SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 if (local->tmp_channel) {
 111                 chan = scan_chan = local->tmp_channel;
 112                 channel_type = local->tmp_channel_type;
 113         } else {
 114                 chan = local->oper_channel;
 115                 channel_type = local->oper_channel_type;
 116         }
 117
 118         if (chan != local->hw.conf.channel ||
 119             channel_type != local->hw.conf.channel_type) {
 120                 local->hw.conf.channel = chan;
 121                 local->hw.conf.channel_type = channel_type;
 122                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 123         }
 124
 125         if (!conf_is_ht(&local->hw.conf)) {
 126                 /*
 127                  * mac80211.h documents that this is only valid
 128                  * when the channel is set to an HT type, and
 129                  * that otherwise STATIC is used.
 130                  */
 131                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 132         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 133                 local->hw.conf.smps_mode = local->smps_mode;
 134                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 135         }
 136
 137         if (scan_chan)
 138                 power = chan->max_power;
 139         else
 140                 power = local->power_constr_level ?
 141                         (chan->max_power - local->power_constr_level) :
 142                         chan->max_power;
 143
 144         if (local->user_power_level >= 0)
 145                 power = min(power, local->user_power_level);
 146
 147         if (local->hw.conf.power_level != power) {
 148                 changed |= IEEE80211_CONF_CHANGE_POWER;
 149                 local->hw.conf.power_level = power;
 150         }
 151
 152         if (changed && local->open_count) {
 153                 ret = drv_config(local, changed);
 154                 /*
 155                  * Goal:
 156                  * HW reconfiguration should never fail, the driver has told
 157                  * us what it can support so it should live up to that promise.
 158                  *
 159                  * Current status:
 160                  * rfkill is not integrated with mac80211 and a
 161                  * configuration command can thus fail if hardware rfkill
 162                  * is enabled
 163                  *
 164                  * FIXME: integrate rfkill with mac80211 and then add this
 165                  * WARN_ON() back
 166                  *
 167                  */
 168                 /* WARN_ON(ret); */
 169         }
 170
 171         return ret;
 172 }
 173
 174 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 175                                       u32 changed)
 176 {
 177         struct ieee80211_local *local = sdata->local;
 178         static const u8 zero[ETH_ALEN] = { 0 };
 179
 180         if (!changed)
 181                 return;
 182
 183         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 184                 /*
 185                  * While not associated, claim a BSSID of all-zeroes
 186                  * so that drivers don't do any weird things with the
 187                  * BSSID at that time.
 188                  */
 189                 if (sdata->vif.bss_conf.assoc)
 190                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 191                 else
 192                         sdata->vif.bss_conf.bssid = zero;
 193         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 194                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 195         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 196                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 197         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 198                 sdata->vif.bss_conf.bssid = zero;
 199         } else {
 200                 WARN_ON(1);
 201                 return;
 202         }
 203
 204         switch (sdata->vif.type) {
 205         case NL80211_IFTYPE_AP:
 206         case NL80211_IFTYPE_ADHOC:
 207         case NL80211_IFTYPE_MESH_POINT:
 208                 break;
 209         default:
 210                 /* do not warn to simplify caller in scan.c */
 211                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 212                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 213                         return;
 214                 break;
 215         }
 216
 217         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 218                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 219                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 220                         sdata->vif.bss_conf.enable_beacon = false;
 221                 } else {
 222                         /*
 223                          * Beacon should be enabled, but AP mode must
 224                          * check whether there is a beacon configured.
 225                          */
 226                         switch (sdata->vif.type) {
 227                         case NL80211_IFTYPE_AP:
 228                                 sdata->vif.bss_conf.enable_beacon =
 229                                         !!rcu_dereference(sdata->u.ap.beacon);
 230                                 break;
 231                         case NL80211_IFTYPE_ADHOC:
 232                                 sdata->vif.bss_conf.enable_beacon =
 233                                         !!rcu_dereference(sdata->u.ibss.presp);
 234                                 break;
 235                         case NL80211_IFTYPE_MESH_POINT:
 236                                 sdata->vif.bss_conf.enable_beacon = true;
 237                                 break;
 238                         default:
 239                                 /* not reached */
 240                                 WARN_ON(1);
 241                                 break;
 242                         }
 243                 }
 244         }
 245
 246         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 247 }
 248
 249 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 250 {
 251         sdata->vif.bss_conf.use_cts_prot = false;
 252         sdata->vif.bss_conf.use_short_preamble = false;
 253         sdata->vif.bss_conf.use_short_slot = false;
 254         return BSS_CHANGED_ERP_CTS_PROT |
 255                BSS_CHANGED_ERP_PREAMBLE |
 256                BSS_CHANGED_ERP_SLOT;
 257 }
 258
 259 static void ieee80211_tasklet_handler(unsigned long data)
 260 {
 261         struct ieee80211_local *local = (struct ieee80211_local *) data;
 262         struct sk_buff *skb;
 263         struct ieee80211_ra_tid *ra_tid;
 264
 265         while ((skb = skb_dequeue(&local->skb_queue)) ||
 266                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 267                 switch (skb->pkt_type) {
 268                 case IEEE80211_RX_MSG:
 269                         /* Clear skb->pkt_type in order to not confuse kernel
 270                          * netstack. */
 271                         skb->pkt_type = 0;
 272                         ieee80211_rx(local_to_hw(local), skb);
 273                         break;
 274                 case IEEE80211_TX_STATUS_MSG:
 275                         skb->pkt_type = 0;
 276                         ieee80211_tx_status(local_to_hw(local), skb);
 277                         break;
 278                 case IEEE80211_DELBA_MSG:
 279                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 280                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 281                                                 ra_tid->tid);
 282                         dev_kfree_skb(skb);
 283                         break;
 284                 case IEEE80211_ADDBA_MSG:
 285                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 286                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 287                                                  ra_tid->tid);
 288                         dev_kfree_skb(skb);
 289                         break ;
 290                 default:
 291                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 292                              skb->pkt_type);
 293                         dev_kfree_skb(skb);
 294                         break;
 295                 }
 296         }
 297 }
 298
 299 static void ieee80211_restart_work(struct work_struct *work)
 300 {
 301         struct ieee80211_local *local =
 302                 container_of(work, struct ieee80211_local, restart_work);
 303
 304         rtnl_lock();
 305         ieee80211_reconfig(local);
 306         rtnl_unlock();
 307 }
 308
 309 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 310 {
 311         struct ieee80211_local *local = hw_to_local(hw);
 312
 313         /* use this reason, __ieee80211_resume will unblock it */
 314         ieee80211_stop_queues_by_reason(hw,
 315                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 316
 317         schedule_work(&local->restart_work);
 318 }
 319 EXPORT_SYMBOL(ieee80211_restart_hw);
 320
 321 static void ieee80211_recalc_smps_work(struct work_struct *work)
 322 {
 323         struct ieee80211_local *local =
 324                 container_of(work, struct ieee80211_local, recalc_smps);
 325
 326         mutex_lock(&local->iflist_mtx);
 327         ieee80211_recalc_smps(local, NULL);
 328         mutex_unlock(&local->iflist_mtx);
 329 }
 330
 331 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 332                                         const struct ieee80211_ops *ops)
 333 {
 334         struct ieee80211_local *local;
 335         int priv_size, i;
 336         struct wiphy *wiphy;
 337
 338         /* Ensure 32-byte alignment of our private data and hw private data.
 339          * We use the wiphy priv data for both our ieee80211_local and for
 340          * the driver's private data
 341          *
 342          * In memory it'll be like this:
 343          *
 344          * +-------------------------+
 345          * | struct wiphy           |
 346          * +-------------------------+
 347          * | struct ieee80211_local  |
 348          * +-------------------------+
 349          * | driver's private data   |
 350          * +-------------------------+
 351          *
 352          */
 353         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 354
 355         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 356
 357         if (!wiphy)
 358                 return NULL;
 359
 360         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 361                         WIPHY_FLAG_4ADDR_AP |
 362                         WIPHY_FLAG_4ADDR_STATION;
 363         wiphy->privid = mac80211_wiphy_privid;
 364
 365         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 366
 367         local = wiphy_priv(wiphy);
 368
 369         local->hw.wiphy = wiphy;
 370
 371         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 372
 373         BUG_ON(!ops->tx);
 374         BUG_ON(!ops->start);
 375         BUG_ON(!ops->stop);
 376         BUG_ON(!ops->config);
 377         BUG_ON(!ops->add_interface);
 378         BUG_ON(!ops->remove_interface);
 379         BUG_ON(!ops->configure_filter);
 380         local->ops = ops;
 381
 382         /* set up some defaults */
 383         local->hw.queues = 1;
 384         local->hw.max_rates = 1;
 385         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 386         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 387         local->user_power_level = -1;
 388
 389         INIT_LIST_HEAD(&local->interfaces);
 390         mutex_init(&local->iflist_mtx);
 391         mutex_init(&local->scan_mtx);
 392
 393         spin_lock_init(&local->key_lock);
 394         spin_lock_init(&local->filter_lock);
 395         spin_lock_init(&local->queue_stop_reason_lock);
 396
 397         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 398
 399         ieee80211_work_init(local);
 400
 401         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 402
 403         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 404         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 405         local->smps_mode = IEEE80211_SMPS_OFF;
 406
 407         INIT_WORK(&local->dynamic_ps_enable_work,
 408                   ieee80211_dynamic_ps_enable_work);
 409         INIT_WORK(&local->dynamic_ps_disable_work,
 410                   ieee80211_dynamic_ps_disable_work);
 411         setup_timer(&local->dynamic_ps_timer,
 412                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 413
 414         sta_info_init(local);
 415
 416         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 417                 skb_queue_head_init(&local->pending[i]);
 418         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 419                      (unsigned long)local);
 420
 421         tasklet_init(&local->tasklet,
 422                      ieee80211_tasklet_handler,
 423                      (unsigned long) local);
 424
 425         skb_queue_head_init(&local->skb_queue);
 426         skb_queue_head_init(&local->skb_queue_unreliable);
 427
 428         spin_lock_init(&local->ampdu_lock);
 429
 430         return local_to_hw(local);
 431 }
 432 EXPORT_SYMBOL(ieee80211_alloc_hw);
 433
 434 int ieee80211_register_hw(struct ieee80211_hw *hw)
 435 {
 436         struct ieee80211_local *local = hw_to_local(hw);
 437         int result;
 438         enum ieee80211_band band;
 439         int channels, i, j, max_bitrates;
 440         bool supp_ht;
 441         static const u32 cipher_suites[] = {
 442                 WLAN_CIPHER_SUITE_WEP40,
 443                 WLAN_CIPHER_SUITE_WEP104,
 444                 WLAN_CIPHER_SUITE_TKIP,
 445                 WLAN_CIPHER_SUITE_CCMP,
 446
 447                 /* keep last -- depends on hw flags! */
 448                 WLAN_CIPHER_SUITE_AES_CMAC
 449         };
 450
 451         /*
 452          * generic code guarantees at least one band,
 453          * set this very early because much code assumes
 454          * that hw.conf.channel is assigned
 455          */
 456         channels = 0;
 457         max_bitrates = 0;
 458         supp_ht = false;
 459         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 460                 struct ieee80211_supported_band *sband;
 461
 462                 sband = local->hw.wiphy->bands[band];
 463                 if (!sband)
 464                         continue;
 465                 if (!local->oper_channel) {
 466                         /* init channel we're on */
 467                         local->hw.conf.channel =
 468                         local->oper_channel = &sband->channels[0];
 469                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 470                 }
 471                 channels += sband->n_channels;
 472
 473                 if (max_bitrates < sband->n_bitrates)
 474                         max_bitrates = sband->n_bitrates;
 475                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 476         }
 477
 478         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 479                                       sizeof(void *) * channels, GFP_KERNEL);
 480         if (!local->int_scan_req)
 481                 return -ENOMEM;
 482
 483         /* if low-level driver supports AP, we also support VLAN */
 484         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 485                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 486
 487         /* mac80211 always supports monitor */
 488         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 489
 490         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 491                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 492         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 493                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 494
 495         /*
 496          * Calculate scan IE length -- we need this to alloc
 497          * memory and to subtract from the driver limit. It
 498          * includes the (extended) supported rates and HT
 499          * information -- SSID is the driver's responsibility.
 500          */
 501         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 502         if (supp_ht)
 503                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 504
 505         if (!local->ops->hw_scan) {
 506                 /* For hw_scan, driver needs to set these up. */
 507                 local->hw.wiphy->max_scan_ssids = 4;
 508                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 509         }
 510
 511         /*
 512          * If the driver supports any scan IEs, then assume the
 513          * limit includes the IEs mac80211 will add, otherwise
 514          * leave it at zero and let the driver sort it out; we
 515          * still pass our IEs to the driver but userspace will
 516          * not be allowed to in that case.
 517          */
 518         if (local->hw.wiphy->max_scan_ie_len)
 519                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 520
 521         local->hw.wiphy->cipher_suites = cipher_suites;
 522         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 523         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 524                 local->hw.wiphy->n_cipher_suites--;
 525
 526         result = wiphy_register(local->hw.wiphy);
 527         if (result < 0)
 528                 goto fail_wiphy_register;
 529
 530         /*
 531          * We use the number of queues for feature tests (QoS, HT) internally
 532          * so restrict them appropriately.
 533          */
 534         if (hw->queues > IEEE80211_MAX_QUEUES)
 535                 hw->queues = IEEE80211_MAX_QUEUES;
 536
 537         local->workqueue =
 538                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 539         if (!local->workqueue) {
 540                 result = -ENOMEM;
 541                 goto fail_workqueue;
 542         }
 543
 544         /*
 545          * The hardware needs headroom for sending the frame,
 546          * and we need some headroom for passing the frame to monitor
 547          * interfaces, but never both at the same time.
 548          */
 549         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 550                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 551         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 552                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 553
 554         debugfs_hw_add(local);
 555
 556         if (local->hw.max_listen_interval == 0)
 557                 local->hw.max_listen_interval = 1;
 558
 559         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 560
 561         result = sta_info_start(local);
 562         if (result < 0)
 563                 goto fail_sta_info;
 564
 565         result = ieee80211_wep_init(local);
 566         if (result < 0) {
 567                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 568                        wiphy_name(local->hw.wiphy), result);
 569                 goto fail_wep;
 570         }
 571
 572         rtnl_lock();
 573
 574         result = ieee80211_init_rate_ctrl_alg(local,
 575                                               hw->rate_control_algorithm);
 576         if (result < 0) {
 577                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 578                        "algorithm\n", wiphy_name(local->hw.wiphy));
 579                 goto fail_rate;
 580         }
 581
 582         /* add one default STA interface if supported */
 583         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 584                 result = ieee80211_if_add(local, "wlan%d", NULL,
 585                                           NL80211_IFTYPE_STATION, NULL);
 586                 if (result)
 587                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 588                                wiphy_name(local->hw.wiphy));
 589         }
 590
 591         rtnl_unlock();
 592
 593         ieee80211_led_init(local);
 594
 595         /* alloc internal scan request */
 596         i = 0;
 597         local->int_scan_req->ssids = &local->scan_ssid;
 598         local->int_scan_req->n_ssids = 1;
 599         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 600                 if (!hw->wiphy->bands[band])
 601                         continue;
 602                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 603                         local->int_scan_req->channels[i] =
 604                                 &hw->wiphy->bands[band]->channels[j];
 605                         i++;
 606                 }
 607         }
 608         local->int_scan_req->n_channels = i;
 609
 610         local->network_latency_notifier.notifier_call =
 611                 ieee80211_max_network_latency;
 612         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 613                                      &local->network_latency_notifier);
 614
 615         if (result) {
 616                 rtnl_lock();
 617                 goto fail_pm_qos;
 618         }
 619
 620         return 0;
 621
 622  fail_pm_qos:
 623         ieee80211_led_exit(local);
 624         ieee80211_remove_interfaces(local);
 625  fail_rate:
 626         rtnl_unlock();
 627         ieee80211_wep_free(local);
 628  fail_wep:
 629         sta_info_stop(local);
 630  fail_sta_info:
 631         destroy_workqueue(local->workqueue);
 632  fail_workqueue:
 633         wiphy_unregister(local->hw.wiphy);
 634  fail_wiphy_register:
 635         kfree(local->int_scan_req);
 636         return result;
 637 }
 638 EXPORT_SYMBOL(ieee80211_register_hw);
 639
 640 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 641 {
 642         struct ieee80211_local *local = hw_to_local(hw);
 643
 644         tasklet_kill(&local->tx_pending_tasklet);
 645         tasklet_kill(&local->tasklet);
 646
 647         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 648                                &local->network_latency_notifier);
 649
 650         rtnl_lock();
 651
 652         /*
 653          * At this point, interface list manipulations are fine
 654          * because the driver cannot be handing us frames any
 655          * more and the tasklet is killed.
 656          */
 657         ieee80211_remove_interfaces(local);
 658
 659         rtnl_unlock();
 660
 661         cancel_work_sync(&local->reconfig_filter);
 662
 663         ieee80211_clear_tx_pending(local);
 664         sta_info_stop(local);
 665         rate_control_deinitialize(local);
 666
 667         if (skb_queue_len(&local->skb_queue) ||
 668             skb_queue_len(&local->skb_queue_unreliable))
 669                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 670                        wiphy_name(local->hw.wiphy));
 671         skb_queue_purge(&local->skb_queue);
 672         skb_queue_purge(&local->skb_queue_unreliable);
 673
 674         destroy_workqueue(local->workqueue);
 675         wiphy_unregister(local->hw.wiphy);
 676         ieee80211_wep_free(local);
 677         ieee80211_led_exit(local);
 678         kfree(local->int_scan_req);
 679 }
 680 EXPORT_SYMBOL(ieee80211_unregister_hw);
 681
 682 void ieee80211_free_hw(struct ieee80211_hw *hw)
 683 {
 684         struct ieee80211_local *local = hw_to_local(hw);
 685
 686         mutex_destroy(&local->iflist_mtx);
 687         mutex_destroy(&local->scan_mtx);
 688
 689         wiphy_free(local->hw.wiphy);
 690 }
 691 EXPORT_SYMBOL(ieee80211_free_hw);
 692
 693 static int __init ieee80211_init(void)
 694 {
 695         struct sk_buff *skb;
 696         int ret;
 697
 698         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 699         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 700                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 701
 702         ret = rc80211_minstrel_init();
 703         if (ret)
 704                 return ret;
 705
 706         ret = rc80211_pid_init();
 707         if (ret)
 708                 goto err_pid;
 709
 710         ret = ieee80211_iface_init();
 711         if (ret)
 712                 goto err_netdev;
 713
 714         return 0;
 715  err_netdev:
 716         rc80211_pid_exit();
 717  err_pid:
 718         rc80211_minstrel_exit();
 719
 720         return ret;
 721 }
 722
 723 static void __exit ieee80211_exit(void)
 724 {
 725         rc80211_pid_exit();
 726         rc80211_minstrel_exit();
 727
 728         /*
 729          * For key todo, it'll be empty by now but the work
 730          * might still be scheduled.
 731          */
 732         flush_scheduled_work();
 733
 734         if (mesh_allocated)
 735                 ieee80211s_stop();
 736
 737         ieee80211_iface_exit();
 738 }
 739
 740
 741 subsys_initcall(ieee80211_init);
 742 module_exit(ieee80211_exit);
 743
 744 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 745 MODULE_LICENSE("GPL");