net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/wireless.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/pm_qos_params.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35
  36
  37 bool ieee80211_disable_40mhz_24ghz;
  38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
  39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
  40                  "Disable 40MHz support in the 2.4GHz band");
  41
  42 void ieee80211_configure_filter(struct ieee80211_local *local)
  43 {
  44         u64 mc;
  45         unsigned int changed_flags;
  46         unsigned int new_flags = 0;
  47
  48         if (atomic_read(&local->iff_promiscs))
  49                 new_flags |= FIF_PROMISC_IN_BSS;
  50
  51         if (atomic_read(&local->iff_allmultis))
  52                 new_flags |= FIF_ALLMULTI;
  53
  54         if (local->monitors || local->scanning)
  55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  56
  57         if (local->fif_fcsfail)
  58                 new_flags |= FIF_FCSFAIL;
  59
  60         if (local->fif_plcpfail)
  61                 new_flags |= FIF_PLCPFAIL;
  62
  63         if (local->fif_control)
  64                 new_flags |= FIF_CONTROL;
  65
  66         if (local->fif_other_bss)
  67                 new_flags |= FIF_OTHER_BSS;
  68
  69         if (local->fif_pspoll)
  70                 new_flags |= FIF_PSPOLL;
  71
  72         spin_lock_bh(&local->filter_lock);
  73         changed_flags = local->filter_flags ^ new_flags;
  74
  75         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
  76         spin_unlock_bh(&local->filter_lock);
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         drv_configure_filter(local, changed_flags, &new_flags, mc);
  82
  83         WARN_ON(new_flags & (1<<31));
  84
  85         local->filter_flags = new_flags & ~(1<<31);
  86 }
  87
  88 static void ieee80211_reconfig_filter(struct work_struct *work)
  89 {
  90         struct ieee80211_local *local =
  91                 container_of(work, struct ieee80211_local, reconfig_filter);
  92
  93         ieee80211_configure_filter(local);
  94 }
  95
  96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  97 {
  98         struct ieee80211_channel *chan, *scan_chan;
  99         int ret = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102
 103         might_sleep();
 104
 105         scan_chan = local->scan_channel;
 106
 107         if (scan_chan) {
 108                 chan = scan_chan;
 109                 channel_type = NL80211_CHAN_NO_HT;
 110         } else {
 111                 chan = local->oper_channel;
 112                 channel_type = local->oper_channel_type;
 113         }
 114
 115         if (chan != local->hw.conf.channel ||
 116             channel_type != local->hw.conf.channel_type) {
 117                 local->hw.conf.channel = chan;
 118                 local->hw.conf.channel_type = channel_type;
 119                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 120         }
 121
 122         if (!conf_is_ht(&local->hw.conf)) {
 123                 /*
 124                  * mac80211.h documents that this is only valid
 125                  * when the channel is set to an HT type, and
 126                  * that otherwise STATIC is used.
 127                  */
 128                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 129         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 130                 local->hw.conf.smps_mode = local->smps_mode;
 131                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 132         }
 133
 134         if (scan_chan)
 135                 power = chan->max_power;
 136         else
 137                 power = local->power_constr_level ?
 138                         (chan->max_power - local->power_constr_level) :
 139                         chan->max_power;
 140
 141         if (local->user_power_level >= 0)
 142                 power = min(power, local->user_power_level);
 143
 144         if (local->hw.conf.power_level != power) {
 145                 changed |= IEEE80211_CONF_CHANGE_POWER;
 146                 local->hw.conf.power_level = power;
 147         }
 148
 149         if (changed && local->open_count) {
 150                 ret = drv_config(local, changed);
 151                 /*
 152                  * Goal:
 153                  * HW reconfiguration should never fail, the driver has told
 154                  * us what it can support so it should live up to that promise.
 155                  *
 156                  * Current status:
 157                  * rfkill is not integrated with mac80211 and a
 158                  * configuration command can thus fail if hardware rfkill
 159                  * is enabled
 160                  *
 161                  * FIXME: integrate rfkill with mac80211 and then add this
 162                  * WARN_ON() back
 163                  *
 164                  */
 165                 /* WARN_ON(ret); */
 166         }
 167
 168         return ret;
 169 }
 170
 171 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 172                                       u32 changed)
 173 {
 174         struct ieee80211_local *local = sdata->local;
 175         static const u8 zero[ETH_ALEN] = { 0 };
 176
 177         if (!changed)
 178                 return;
 179
 180         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 181                 /*
 182                  * While not associated, claim a BSSID of all-zeroes
 183                  * so that drivers don't do any weird things with the
 184                  * BSSID at that time.
 185                  */
 186                 if (sdata->vif.bss_conf.assoc)
 187                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 188                 else
 189                         sdata->vif.bss_conf.bssid = zero;
 190         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 191                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 192         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 193                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 194         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 195                 sdata->vif.bss_conf.bssid = zero;
 196         } else {
 197                 WARN_ON(1);
 198                 return;
 199         }
 200
 201         switch (sdata->vif.type) {
 202         case NL80211_IFTYPE_AP:
 203         case NL80211_IFTYPE_ADHOC:
 204         case NL80211_IFTYPE_MESH_POINT:
 205                 break;
 206         default:
 207                 /* do not warn to simplify caller in scan.c */
 208                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 209                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 210                         return;
 211                 break;
 212         }
 213
 214         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 215                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 216                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 217                         sdata->vif.bss_conf.enable_beacon = false;
 218                 } else {
 219                         /*
 220                          * Beacon should be enabled, but AP mode must
 221                          * check whether there is a beacon configured.
 222                          */
 223                         switch (sdata->vif.type) {
 224                         case NL80211_IFTYPE_AP:
 225                                 sdata->vif.bss_conf.enable_beacon =
 226                                         !!rcu_dereference(sdata->u.ap.beacon);
 227                                 break;
 228                         case NL80211_IFTYPE_ADHOC:
 229                                 sdata->vif.bss_conf.enable_beacon =
 230                                         !!rcu_dereference(sdata->u.ibss.presp);
 231                                 break;
 232                         case NL80211_IFTYPE_MESH_POINT:
 233                                 sdata->vif.bss_conf.enable_beacon = true;
 234                                 break;
 235                         default:
 236                                 /* not reached */
 237                                 WARN_ON(1);
 238                                 break;
 239                         }
 240                 }
 241         }
 242
 243         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 244 }
 245
 246 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 247 {
 248         sdata->vif.bss_conf.use_cts_prot = false;
 249         sdata->vif.bss_conf.use_short_preamble = false;
 250         sdata->vif.bss_conf.use_short_slot = false;
 251         return BSS_CHANGED_ERP_CTS_PROT |
 252                BSS_CHANGED_ERP_PREAMBLE |
 253                BSS_CHANGED_ERP_SLOT;
 254 }
 255
 256 static void ieee80211_tasklet_handler(unsigned long data)
 257 {
 258         struct ieee80211_local *local = (struct ieee80211_local *) data;
 259         struct sk_buff *skb;
 260         struct ieee80211_ra_tid *ra_tid;
 261
 262         while ((skb = skb_dequeue(&local->skb_queue)) ||
 263                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 264                 switch (skb->pkt_type) {
 265                 case IEEE80211_RX_MSG:
 266                         /* Clear skb->pkt_type in order to not confuse kernel
 267                          * netstack. */
 268                         skb->pkt_type = 0;
 269                         ieee80211_rx(local_to_hw(local), skb);
 270                         break;
 271                 case IEEE80211_TX_STATUS_MSG:
 272                         skb->pkt_type = 0;
 273                         ieee80211_tx_status(local_to_hw(local), skb);
 274                         break;
 275                 case IEEE80211_DELBA_MSG:
 276                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 277                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 278                                                 ra_tid->tid);
 279                         dev_kfree_skb(skb);
 280                         break;
 281                 case IEEE80211_ADDBA_MSG:
 282                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 283                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 284                                                  ra_tid->tid);
 285                         dev_kfree_skb(skb);
 286                         break ;
 287                 default:
 288                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 289                              skb->pkt_type);
 290                         dev_kfree_skb(skb);
 291                         break;
 292                 }
 293         }
 294 }
 295
 296 static void ieee80211_restart_work(struct work_struct *work)
 297 {
 298         struct ieee80211_local *local =
 299                 container_of(work, struct ieee80211_local, restart_work);
 300
 301         rtnl_lock();
 302         ieee80211_reconfig(local);
 303         rtnl_unlock();
 304 }
 305
 306 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 307 {
 308         struct ieee80211_local *local = hw_to_local(hw);
 309
 310         /* use this reason, __ieee80211_resume will unblock it */
 311         ieee80211_stop_queues_by_reason(hw,
 312                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 313
 314         schedule_work(&local->restart_work);
 315 }
 316 EXPORT_SYMBOL(ieee80211_restart_hw);
 317
 318 static void ieee80211_recalc_smps_work(struct work_struct *work)
 319 {
 320         struct ieee80211_local *local =
 321                 container_of(work, struct ieee80211_local, recalc_smps);
 322
 323         mutex_lock(&local->iflist_mtx);
 324         ieee80211_recalc_smps(local, NULL);
 325         mutex_unlock(&local->iflist_mtx);
 326 }
 327
 328 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 329                                         const struct ieee80211_ops *ops)
 330 {
 331         struct ieee80211_local *local;
 332         int priv_size, i;
 333         struct wiphy *wiphy;
 334
 335         /* Ensure 32-byte alignment of our private data and hw private data.
 336          * We use the wiphy priv data for both our ieee80211_local and for
 337          * the driver's private data
 338          *
 339          * In memory it'll be like this:
 340          *
 341          * +-------------------------+
 342          * | struct wiphy           |
 343          * +-------------------------+
 344          * | struct ieee80211_local  |
 345          * +-------------------------+
 346          * | driver's private data   |
 347          * +-------------------------+
 348          *
 349          */
 350         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 351
 352         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 353
 354         if (!wiphy)
 355                 return NULL;
 356
 357         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 358                         WIPHY_FLAG_4ADDR_AP |
 359                         WIPHY_FLAG_4ADDR_STATION;
 360         wiphy->privid = mac80211_wiphy_privid;
 361
 362         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 363
 364         local = wiphy_priv(wiphy);
 365
 366         local->hw.wiphy = wiphy;
 367
 368         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 369
 370         BUG_ON(!ops->tx);
 371         BUG_ON(!ops->start);
 372         BUG_ON(!ops->stop);
 373         BUG_ON(!ops->config);
 374         BUG_ON(!ops->add_interface);
 375         BUG_ON(!ops->remove_interface);
 376         BUG_ON(!ops->configure_filter);
 377         local->ops = ops;
 378
 379         /* set up some defaults */
 380         local->hw.queues = 1;
 381         local->hw.max_rates = 1;
 382         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 383         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 384         local->user_power_level = -1;
 385
 386         INIT_LIST_HEAD(&local->interfaces);
 387         mutex_init(&local->iflist_mtx);
 388         mutex_init(&local->scan_mtx);
 389
 390         spin_lock_init(&local->key_lock);
 391         spin_lock_init(&local->filter_lock);
 392         spin_lock_init(&local->queue_stop_reason_lock);
 393
 394         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 395
 396         ieee80211_work_init(local);
 397
 398         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 399
 400         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 401         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 402         local->smps_mode = IEEE80211_SMPS_OFF;
 403
 404         INIT_WORK(&local->dynamic_ps_enable_work,
 405                   ieee80211_dynamic_ps_enable_work);
 406         INIT_WORK(&local->dynamic_ps_disable_work,
 407                   ieee80211_dynamic_ps_disable_work);
 408         setup_timer(&local->dynamic_ps_timer,
 409                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 410
 411         sta_info_init(local);
 412
 413         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 414                 skb_queue_head_init(&local->pending[i]);
 415         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 416                      (unsigned long)local);
 417
 418         tasklet_init(&local->tasklet,
 419                      ieee80211_tasklet_handler,
 420                      (unsigned long) local);
 421
 422         skb_queue_head_init(&local->skb_queue);
 423         skb_queue_head_init(&local->skb_queue_unreliable);
 424
 425         spin_lock_init(&local->ampdu_lock);
 426
 427         return local_to_hw(local);
 428 }
 429 EXPORT_SYMBOL(ieee80211_alloc_hw);
 430
 431 int ieee80211_register_hw(struct ieee80211_hw *hw)
 432 {
 433         struct ieee80211_local *local = hw_to_local(hw);
 434         int result;
 435         enum ieee80211_band band;
 436         int channels, i, j, max_bitrates;
 437         bool supp_ht;
 438         static const u32 cipher_suites[] = {
 439                 WLAN_CIPHER_SUITE_WEP40,
 440                 WLAN_CIPHER_SUITE_WEP104,
 441                 WLAN_CIPHER_SUITE_TKIP,
 442                 WLAN_CIPHER_SUITE_CCMP,
 443
 444                 /* keep last -- depends on hw flags! */
 445                 WLAN_CIPHER_SUITE_AES_CMAC
 446         };
 447
 448         /*
 449          * generic code guarantees at least one band,
 450          * set this very early because much code assumes
 451          * that hw.conf.channel is assigned
 452          */
 453         channels = 0;
 454         max_bitrates = 0;
 455         supp_ht = false;
 456         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 457                 struct ieee80211_supported_band *sband;
 458
 459                 sband = local->hw.wiphy->bands[band];
 460                 if (!sband)
 461                         continue;
 462                 if (!local->oper_channel) {
 463                         /* init channel we're on */
 464                         local->hw.conf.channel =
 465                         local->oper_channel = &sband->channels[0];
 466                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 467                 }
 468                 channels += sband->n_channels;
 469
 470                 if (max_bitrates < sband->n_bitrates)
 471                         max_bitrates = sband->n_bitrates;
 472                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 473         }
 474
 475         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 476                                       sizeof(void *) * channels, GFP_KERNEL);
 477         if (!local->int_scan_req)
 478                 return -ENOMEM;
 479
 480         /* if low-level driver supports AP, we also support VLAN */
 481         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 482                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 483
 484         /* mac80211 always supports monitor */
 485         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 486
 487         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 488                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 489         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 490                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 491
 492         /*
 493          * Calculate scan IE length -- we need this to alloc
 494          * memory and to subtract from the driver limit. It
 495          * includes the (extended) supported rates and HT
 496          * information -- SSID is the driver's responsibility.
 497          */
 498         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 499         if (supp_ht)
 500                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 501
 502         if (!local->ops->hw_scan) {
 503                 /* For hw_scan, driver needs to set these up. */
 504                 local->hw.wiphy->max_scan_ssids = 4;
 505                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 506         }
 507
 508         /*
 509          * If the driver supports any scan IEs, then assume the
 510          * limit includes the IEs mac80211 will add, otherwise
 511          * leave it at zero and let the driver sort it out; we
 512          * still pass our IEs to the driver but userspace will
 513          * not be allowed to in that case.
 514          */
 515         if (local->hw.wiphy->max_scan_ie_len)
 516                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 517
 518         local->hw.wiphy->cipher_suites = cipher_suites;
 519         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 520         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 521                 local->hw.wiphy->n_cipher_suites--;
 522
 523         result = wiphy_register(local->hw.wiphy);
 524         if (result < 0)
 525                 goto fail_wiphy_register;
 526
 527         /*
 528          * We use the number of queues for feature tests (QoS, HT) internally
 529          * so restrict them appropriately.
 530          */
 531         if (hw->queues > IEEE80211_MAX_QUEUES)
 532                 hw->queues = IEEE80211_MAX_QUEUES;
 533
 534         local->workqueue =
 535                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 536         if (!local->workqueue) {
 537                 result = -ENOMEM;
 538                 goto fail_workqueue;
 539         }
 540
 541         /*
 542          * The hardware needs headroom for sending the frame,
 543          * and we need some headroom for passing the frame to monitor
 544          * interfaces, but never both at the same time.
 545          */
 546         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 547                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 548         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 549                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 550
 551         debugfs_hw_add(local);
 552
 553         if (local->hw.max_listen_interval == 0)
 554                 local->hw.max_listen_interval = 1;
 555
 556         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 557
 558         result = sta_info_start(local);
 559         if (result < 0)
 560                 goto fail_sta_info;
 561
 562         result = ieee80211_wep_init(local);
 563         if (result < 0) {
 564                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 565                        wiphy_name(local->hw.wiphy), result);
 566                 goto fail_wep;
 567         }
 568
 569         rtnl_lock();
 570
 571         result = ieee80211_init_rate_ctrl_alg(local,
 572                                               hw->rate_control_algorithm);
 573         if (result < 0) {
 574                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 575                        "algorithm\n", wiphy_name(local->hw.wiphy));
 576                 goto fail_rate;
 577         }
 578
 579         /* add one default STA interface if supported */
 580         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 581                 result = ieee80211_if_add(local, "wlan%d", NULL,
 582                                           NL80211_IFTYPE_STATION, NULL);
 583                 if (result)
 584                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 585                                wiphy_name(local->hw.wiphy));
 586         }
 587
 588         rtnl_unlock();
 589
 590         ieee80211_led_init(local);
 591
 592         /* alloc internal scan request */
 593         i = 0;
 594         local->int_scan_req->ssids = &local->scan_ssid;
 595         local->int_scan_req->n_ssids = 1;
 596         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 597                 if (!hw->wiphy->bands[band])
 598                         continue;
 599                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 600                         local->int_scan_req->channels[i] =
 601                                 &hw->wiphy->bands[band]->channels[j];
 602                         i++;
 603                 }
 604         }
 605         local->int_scan_req->n_channels = i;
 606
 607         local->network_latency_notifier.notifier_call =
 608                 ieee80211_max_network_latency;
 609         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 610                                      &local->network_latency_notifier);
 611
 612         if (result) {
 613                 rtnl_lock();
 614                 goto fail_pm_qos;
 615         }
 616
 617         return 0;
 618
 619  fail_pm_qos:
 620         ieee80211_led_exit(local);
 621         ieee80211_remove_interfaces(local);
 622  fail_rate:
 623         rtnl_unlock();
 624         ieee80211_wep_free(local);
 625  fail_wep:
 626         sta_info_stop(local);
 627  fail_sta_info:
 628         destroy_workqueue(local->workqueue);
 629  fail_workqueue:
 630         wiphy_unregister(local->hw.wiphy);
 631  fail_wiphy_register:
 632         kfree(local->int_scan_req);
 633         return result;
 634 }
 635 EXPORT_SYMBOL(ieee80211_register_hw);
 636
 637 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 638 {
 639         struct ieee80211_local *local = hw_to_local(hw);
 640
 641         tasklet_kill(&local->tx_pending_tasklet);
 642         tasklet_kill(&local->tasklet);
 643
 644         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 645                                &local->network_latency_notifier);
 646
 647         rtnl_lock();
 648
 649         /*
 650          * At this point, interface list manipulations are fine
 651          * because the driver cannot be handing us frames any
 652          * more and the tasklet is killed.
 653          */
 654         ieee80211_remove_interfaces(local);
 655
 656         rtnl_unlock();
 657
 658         cancel_work_sync(&local->reconfig_filter);
 659
 660         ieee80211_clear_tx_pending(local);
 661         sta_info_stop(local);
 662         rate_control_deinitialize(local);
 663
 664         if (skb_queue_len(&local->skb_queue) ||
 665             skb_queue_len(&local->skb_queue_unreliable))
 666                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 667                        wiphy_name(local->hw.wiphy));
 668         skb_queue_purge(&local->skb_queue);
 669         skb_queue_purge(&local->skb_queue_unreliable);
 670
 671         destroy_workqueue(local->workqueue);
 672         wiphy_unregister(local->hw.wiphy);
 673         ieee80211_wep_free(local);
 674         ieee80211_led_exit(local);
 675         kfree(local->int_scan_req);
 676 }
 677 EXPORT_SYMBOL(ieee80211_unregister_hw);
 678
 679 void ieee80211_free_hw(struct ieee80211_hw *hw)
 680 {
 681         struct ieee80211_local *local = hw_to_local(hw);
 682
 683         mutex_destroy(&local->iflist_mtx);
 684         mutex_destroy(&local->scan_mtx);
 685
 686         wiphy_free(local->hw.wiphy);
 687 }
 688 EXPORT_SYMBOL(ieee80211_free_hw);
 689
 690 static int __init ieee80211_init(void)
 691 {
 692         struct sk_buff *skb;
 693         int ret;
 694
 695         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 696         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 697                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 698
 699         ret = rc80211_minstrel_init();
 700         if (ret)
 701                 return ret;
 702
 703         ret = rc80211_pid_init();
 704         if (ret)
 705                 goto err_pid;
 706
 707         ret = ieee80211_iface_init();
 708         if (ret)
 709                 goto err_netdev;
 710
 711         return 0;
 712  err_netdev:
 713         rc80211_pid_exit();
 714  err_pid:
 715         rc80211_minstrel_exit();
 716
 717         return ret;
 718 }
 719
 720 static void __exit ieee80211_exit(void)
 721 {
 722         rc80211_pid_exit();
 723         rc80211_minstrel_exit();
 724
 725         /*
 726          * For key todo, it'll be empty by now but the work
 727          * might still be scheduled.
 728          */
 729         flush_scheduled_work();
 730
 731         if (mesh_allocated)
 732                 ieee80211s_stop();
 733
 734         ieee80211_iface_exit();
 735 }
 736
 737
 738 subsys_initcall(ieee80211_init);
 739 module_exit(ieee80211_exit);
 740
 741 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 742 MODULE_LICENSE("GPL");