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/IBSS attributes */
  98 IEEE80211_IF_FILE(state, u.sta.state, DEC);
  99 IEEE80211_IF_FILE(bssid, u.sta.bssid, MAC);
 100 IEEE80211_IF_FILE(prev_bssid, u.sta.prev_bssid, MAC);
 101 IEEE80211_IF_FILE(ssid_len, u.sta.ssid_len, SIZE);
 102 IEEE80211_IF_FILE(aid, u.sta.aid, DEC);
 103 IEEE80211_IF_FILE(ap_capab, u.sta.ap_capab, HEX);
 104 IEEE80211_IF_FILE(capab, u.sta.capab, HEX);
 105 IEEE80211_IF_FILE(extra_ie_len, u.sta.extra_ie_len, SIZE);
 106 IEEE80211_IF_FILE(auth_tries, u.sta.auth_tries, DEC);
 107 IEEE80211_IF_FILE(assoc_tries, u.sta.assoc_tries, DEC);
 108 IEEE80211_IF_FILE(auth_algs, u.sta.auth_algs, HEX);
 109 IEEE80211_IF_FILE(auth_alg, u.sta.auth_alg, DEC);
 110 IEEE80211_IF_FILE(auth_transaction, u.sta.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.sta.flags & IEEE80211_STA_SSID_SET ? "SSID\n" : "",
 117                  sdata->u.sta.flags & IEEE80211_STA_BSSID_SET ? "BSSID\n" : "",
 118                  sdata->u.sta.flags & IEEE80211_STA_PREV_BSSID_SET ? "prev BSSID\n" : "",
 119                  sdata->u.sta.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 120                  sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 121                  sdata->u.sta.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         case NL80211_IFTYPE_ADHOC:
 287                 add_sta_files(sdata);
 288                 break;
 289         case NL80211_IFTYPE_AP:
 290                 add_ap_files(sdata);
 291                 break;
 292         case NL80211_IFTYPE_WDS:
 293                 add_wds_files(sdata);
 294                 break;
 295         case NL80211_IFTYPE_MONITOR:
 296                 add_monitor_files(sdata);
 297                 break;
 298         case NL80211_IFTYPE_AP_VLAN:
 299                 add_vlan_files(sdata);
 300                 break;
 301         default:
 302                 break;
 303         }
 304 }
 305
 306 #define DEBUGFS_DEL(name, type)                                 \
 307         do {                                                    \
 308                 debugfs_remove(sdata->debugfs.type.name);       \
 309                 sdata->debugfs.type.name = NULL;                \
 310         } while (0)
 311
 312 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 313 {
 314         DEBUGFS_DEL(drop_unencrypted, sta);
 315         DEBUGFS_DEL(force_unicast_rateidx, sta);
 316         DEBUGFS_DEL(max_ratectrl_rateidx, sta);
 317
 318         DEBUGFS_DEL(state, sta);
 319         DEBUGFS_DEL(bssid, sta);
 320         DEBUGFS_DEL(prev_bssid, sta);
 321         DEBUGFS_DEL(ssid_len, sta);
 322         DEBUGFS_DEL(aid, sta);
 323         DEBUGFS_DEL(ap_capab, sta);
 324         DEBUGFS_DEL(capab, sta);
 325         DEBUGFS_DEL(extra_ie_len, sta);
 326         DEBUGFS_DEL(auth_tries, sta);
 327         DEBUGFS_DEL(assoc_tries, sta);
 328         DEBUGFS_DEL(auth_algs, sta);
 329         DEBUGFS_DEL(auth_alg, sta);
 330         DEBUGFS_DEL(auth_transaction, sta);
 331         DEBUGFS_DEL(flags, sta);
 332 }
 333
 334 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 335 {
 336         DEBUGFS_DEL(drop_unencrypted, ap);
 337         DEBUGFS_DEL(force_unicast_rateidx, ap);
 338         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 339
 340         DEBUGFS_DEL(num_sta_ps, ap);
 341         DEBUGFS_DEL(dtim_count, ap);
 342         DEBUGFS_DEL(num_buffered_multicast, ap);
 343 }
 344
 345 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 346 {
 347         DEBUGFS_DEL(drop_unencrypted, wds);
 348         DEBUGFS_DEL(force_unicast_rateidx, wds);
 349         DEBUGFS_DEL(max_ratectrl_rateidx, wds);
 350
 351         DEBUGFS_DEL(peer, wds);
 352 }
 353
 354 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 355 {
 356         DEBUGFS_DEL(drop_unencrypted, vlan);
 357         DEBUGFS_DEL(force_unicast_rateidx, vlan);
 358         DEBUGFS_DEL(max_ratectrl_rateidx, vlan);
 359 }
 360
 361 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 362 {
 363 }
 364
 365 #ifdef CONFIG_MAC80211_MESH
 366 #define MESHSTATS_DEL(name)                     \
 367         do {                                            \
 368                 debugfs_remove(sdata->mesh_stats.name); \
 369                 sdata->mesh_stats.name = NULL;          \
 370         } while (0)
 371
 372 static void del_mesh_stats(struct ieee80211_sub_if_data *sdata)
 373 {
 374         MESHSTATS_DEL(fwded_frames);
 375         MESHSTATS_DEL(dropped_frames_ttl);
 376         MESHSTATS_DEL(dropped_frames_no_route);
 377         MESHSTATS_DEL(estab_plinks);
 378         debugfs_remove(sdata->mesh_stats_dir);
 379         sdata->mesh_stats_dir = NULL;
 380 }
 381
 382 #define MESHPARAMS_DEL(name)                    \
 383         do {                                            \
 384                 debugfs_remove(sdata->mesh_config.name);        \
 385                 sdata->mesh_config.name = NULL;         \
 386         } while (0)
 387
 388 static void del_mesh_config(struct ieee80211_sub_if_data *sdata)
 389 {
 390         MESHPARAMS_DEL(dot11MeshMaxRetries);
 391         MESHPARAMS_DEL(dot11MeshRetryTimeout);
 392         MESHPARAMS_DEL(dot11MeshConfirmTimeout);
 393         MESHPARAMS_DEL(dot11MeshHoldingTimeout);
 394         MESHPARAMS_DEL(dot11MeshTTL);
 395         MESHPARAMS_DEL(auto_open_plinks);
 396         MESHPARAMS_DEL(dot11MeshMaxPeerLinks);
 397         MESHPARAMS_DEL(dot11MeshHWMPactivePathTimeout);
 398         MESHPARAMS_DEL(dot11MeshHWMPpreqMinInterval);
 399         MESHPARAMS_DEL(dot11MeshHWMPnetDiameterTraversalTime);
 400         MESHPARAMS_DEL(dot11MeshHWMPmaxPREQretries);
 401         MESHPARAMS_DEL(path_refresh_time);
 402         MESHPARAMS_DEL(min_discovery_timeout);
 403         debugfs_remove(sdata->mesh_config_dir);
 404         sdata->mesh_config_dir = NULL;
 405 }
 406 #endif
 407
 408 static void del_files(struct ieee80211_sub_if_data *sdata)
 409 {
 410         if (!sdata->debugfsdir)
 411                 return;
 412
 413         switch (sdata->vif.type) {
 414         case NL80211_IFTYPE_MESH_POINT:
 415 #ifdef CONFIG_MAC80211_MESH
 416                 del_mesh_stats(sdata);
 417                 del_mesh_config(sdata);
 418 #endif
 419                 break;
 420         case NL80211_IFTYPE_STATION:
 421         case NL80211_IFTYPE_ADHOC:
 422                 del_sta_files(sdata);
 423                 break;
 424         case NL80211_IFTYPE_AP:
 425                 del_ap_files(sdata);
 426                 break;
 427         case NL80211_IFTYPE_WDS:
 428                 del_wds_files(sdata);
 429                 break;
 430         case NL80211_IFTYPE_MONITOR:
 431                 del_monitor_files(sdata);
 432                 break;
 433         case NL80211_IFTYPE_AP_VLAN:
 434                 del_vlan_files(sdata);
 435                 break;
 436         default:
 437                 break;
 438         }
 439 }
 440
 441 static int notif_registered;
 442
 443 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 444 {
 445         char buf[10+IFNAMSIZ];
 446
 447         if (!notif_registered)
 448                 return;
 449
 450         sprintf(buf, "netdev:%s", sdata->dev->name);
 451         sdata->debugfsdir = debugfs_create_dir(buf,
 452                 sdata->local->hw.wiphy->debugfsdir);
 453         add_files(sdata);
 454 }
 455
 456 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 457 {
 458         del_files(sdata);
 459         debugfs_remove(sdata->debugfsdir);
 460         sdata->debugfsdir = NULL;
 461 }
 462
 463 static int netdev_notify(struct notifier_block *nb,
 464                          unsigned long state,
 465                          void *ndev)
 466 {
 467         struct net_device *dev = ndev;
 468         struct dentry *dir;
 469         struct ieee80211_sub_if_data *sdata;
 470         char buf[10+IFNAMSIZ];
 471
 472         if (state != NETDEV_CHANGENAME)
 473                 return 0;
 474
 475         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 476                 return 0;
 477
 478         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 479                 return 0;
 480
 481         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 482
 483         dir = sdata->debugfsdir;
 484
 485         if (!dir)
 486                 return 0;
 487
 488         sprintf(buf, "netdev:%s", dev->name);
 489         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 490                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 491                        "dir to %s\n", buf);
 492
 493         return 0;
 494 }
 495
 496 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 497         .notifier_call = netdev_notify,
 498 };
 499
 500 void ieee80211_debugfs_netdev_init(void)
 501 {
 502         int err;
 503
 504         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 505         if (err) {
 506                 printk(KERN_ERR
 507                        "mac80211: failed to install netdev notifier,"
 508                        " disabling per-netdev debugfs!\n");
 509         } else
 510                 notif_registered = 1;
 511 }
 512
 513 void ieee80211_debugfs_netdev_exit(void)
 514 {
 515         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 516         notif_registered = 0;
 517 }