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