {
2628         case USB_DEVICE_ADD:
2629                 break;
2630         case USB_DEVICE_REMOVE:
2631                 usbdev_remove(dev);
2632                 break;
2633         }
2634         return NOTIFY_OK;
2635 }
2636
2637 static struct notifier_block usbdev_nb = {
2638         .notifier_call =        usbdev_notify,
2639 };
2640
2641 static struct cdev usb_device_cdev;
2642
2643 int __init usb_devio_init(void)
2644 {
2645         int retval;
2646
2647         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2648                                         "usb_device");
2649         if (retval) {
2650                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2651                 goto out;
2652         }
2653         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2654         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2655         if (retval) {
2656                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2657                        USB_DEVICE_MAJOR);
2658                 goto error_cdev;
2659         }
2660         usb_register_notify(&usbdev_nb);
2661 out:
2662         return retval;
2663
2664 error_cdev:
2665         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2666         goto out;
2667 }
2668
2669 void usb_devio_cleanup(void)
2670 {
2671         usb_unregister_notify(&usbdev_nb);
2672         cdev_del(&usb_device_cdev);
2673         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2674 }