net/mac80211/debugfs_netdev.c

   1 /*
   2  * Copyright (c) 2006   Jiri Benc <jbenc@suse.cz>
   3  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/device.h>
  12 #include <linux/if.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/rtnetlink.h>
  16 #include <linux/notifier.h>
  17 #include <net/mac80211.h>
  18 #include <net/cfg80211.h>
  19 #include "ieee80211_i.h"
  20 #include "rate.h"
  21 #include "debugfs.h"
  22 #include "debugfs_netdev.h"
  23
  24 static ssize_t ieee80211_if_read(
  25         struct ieee80211_sub_if_data *sdata,
  26         char __user *userbuf,
  27         size_t count, loff_t *ppos,
  28         ssize_t (*format)(const struct ieee80211_sub_if_data *, char *, int))
  29 {
  30         char buf[70];
  31         ssize_t ret = -EINVAL;
  32
  33         read_lock(&dev_base_lock);
  34         if (sdata->dev->reg_state == NETREG_REGISTERED)
  35                 ret = (*format)(sdata, buf, sizeof(buf));
  36         read_unlock(&dev_base_lock);
  37
  38         if (ret != -EINVAL)
  39                 ret = simple_read_from_buffer(userbuf, count, ppos, buf, ret);
  40
  41         return ret;
  42 }
  43
  44 #define IEEE80211_IF_FMT(name, field, format_string)                    \
  45 static ssize_t ieee80211_if_fmt_##name(                                 \
  46         const struct ieee80211_sub_if_data *sdata, char *buf,           \
  47         int buflen)                                                     \
  48 {                                                                       \
  49         return scnprintf(buf, buflen, format_string, sdata->field);     \
  50 }
  51 #define IEEE80211_IF_FMT_DEC(name, field)                               \
  52                 IEEE80211_IF_FMT(name, field, "%d\n")
  53 #define IEEE80211_IF_FMT_HEX(name, field)                               \
  54                 IEEE80211_IF_FMT(name, field, "%#x\n")
  55 #define IEEE80211_IF_FMT_SIZE(name, field)                              \
  56                 IEEE80211_IF_FMT(name, field, "%zd\n")
  57
  58 #define IEEE80211_IF_FMT_ATOMIC(name, field)                            \
  59 static ssize_t ieee80211_if_fmt_##name(                                 \
  60         const struct ieee80211_sub_if_data *sdata,                      \
  61         char *buf, int buflen)                                          \
  62 {                                                                       \
  63         return scnprintf(buf, buflen, "%d\n", atomic_read(&sdata->field));\
  64 }
  65
  66 #define IEEE80211_IF_FMT_MAC(name, field)                               \
  67 static ssize_t ieee80211_if_fmt_##name(                                 \
  68         const struct ieee80211_sub_if_data *sdata, char *buf,           \
  69         int buflen)                                                     \
  70 {                                                                       \
  71         return scnprintf(buf, buflen, "%pM\n", sdata->field);           \
  72 }
  73
  74 #define __IEEE80211_IF_FILE(name)                                       \
  75 static ssize_t ieee80211_if_read_##name(struct file *file,              \
  76                                         char __user *userbuf,           \
  77                                         size_t count, loff_t *ppos)     \
  78 {                                                                       \
  79         return ieee80211_if_read(file->private_data,                    \
  80                                  userbuf, count, ppos,                  \
  81                                  ieee80211_if_fmt_##name);              \
  82 }                                                                       \
  83 static const struct file_operations name##_ops = {                      \
  84         .read = ieee80211_if_read_##name,                               \
  85         .open = mac80211_open_file_generic,                             \
  86 }
  87
  88 #define IEEE80211_IF_FILE(name, field, format)                          \
  89                 IEEE80211_IF_FMT_##format(name, field)                  \
  90                 __IEEE80211_IF_FILE(name)
  91
  92 /* common attributes */
  93 IEEE80211_IF_FILE(drop_unencrypted, drop_unencrypted, DEC);
  94 IEEE80211_IF_FILE(force_unicast_rateidx, force_unicast_rateidx, DEC);
  95 IEEE80211_IF_FILE(max_ratectrl_rateidx, max_ratectrl_rateidx, DEC);
  96
  97 /* STA attributes */
  98 IEEE80211_IF_FILE(state, u.mgd.state, DEC);
  99 IEEE80211_IF_FILE(bssid, u.mgd.bssid, MAC);
 100 IEEE80211_IF_FILE(prev_bssid, u.mgd.prev_bssid, MAC);
 101 IEEE80211_IF_FILE(ssid_len, u.mgd.ssid_len, SIZE);
 102 IEEE80211_IF_FILE(aid, u.mgd.aid, DEC);
 103 IEEE80211_IF_FILE(ap_capab, u.mgd.ap_capab, HEX);
 104 IEEE80211_IF_FILE(capab, u.mgd.capab, HEX);
 105 IEEE80211_IF_FILE(extra_ie_len, u.mgd.extra_ie_len, SIZE);
 106 IEEE80211_IF_FILE(auth_tries, u.mgd.auth_tries, DEC);
 107 IEEE80211_IF_FILE(assoc_tries, u.mgd.assoc_tries, DEC);
 108 IEEE80211_IF_FILE(auth_algs, u.mgd.auth_algs, HEX);
 109 IEEE80211_IF_FILE(auth_alg, u.mgd.auth_alg, DEC);
 110 IEEE80211_IF_FILE(auth_transaction, u.mgd.auth_transaction, DEC);
 111
 112 static ssize_t ieee80211_if_fmt_flags(
 113         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 114 {
 115         return scnprintf(buf, buflen, "%s%s%s%s%s%s%s\n",
 116                  sdata->u.mgd.flags & IEEE80211_STA_SSID_SET ? "SSID\n" : "",
 117                  sdata->u.mgd.flags & IEEE80211_STA_BSSID_SET ? "BSSID\n" : "",
 118                  sdata->u.mgd.flags & IEEE80211_STA_PREV_BSSID_SET ? "prev BSSID\n" : "",
 119                  sdata->u.mgd.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 120                  sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 121                  sdata->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL ? "PROBEREQ POLL\n" : "",
 122                  sdata->vif.bss_conf.use_cts_prot ? "CTS prot\n" : "");
 123 }
 124 __IEEE80211_IF_FILE(flags);
 125
 126 /* AP attributes */
 127 IEEE80211_IF_FILE(num_sta_ps, u.ap.num_sta_ps, ATOMIC);
 128 IEEE80211_IF_FILE(dtim_count, u.ap.dtim_count, DEC);
 129
 130 static ssize_t ieee80211_if_fmt_num_buffered_multicast(
 131         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 132 {
 133         return scnprintf(buf, buflen, "%u\n",
 134                          skb_queue_len(&sdata->u.ap.ps_bc_buf));
 135 }
 136 __IEEE80211_IF_FILE(num_buffered_multicast);
 137
 138 /* WDS attributes */
 139 IEEE80211_IF_FILE(peer, u.wds.remote_addr, MAC);
 140
 141 #ifdef CONFIG_MAC80211_MESH
 142 /* Mesh stats attributes */
 143 IEEE80211_IF_FILE(fwded_frames, u.mesh.mshstats.fwded_frames, DEC);
 144 IEEE80211_IF_FILE(dropped_frames_ttl, u.mesh.mshstats.dropped_frames_ttl, DEC);
 145 IEEE80211_IF_FILE(dropped_frames_no_route,
 146                 u.mesh.mshstats.dropped_frames_no_route, DEC);
 147 IEEE80211_IF_FILE(estab_plinks, u.mesh.mshstats.estab_plinks, ATOMIC);
 148
 149 /* Mesh parameters */
 150 IEEE80211_IF_FILE(dot11MeshMaxRetries,
 151                 u.mesh.mshcfg.dot11MeshMaxRetries, DEC);
 152 IEEE80211_IF_FILE(dot11MeshRetryTimeout,
 153                 u.mesh.mshcfg.dot11MeshRetryTimeout, DEC);
 154 IEEE80211_IF_FILE(dot11MeshConfirmTimeout,
 155                 u.mesh.mshcfg.dot11MeshConfirmTimeout, DEC);
 156 IEEE80211_IF_FILE(dot11MeshHoldingTimeout,
 157                 u.mesh.mshcfg.dot11MeshHoldingTimeout, DEC);
 158 IEEE80211_IF_FILE(dot11MeshTTL, u.mesh.mshcfg.dot11MeshTTL, DEC);
 159 IEEE80211_IF_FILE(auto_open_plinks, u.mesh.mshcfg.auto_open_plinks, DEC);
 160 IEEE80211_IF_FILE(dot11MeshMaxPeerLinks,
 161                 u.mesh.mshcfg.dot11MeshMaxPeerLinks, DEC);
 162 IEEE80211_IF_FILE(dot11MeshHWMPactivePathTimeout,
 163                 u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout, DEC);
 164 IEEE80211_IF_FILE(dot11MeshHWMPpreqMinInterval,
 165                 u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval, DEC);
 166 IEEE80211_IF_FILE(dot11MeshHWMPnetDiameterTraversalTime,
 167                 u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime, DEC);
 168 IEEE80211_IF_FILE(dot11MeshHWMPmaxPREQretries,
 169                 u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries, DEC);
 170 IEEE80211_IF_FILE(path_refresh_time,
 171                 u.mesh.mshcfg.path_refresh_time, DEC);
 172 IEEE80211_IF_FILE(min_discovery_timeout,
 173                 u.mesh.mshcfg.min_discovery_timeout, DEC);
 174 #endif
 175
 176
 177 #define DEBUGFS_ADD(name, type)\
 178         sdata->debugfs.type.name = debugfs_create_file(#name, 0400,\
 179                 sdata->debugfsdir, sdata, &name##_ops);
 180
 181 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 182 {
 183         DEBUGFS_ADD(drop_unencrypted, sta);
 184         DEBUGFS_ADD(force_unicast_rateidx, sta);
 185         DEBUGFS_ADD(max_ratectrl_rateidx, sta);
 186
 187         DEBUGFS_ADD(state, sta);
 188         DEBUGFS_ADD(bssid, sta);
 189         DEBUGFS_ADD(prev_bssid, sta);
 190         DEBUGFS_ADD(ssid_len, sta);
 191         DEBUGFS_ADD(aid, sta);
 192         DEBUGFS_ADD(ap_capab, sta);
 193         DEBUGFS_ADD(capab, sta);
 194         DEBUGFS_ADD(extra_ie_len, sta);
 195         DEBUGFS_ADD(auth_tries, sta);
 196         DEBUGFS_ADD(assoc_tries, sta);
 197         DEBUGFS_ADD(auth_algs, sta);
 198         DEBUGFS_ADD(auth_alg, sta);
 199         DEBUGFS_ADD(auth_transaction, sta);
 200         DEBUGFS_ADD(flags, sta);
 201 }
 202
 203 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 204 {
 205         DEBUGFS_ADD(drop_unencrypted, ap);
 206         DEBUGFS_ADD(force_unicast_rateidx, ap);
 207         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 208
 209         DEBUGFS_ADD(num_sta_ps, ap);
 210         DEBUGFS_ADD(dtim_count, ap);
 211         DEBUGFS_ADD(num_buffered_multicast, ap);
 212 }
 213
 214 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 215 {
 216         DEBUGFS_ADD(drop_unencrypted, wds);
 217         DEBUGFS_ADD(force_unicast_rateidx, wds);
 218         DEBUGFS_ADD(max_ratectrl_rateidx, wds);
 219
 220         DEBUGFS_ADD(peer, wds);
 221 }
 222
 223 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 224 {
 225         DEBUGFS_ADD(drop_unencrypted, vlan);
 226         DEBUGFS_ADD(force_unicast_rateidx, vlan);
 227         DEBUGFS_ADD(max_ratectrl_rateidx, vlan);
 228 }
 229
 230 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 231 {
 232 }
 233
 234 #ifdef CONFIG_MAC80211_MESH
 235 #define MESHSTATS_ADD(name)\
 236         sdata->mesh_stats.name = debugfs_create_file(#name, 0400,\
 237                 sdata->mesh_stats_dir, sdata, &name##_ops);
 238
 239 static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
 240 {
 241         sdata->mesh_stats_dir = debugfs_create_dir("mesh_stats",
 242                                 sdata->debugfsdir);
 243         MESHSTATS_ADD(fwded_frames);
 244         MESHSTATS_ADD(dropped_frames_ttl);
 245         MESHSTATS_ADD(dropped_frames_no_route);
 246         MESHSTATS_ADD(estab_plinks);
 247 }
 248
 249 #define MESHPARAMS_ADD(name)\
 250         sdata->mesh_config.name = debugfs_create_file(#name, 0600,\
 251                 sdata->mesh_config_dir, sdata, &name##_ops);
 252
 253 static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
 254 {
 255         sdata->mesh_config_dir = debugfs_create_dir("mesh_config",
 256                                 sdata->debugfsdir);
 257         MESHPARAMS_ADD(dot11MeshMaxRetries);
 258         MESHPARAMS_ADD(dot11MeshRetryTimeout);
 259         MESHPARAMS_ADD(dot11MeshConfirmTimeout);
 260         MESHPARAMS_ADD(dot11MeshHoldingTimeout);
 261         MESHPARAMS_ADD(dot11MeshTTL);
 262         MESHPARAMS_ADD(auto_open_plinks);
 263         MESHPARAMS_ADD(dot11MeshMaxPeerLinks);
 264         MESHPARAMS_ADD(dot11MeshHWMPactivePathTimeout);
 265         MESHPARAMS_ADD(dot11MeshHWMPpreqMinInterval);
 266         MESHPARAMS_ADD(dot11MeshHWMPnetDiameterTraversalTime);
 267         MESHPARAMS_ADD(dot11MeshHWMPmaxPREQretries);
 268         MESHPARAMS_ADD(path_refresh_time);
 269         MESHPARAMS_ADD(min_discovery_timeout);
 270 }
 271 #endif
 272
 273 static void add_files(struct ieee80211_sub_if_data *sdata)
 274 {
 275         if (!sdata->debugfsdir)
 276                 return;
 277
 278         switch (sdata->vif.type) {
 279         case NL80211_IFTYPE_MESH_POINT:
 280 #ifdef CONFIG_MAC80211_MESH
 281                 add_mesh_stats(sdata);
 282                 add_mesh_config(sdata);
 283 #endif
 284                 break;
 285         case NL80211_IFTYPE_STATION:
 286                 add_sta_files(sdata);
 287                 break;
 288         case NL80211_IFTYPE_ADHOC:
 289                 /* XXX */
 290                 break;
 291         case NL80211_IFTYPE_AP:
 292                 add_ap_files(sdata);
 293                 break;
 294         case NL80211_IFTYPE_WDS:
 295                 add_wds_files(sdata);
 296                 break;
 297         case NL80211_IFTYPE_MONITOR:
 298                 add_monitor_files(sdata);
 299                 break;
 300         case NL80211_IFTYPE_AP_VLAN:
 301                 add_vlan_files(sdata);
 302                 break;
 303         default:
 304                 break;
 305         }
 306 }
 307
 308 #define DEBUGFS_DEL(name, type)                                 \
 309         do {                                                    \
 310                 debugfs_remove(sdata->debugfs.type.name);       \
 311                 sdata->debugfs.type.name = NULL;                \
 312         } while (0)
 313
 314 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 315 {
 316         DEBUGFS_DEL(drop_unencrypted, sta);
 317         DEBUGFS_DEL(force_unicast_rateidx, sta);
 318         DEBUGFS_DEL(max_ratectrl_rateidx, sta);
 319
 320         DEBUGFS_DEL(state, sta);
 321         DEBUGFS_DEL(bssid, sta);
 322         DEBUGFS_DEL(prev_bssid, sta);
 323         DEBUGFS_DEL(ssid_len, sta);
 324         DEBUGFS_DEL(aid, sta);
 325         DEBUGFS_DEL(ap_capab, sta);
 326         DEBUGFS_DEL(capab, sta);
 327         DEBUGFS_DEL(extra_ie_len, sta);
 328         DEBUGFS_DEL(auth_tries, sta);
 329         DEBUGFS_DEL(assoc_tries, sta);
 330         DEBUGFS_DEL(auth_algs, sta);
 331         DEBUGFS_DEL(auth_alg, sta);
 332         DEBUGFS_DEL(auth_transaction, sta);
 333         DEBUGFS_DEL(flags, sta);
 334 }
 335
 336 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 337 {
 338         DEBUGFS_DEL(drop_unencrypted, ap);
 339         DEBUGFS_DEL(force_unicast_rateidx, ap);
 340         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 341
 342         DEBUGFS_DEL(num_sta_ps, ap);
 343         DEBUGFS_DEL(dtim_count, ap);
 344         DEBUGFS_DEL(num_buffered_multicast, ap);
 345 }
 346
 347 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 348 {
 349         DEBUGFS_DEL(drop_unencrypted, wds);
 350         DEBUGFS_DEL(force_unicast_rateidx, wds);
 351         DEBUGFS_DEL(max_ratectrl_rateidx, wds);
 352
 353         DEBUGFS_DEL(peer, wds);
 354 }
 355
 356 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 357 {
 358         DEBUGFS_DEL(drop_unencrypted, vlan);
 359         DEBUGFS_DEL(force_unicast_rateidx, vlan);
 360         DEBUGFS_DEL(max_ratectrl_rateidx, vlan);
 361 }
 362
 363 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 364 {
 365 }
 366
 367 #ifdef CONFIG_MAC80211_MESH
 368 #define MESHSTATS_DEL(name)                     \
 369         do {                                            \
 370                 debugfs_remove(sdata->mesh_stats.name); \
 371                 sdata->mesh_stats.name = NULL;          \
 372         } while (0)
 373
 374 static void del_mesh_stats(struct ieee80211_sub_if_data *sdata)
 375 {
 376         MESHSTATS_DEL(fwded_frames);
 377         MESHSTATS_DEL(dropped_frames_ttl);
 378         MESHSTATS_DEL(dropped_frames_no_route);
 379         MESHSTATS_DEL(estab_plinks);
 380         debugfs_remove(sdata->mesh_stats_dir);
 381         sdata->mesh_stats_dir = NULL;
 382 }
 383
 384 #define MESHPARAMS_DEL(name)                    \
 385         do {                                            \
 386                 debugfs_remove(sdata->mesh_config.name);        \
 387                 sdata->mesh_config.name = NULL;         \
 388         } while (0)
 389
 390 static void del_mesh_config(struct ieee80211_sub_if_data *sdata)
 391 {
 392         MESHPARAMS_DEL(dot11MeshMaxRetries);
 393         MESHPARAMS_DEL(dot11MeshRetryTimeout);
 394         MESHPARAMS_DEL(dot11MeshConfirmTimeout);
 395         MESHPARAMS_DEL(dot11MeshHoldingTimeout);
 396         MESHPARAMS_DEL(dot11MeshTTL);
 397         MESHPARAMS_DEL(auto_open_plinks);
 398         MESHPARAMS_DEL(dot11MeshMaxPeerLinks);
 399         MESHPARAMS_DEL(dot11MeshHWMPactivePathTimeout);
 400         MESHPARAMS_DEL(dot11MeshHWMPpreqMinInterval);
 401         MESHPARAMS_DEL(dot11MeshHWMPnetDiameterTraversalTime);
 402         MESHPARAMS_DEL(dot11MeshHWMPmaxPREQretries);
 403         MESHPARAMS_DEL(path_refresh_time);
 404         MESHPARAMS_DEL(min_discovery_timeout);
 405         debugfs_remove(sdata->mesh_config_dir);
 406         sdata->mesh_config_dir = NULL;
 407 }
 408 #endif
 409
 410 static void del_files(struct ieee80211_sub_if_data *sdata)
 411 {
 412         if (!sdata->debugfsdir)
 413                 return;
 414
 415         switch (sdata->vif.type) {
 416         case NL80211_IFTYPE_MESH_POINT:
 417 #ifdef CONFIG_MAC80211_MESH
 418                 del_mesh_stats(sdata);
 419                 del_mesh_config(sdata);
 420 #endif
 421                 break;
 422         case NL80211_IFTYPE_STATION:
 423                 del_sta_files(sdata);
 424                 break;
 425         case NL80211_IFTYPE_ADHOC:
 426                 /* XXX */
 427                 break;
 428         case NL80211_IFTYPE_AP:
 429                 del_ap_files(sdata);
 430                 break;
 431         case NL80211_IFTYPE_WDS:
 432                 del_wds_files(sdata);
 433                 break;
 434         case NL80211_IFTYPE_MONITOR:
 435                 del_monitor_files(sdata);
 436                 break;
 437         case NL80211_IFTYPE_AP_VLAN:
 438                 del_vlan_files(sdata);
 439                 break;
 440         default:
 441                 break;
 442         }
 443 }
 444
 445 static int notif_registered;
 446
 447 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 448 {
 449         char buf[10+IFNAMSIZ];
 450
 451         if (!notif_registered)
 452                 return;
 453
 454         sprintf(buf, "netdev:%s", sdata->dev->name);
 455         sdata->debugfsdir = debugfs_create_dir(buf,
 456                 sdata->local->hw.wiphy->debugfsdir);
 457         add_files(sdata);
 458 }
 459
 460 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 461 {
 462         del_files(sdata);
 463         debugfs_remove(sdata->debugfsdir);
 464         sdata->debugfsdir = NULL;
 465 }
 466
 467 static int netdev_notify(struct notifier_block *nb,
 468                          unsigned long state,
 469                          void *ndev)
 470 {
 471         struct net_device *dev = ndev;
 472         struct dentry *dir;
 473         struct ieee80211_sub_if_data *sdata;
 474         char buf[10+IFNAMSIZ];
 475
 476         if (state != NETDEV_CHANGENAME)
 477                 return 0;
 478
 479         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 480                 return 0;
 481
 482         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 483                 return 0;
 484
 485         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 486
 487         dir = sdata->debugfsdir;
 488
 489         if (!dir)
 490                 return 0;
 491
 492         sprintf(buf, "netdev:%s", dev->name);
 493         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 494                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 495                        "dir to %s\n", buf);
 496
 497         return 0;
 498 }
 499
 500 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 501         .notifier_call = netdev_notify,
 502 };
 503
 504 void ieee80211_debugfs_netdev_init(void)
 505 {
 506         int err;
 507
 508         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 509         if (err) {
 510                 printk(KERN_ERR
 511                        "mac80211: failed to install netdev notifier,"
 512                        " disabling per-netdev debugfs!\n");
 513         } else
 514                 notif_registered = 1;
 515 }
 516
 517 void ieee80211_debugfs_netdev_exit(void)
 518 {
 519         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 520         notif_registered = 0;
 521 }