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_alg, u.mgd.auth_alg, DEC);
 109 IEEE80211_IF_FILE(auth_transaction, u.mgd.auth_transaction, DEC);
 110
 111 static ssize_t ieee80211_if_fmt_flags(
 112         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 113 {
 114         return scnprintf(buf, buflen, "%s%s%s%s%s\n",
 115                  sdata->u.mgd.flags & IEEE80211_STA_PREV_BSSID_SET ? "prev BSSID\n" : "",
 116                  sdata->u.mgd.flags & IEEE80211_STA_AUTHENTICATED ? "AUTH\n" : "",
 117                  sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED ? "ASSOC\n" : "",
 118                  sdata->u.mgd.flags & IEEE80211_STA_PROBEREQ_POLL ? "PROBEREQ POLL\n" : "",
 119                  sdata->vif.bss_conf.use_cts_prot ? "CTS prot\n" : "");
 120 }
 121 __IEEE80211_IF_FILE(flags);
 122
 123 /* AP attributes */
 124 IEEE80211_IF_FILE(num_sta_ps, u.ap.num_sta_ps, ATOMIC);
 125 IEEE80211_IF_FILE(dtim_count, u.ap.dtim_count, DEC);
 126
 127 static ssize_t ieee80211_if_fmt_num_buffered_multicast(
 128         const struct ieee80211_sub_if_data *sdata, char *buf, int buflen)
 129 {
 130         return scnprintf(buf, buflen, "%u\n",
 131                          skb_queue_len(&sdata->u.ap.ps_bc_buf));
 132 }
 133 __IEEE80211_IF_FILE(num_buffered_multicast);
 134
 135 /* WDS attributes */
 136 IEEE80211_IF_FILE(peer, u.wds.remote_addr, MAC);
 137
 138 #ifdef CONFIG_MAC80211_MESH
 139 /* Mesh stats attributes */
 140 IEEE80211_IF_FILE(fwded_frames, u.mesh.mshstats.fwded_frames, DEC);
 141 IEEE80211_IF_FILE(dropped_frames_ttl, u.mesh.mshstats.dropped_frames_ttl, DEC);
 142 IEEE80211_IF_FILE(dropped_frames_no_route,
 143                 u.mesh.mshstats.dropped_frames_no_route, DEC);
 144 IEEE80211_IF_FILE(estab_plinks, u.mesh.mshstats.estab_plinks, ATOMIC);
 145
 146 /* Mesh parameters */
 147 IEEE80211_IF_FILE(dot11MeshMaxRetries,
 148                 u.mesh.mshcfg.dot11MeshMaxRetries, DEC);
 149 IEEE80211_IF_FILE(dot11MeshRetryTimeout,
 150                 u.mesh.mshcfg.dot11MeshRetryTimeout, DEC);
 151 IEEE80211_IF_FILE(dot11MeshConfirmTimeout,
 152                 u.mesh.mshcfg.dot11MeshConfirmTimeout, DEC);
 153 IEEE80211_IF_FILE(dot11MeshHoldingTimeout,
 154                 u.mesh.mshcfg.dot11MeshHoldingTimeout, DEC);
 155 IEEE80211_IF_FILE(dot11MeshTTL, u.mesh.mshcfg.dot11MeshTTL, DEC);
 156 IEEE80211_IF_FILE(auto_open_plinks, u.mesh.mshcfg.auto_open_plinks, DEC);
 157 IEEE80211_IF_FILE(dot11MeshMaxPeerLinks,
 158                 u.mesh.mshcfg.dot11MeshMaxPeerLinks, DEC);
 159 IEEE80211_IF_FILE(dot11MeshHWMPactivePathTimeout,
 160                 u.mesh.mshcfg.dot11MeshHWMPactivePathTimeout, DEC);
 161 IEEE80211_IF_FILE(dot11MeshHWMPpreqMinInterval,
 162                 u.mesh.mshcfg.dot11MeshHWMPpreqMinInterval, DEC);
 163 IEEE80211_IF_FILE(dot11MeshHWMPnetDiameterTraversalTime,
 164                 u.mesh.mshcfg.dot11MeshHWMPnetDiameterTraversalTime, DEC);
 165 IEEE80211_IF_FILE(dot11MeshHWMPmaxPREQretries,
 166                 u.mesh.mshcfg.dot11MeshHWMPmaxPREQretries, DEC);
 167 IEEE80211_IF_FILE(path_refresh_time,
 168                 u.mesh.mshcfg.path_refresh_time, DEC);
 169 IEEE80211_IF_FILE(min_discovery_timeout,
 170                 u.mesh.mshcfg.min_discovery_timeout, DEC);
 171 #endif
 172
 173
 174 #define DEBUGFS_ADD(name, type)\
 175         sdata->debugfs.type.name = debugfs_create_file(#name, 0400,\
 176                 sdata->debugfsdir, sdata, &name##_ops);
 177
 178 static void add_sta_files(struct ieee80211_sub_if_data *sdata)
 179 {
 180         DEBUGFS_ADD(drop_unencrypted, sta);
 181         DEBUGFS_ADD(force_unicast_rateidx, sta);
 182         DEBUGFS_ADD(max_ratectrl_rateidx, sta);
 183
 184         DEBUGFS_ADD(state, sta);
 185         DEBUGFS_ADD(bssid, sta);
 186         DEBUGFS_ADD(prev_bssid, sta);
 187         DEBUGFS_ADD(ssid_len, sta);
 188         DEBUGFS_ADD(aid, sta);
 189         DEBUGFS_ADD(ap_capab, sta);
 190         DEBUGFS_ADD(capab, sta);
 191         DEBUGFS_ADD(extra_ie_len, sta);
 192         DEBUGFS_ADD(auth_tries, sta);
 193         DEBUGFS_ADD(assoc_tries, sta);
 194         DEBUGFS_ADD(auth_alg, sta);
 195         DEBUGFS_ADD(auth_transaction, sta);
 196         DEBUGFS_ADD(flags, sta);
 197 }
 198
 199 static void add_ap_files(struct ieee80211_sub_if_data *sdata)
 200 {
 201         DEBUGFS_ADD(drop_unencrypted, ap);
 202         DEBUGFS_ADD(force_unicast_rateidx, ap);
 203         DEBUGFS_ADD(max_ratectrl_rateidx, ap);
 204
 205         DEBUGFS_ADD(num_sta_ps, ap);
 206         DEBUGFS_ADD(dtim_count, ap);
 207         DEBUGFS_ADD(num_buffered_multicast, ap);
 208 }
 209
 210 static void add_wds_files(struct ieee80211_sub_if_data *sdata)
 211 {
 212         DEBUGFS_ADD(drop_unencrypted, wds);
 213         DEBUGFS_ADD(force_unicast_rateidx, wds);
 214         DEBUGFS_ADD(max_ratectrl_rateidx, wds);
 215
 216         DEBUGFS_ADD(peer, wds);
 217 }
 218
 219 static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
 220 {
 221         DEBUGFS_ADD(drop_unencrypted, vlan);
 222         DEBUGFS_ADD(force_unicast_rateidx, vlan);
 223         DEBUGFS_ADD(max_ratectrl_rateidx, vlan);
 224 }
 225
 226 static void add_monitor_files(struct ieee80211_sub_if_data *sdata)
 227 {
 228 }
 229
 230 #ifdef CONFIG_MAC80211_MESH
 231 #define MESHSTATS_ADD(name)\
 232         sdata->mesh_stats.name = debugfs_create_file(#name, 0400,\
 233                 sdata->mesh_stats_dir, sdata, &name##_ops);
 234
 235 static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
 236 {
 237         sdata->mesh_stats_dir = debugfs_create_dir("mesh_stats",
 238                                 sdata->debugfsdir);
 239         MESHSTATS_ADD(fwded_frames);
 240         MESHSTATS_ADD(dropped_frames_ttl);
 241         MESHSTATS_ADD(dropped_frames_no_route);
 242         MESHSTATS_ADD(estab_plinks);
 243 }
 244
 245 #define MESHPARAMS_ADD(name)\
 246         sdata->mesh_config.name = debugfs_create_file(#name, 0600,\
 247                 sdata->mesh_config_dir, sdata, &name##_ops);
 248
 249 static void add_mesh_config(struct ieee80211_sub_if_data *sdata)
 250 {
 251         sdata->mesh_config_dir = debugfs_create_dir("mesh_config",
 252                                 sdata->debugfsdir);
 253         MESHPARAMS_ADD(dot11MeshMaxRetries);
 254         MESHPARAMS_ADD(dot11MeshRetryTimeout);
 255         MESHPARAMS_ADD(dot11MeshConfirmTimeout);
 256         MESHPARAMS_ADD(dot11MeshHoldingTimeout);
 257         MESHPARAMS_ADD(dot11MeshTTL);
 258         MESHPARAMS_ADD(auto_open_plinks);
 259         MESHPARAMS_ADD(dot11MeshMaxPeerLinks);
 260         MESHPARAMS_ADD(dot11MeshHWMPactivePathTimeout);
 261         MESHPARAMS_ADD(dot11MeshHWMPpreqMinInterval);
 262         MESHPARAMS_ADD(dot11MeshHWMPnetDiameterTraversalTime);
 263         MESHPARAMS_ADD(dot11MeshHWMPmaxPREQretries);
 264         MESHPARAMS_ADD(path_refresh_time);
 265         MESHPARAMS_ADD(min_discovery_timeout);
 266 }
 267 #endif
 268
 269 static void add_files(struct ieee80211_sub_if_data *sdata)
 270 {
 271         if (!sdata->debugfsdir)
 272                 return;
 273
 274         switch (sdata->vif.type) {
 275         case NL80211_IFTYPE_MESH_POINT:
 276 #ifdef CONFIG_MAC80211_MESH
 277                 add_mesh_stats(sdata);
 278                 add_mesh_config(sdata);
 279 #endif
 280                 break;
 281         case NL80211_IFTYPE_STATION:
 282                 add_sta_files(sdata);
 283                 break;
 284         case NL80211_IFTYPE_ADHOC:
 285                 /* XXX */
 286                 break;
 287         case NL80211_IFTYPE_AP:
 288                 add_ap_files(sdata);
 289                 break;
 290         case NL80211_IFTYPE_WDS:
 291                 add_wds_files(sdata);
 292                 break;
 293         case NL80211_IFTYPE_MONITOR:
 294                 add_monitor_files(sdata);
 295                 break;
 296         case NL80211_IFTYPE_AP_VLAN:
 297                 add_vlan_files(sdata);
 298                 break;
 299         default:
 300                 break;
 301         }
 302 }
 303
 304 #define DEBUGFS_DEL(name, type)                                 \
 305         do {                                                    \
 306                 debugfs_remove(sdata->debugfs.type.name);       \
 307                 sdata->debugfs.type.name = NULL;                \
 308         } while (0)
 309
 310 static void del_sta_files(struct ieee80211_sub_if_data *sdata)
 311 {
 312         DEBUGFS_DEL(drop_unencrypted, sta);
 313         DEBUGFS_DEL(force_unicast_rateidx, sta);
 314         DEBUGFS_DEL(max_ratectrl_rateidx, sta);
 315
 316         DEBUGFS_DEL(state, sta);
 317         DEBUGFS_DEL(bssid, sta);
 318         DEBUGFS_DEL(prev_bssid, sta);
 319         DEBUGFS_DEL(ssid_len, sta);
 320         DEBUGFS_DEL(aid, sta);
 321         DEBUGFS_DEL(ap_capab, sta);
 322         DEBUGFS_DEL(capab, sta);
 323         DEBUGFS_DEL(extra_ie_len, sta);
 324         DEBUGFS_DEL(auth_tries, sta);
 325         DEBUGFS_DEL(assoc_tries, sta);
 326         DEBUGFS_DEL(auth_alg, sta);
 327         DEBUGFS_DEL(auth_transaction, sta);
 328         DEBUGFS_DEL(flags, sta);
 329 }
 330
 331 static void del_ap_files(struct ieee80211_sub_if_data *sdata)
 332 {
 333         DEBUGFS_DEL(drop_unencrypted, ap);
 334         DEBUGFS_DEL(force_unicast_rateidx, ap);
 335         DEBUGFS_DEL(max_ratectrl_rateidx, ap);
 336
 337         DEBUGFS_DEL(num_sta_ps, ap);
 338         DEBUGFS_DEL(dtim_count, ap);
 339         DEBUGFS_DEL(num_buffered_multicast, ap);
 340 }
 341
 342 static void del_wds_files(struct ieee80211_sub_if_data *sdata)
 343 {
 344         DEBUGFS_DEL(drop_unencrypted, wds);
 345         DEBUGFS_DEL(force_unicast_rateidx, wds);
 346         DEBUGFS_DEL(max_ratectrl_rateidx, wds);
 347
 348         DEBUGFS_DEL(peer, wds);
 349 }
 350
 351 static void del_vlan_files(struct ieee80211_sub_if_data *sdata)
 352 {
 353         DEBUGFS_DEL(drop_unencrypted, vlan);
 354         DEBUGFS_DEL(force_unicast_rateidx, vlan);
 355         DEBUGFS_DEL(max_ratectrl_rateidx, vlan);
 356 }
 357
 358 static void del_monitor_files(struct ieee80211_sub_if_data *sdata)
 359 {
 360 }
 361
 362 #ifdef CONFIG_MAC80211_MESH
 363 #define MESHSTATS_DEL(name)                     \
 364         do {                                            \
 365                 debugfs_remove(sdata->mesh_stats.name); \
 366                 sdata->mesh_stats.name = NULL;          \
 367         } while (0)
 368
 369 static void del_mesh_stats(struct ieee80211_sub_if_data *sdata)
 370 {
 371         MESHSTATS_DEL(fwded_frames);
 372         MESHSTATS_DEL(dropped_frames_ttl);
 373         MESHSTATS_DEL(dropped_frames_no_route);
 374         MESHSTATS_DEL(estab_plinks);
 375         debugfs_remove(sdata->mesh_stats_dir);
 376         sdata->mesh_stats_dir = NULL;
 377 }
 378
 379 #define MESHPARAMS_DEL(name)                    \
 380         do {                                            \
 381                 debugfs_remove(sdata->mesh_config.name);        \
 382                 sdata->mesh_config.name = NULL;         \
 383         } while (0)
 384
 385 static void del_mesh_config(struct ieee80211_sub_if_data *sdata)
 386 {
 387         MESHPARAMS_DEL(dot11MeshMaxRetries);
 388         MESHPARAMS_DEL(dot11MeshRetryTimeout);
 389         MESHPARAMS_DEL(dot11MeshConfirmTimeout);
 390         MESHPARAMS_DEL(dot11MeshHoldingTimeout);
 391         MESHPARAMS_DEL(dot11MeshTTL);
 392         MESHPARAMS_DEL(auto_open_plinks);
 393         MESHPARAMS_DEL(dot11MeshMaxPeerLinks);
 394         MESHPARAMS_DEL(dot11MeshHWMPactivePathTimeout);
 395         MESHPARAMS_DEL(dot11MeshHWMPpreqMinInterval);
 396         MESHPARAMS_DEL(dot11MeshHWMPnetDiameterTraversalTime);
 397         MESHPARAMS_DEL(dot11MeshHWMPmaxPREQretries);
 398         MESHPARAMS_DEL(path_refresh_time);
 399         MESHPARAMS_DEL(min_discovery_timeout);
 400         debugfs_remove(sdata->mesh_config_dir);
 401         sdata->mesh_config_dir = NULL;
 402 }
 403 #endif
 404
 405 static void del_files(struct ieee80211_sub_if_data *sdata)
 406 {
 407         if (!sdata->debugfsdir)
 408                 return;
 409
 410         switch (sdata->vif.type) {
 411         case NL80211_IFTYPE_MESH_POINT:
 412 #ifdef CONFIG_MAC80211_MESH
 413                 del_mesh_stats(sdata);
 414                 del_mesh_config(sdata);
 415 #endif
 416                 break;
 417         case NL80211_IFTYPE_STATION:
 418                 del_sta_files(sdata);
 419                 break;
 420         case NL80211_IFTYPE_ADHOC:
 421                 /* XXX */
 422                 break;
 423         case NL80211_IFTYPE_AP:
 424                 del_ap_files(sdata);
 425                 break;
 426         case NL80211_IFTYPE_WDS:
 427                 del_wds_files(sdata);
 428                 break;
 429         case NL80211_IFTYPE_MONITOR:
 430                 del_monitor_files(sdata);
 431                 break;
 432         case NL80211_IFTYPE_AP_VLAN:
 433                 del_vlan_files(sdata);
 434                 break;
 435         default:
 436                 break;
 437         }
 438 }
 439
 440 static int notif_registered;
 441
 442 void ieee80211_debugfs_add_netdev(struct ieee80211_sub_if_data *sdata)
 443 {
 444         char buf[10+IFNAMSIZ];
 445
 446         if (!notif_registered)
 447                 return;
 448
 449         sprintf(buf, "netdev:%s", sdata->dev->name);
 450         sdata->debugfsdir = debugfs_create_dir(buf,
 451                 sdata->local->hw.wiphy->debugfsdir);
 452         add_files(sdata);
 453 }
 454
 455 void ieee80211_debugfs_remove_netdev(struct ieee80211_sub_if_data *sdata)
 456 {
 457         del_files(sdata);
 458         debugfs_remove(sdata->debugfsdir);
 459         sdata->debugfsdir = NULL;
 460 }
 461
 462 static int netdev_notify(struct notifier_block *nb,
 463                          unsigned long state,
 464                          void *ndev)
 465 {
 466         struct net_device *dev = ndev;
 467         struct dentry *dir;
 468         struct ieee80211_sub_if_data *sdata;
 469         char buf[10+IFNAMSIZ];
 470
 471         if (state != NETDEV_CHANGENAME)
 472                 return 0;
 473
 474         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
 475                 return 0;
 476
 477         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
 478                 return 0;
 479
 480         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 481
 482         dir = sdata->debugfsdir;
 483
 484         if (!dir)
 485                 return 0;
 486
 487         sprintf(buf, "netdev:%s", dev->name);
 488         if (!debugfs_rename(dir->d_parent, dir, dir->d_parent, buf))
 489                 printk(KERN_ERR "mac80211: debugfs: failed to rename debugfs "
 490                        "dir to %s\n", buf);
 491
 492         return 0;
 493 }
 494
 495 static struct notifier_block mac80211_debugfs_netdev_notifier = {
 496         .notifier_call = netdev_notify,
 497 };
 498
 499 void ieee80211_debugfs_netdev_init(void)
 500 {
 501         int err;
 502
 503         err = register_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 504         if (err) {
 505                 printk(KERN_ERR
 506                        "mac80211: failed to install netdev notifier,"
 507                        " disabling per-netdev debugfs!\n");
 508         } else
 509                 notif_registered = 1;
 510 }
 511
 512 void ieee80211_debugfs_netdev_exit(void)
 513 {
 514         unregister_netdevice_notifier(&mac80211_debugfs_netdev_notifier);
 515         notif_registered = 0;
 516 }