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 void ieee80211_configure_filter(struct ieee80211_local *local)
  37 {
  38         u64 mc;
  39         unsigned int changed_flags;
  40         unsigned int new_flags = 0;
  41
  42         if (atomic_read(&local->iff_promiscs))
  43                 new_flags |= FIF_PROMISC_IN_BSS;
  44
  45         if (atomic_read(&local->iff_allmultis))
  46                 new_flags |= FIF_ALLMULTI;
  47
  48         if (local->monitors || local->scanning)
  49                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  50
  51         if (local->fif_fcsfail)
  52                 new_flags |= FIF_FCSFAIL;
  53
  54         if (local->fif_plcpfail)
  55                 new_flags |= FIF_PLCPFAIL;
  56
  57         if (local->fif_control)
  58                 new_flags |= FIF_CONTROL;
  59
  60         if (local->fif_other_bss)
  61                 new_flags |= FIF_OTHER_BSS;
  62
  63         if (local->fif_pspoll)
  64                 new_flags |= FIF_PSPOLL;
  65
  66         spin_lock_bh(&local->filter_lock);
  67         changed_flags = local->filter_flags ^ new_flags;
  68
  69         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
  70         spin_unlock_bh(&local->filter_lock);
  71
  72         /* be a bit nasty */
  73         new_flags |= (1<<31);
  74
  75         drv_configure_filter(local, changed_flags, &new_flags, mc);
  76
  77         WARN_ON(new_flags & (1<<31));
  78
  79         local->filter_flags = new_flags & ~(1<<31);
  80 }
  81
  82 static void ieee80211_reconfig_filter(struct work_struct *work)
  83 {
  84         struct ieee80211_local *local =
  85                 container_of(work, struct ieee80211_local, reconfig_filter);
  86
  87         ieee80211_configure_filter(local);
  88 }
  89
  90 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  91 {
  92         struct ieee80211_channel *chan, *scan_chan;
  93         int ret = 0;
  94         int power;
  95         enum nl80211_channel_type channel_type;
  96
  97         might_sleep();
  98
  99         scan_chan = local->scan_channel;
 100
 101         if (scan_chan) {
 102                 chan = scan_chan;
 103                 channel_type = NL80211_CHAN_NO_HT;
 104         } else {
 105                 chan = local->oper_channel;
 106                 channel_type = local->oper_channel_type;
 107         }
 108
 109         if (chan != local->hw.conf.channel ||
 110             channel_type != local->hw.conf.channel_type) {
 111                 local->hw.conf.channel = chan;
 112                 local->hw.conf.channel_type = channel_type;
 113                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 114         }
 115
 116         if (!conf_is_ht(&local->hw.conf)) {
 117                 /*
 118                  * mac80211.h documents that this is only valid
 119                  * when the channel is set to an HT type, and
 120                  * that otherwise STATIC is used.
 121                  */
 122                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 123         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 124                 local->hw.conf.smps_mode = local->smps_mode;
 125                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 126         }
 127
 128         if (scan_chan)
 129                 power = chan->max_power;
 130         else
 131                 power = local->power_constr_level ?
 132                         (chan->max_power - local->power_constr_level) :
 133                         chan->max_power;
 134
 135         if (local->user_power_level >= 0)
 136                 power = min(power, local->user_power_level);
 137
 138         if (local->hw.conf.power_level != power) {
 139                 changed |= IEEE80211_CONF_CHANGE_POWER;
 140                 local->hw.conf.power_level = power;
 141         }
 142
 143         if (changed && local->open_count) {
 144                 ret = drv_config(local, changed);
 145                 /*
 146                  * Goal:
 147                  * HW reconfiguration should never fail, the driver has told
 148                  * us what it can support so it should live up to that promise.
 149                  *
 150                  * Current status:
 151                  * rfkill is not integrated with mac80211 and a
 152                  * configuration command can thus fail if hardware rfkill
 153                  * is enabled
 154                  *
 155                  * FIXME: integrate rfkill with mac80211 and then add this
 156                  * WARN_ON() back
 157                  *
 158                  */
 159                 /* WARN_ON(ret); */
 160         }
 161
 162         return ret;
 163 }
 164
 165 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 166                                       u32 changed)
 167 {
 168         struct ieee80211_local *local = sdata->local;
 169         static const u8 zero[ETH_ALEN] = { 0 };
 170
 171         if (!changed)
 172                 return;
 173
 174         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 175                 /*
 176                  * While not associated, claim a BSSID of all-zeroes
 177                  * so that drivers don't do any weird things with the
 178                  * BSSID at that time.
 179                  */
 180                 if (sdata->vif.bss_conf.assoc)
 181                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 182                 else
 183                         sdata->vif.bss_conf.bssid = zero;
 184         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 185                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 186         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 187                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 188         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 189                 sdata->vif.bss_conf.bssid = zero;
 190         } else {
 191                 WARN_ON(1);
 192                 return;
 193         }
 194
 195         switch (sdata->vif.type) {
 196         case NL80211_IFTYPE_AP:
 197         case NL80211_IFTYPE_ADHOC:
 198         case NL80211_IFTYPE_MESH_POINT:
 199                 break;
 200         default:
 201                 /* do not warn to simplify caller in scan.c */
 202                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 203                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 204                         return;
 205                 break;
 206         }
 207
 208         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 209                 if (local->quiescing || !netif_running(sdata->dev) ||
 210                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 211                         sdata->vif.bss_conf.enable_beacon = false;
 212                 } else {
 213                         /*
 214                          * Beacon should be enabled, but AP mode must
 215                          * check whether there is a beacon configured.
 216                          */
 217                         switch (sdata->vif.type) {
 218                         case NL80211_IFTYPE_AP:
 219                                 sdata->vif.bss_conf.enable_beacon =
 220                                         !!rcu_dereference(sdata->u.ap.beacon);
 221                                 break;
 222                         case NL80211_IFTYPE_ADHOC:
 223                                 sdata->vif.bss_conf.enable_beacon =
 224                                         !!rcu_dereference(sdata->u.ibss.presp);
 225                                 break;
 226                         case NL80211_IFTYPE_MESH_POINT:
 227                                 sdata->vif.bss_conf.enable_beacon = true;
 228                                 break;
 229                         default:
 230                                 /* not reached */
 231                                 WARN_ON(1);
 232                                 break;
 233                         }
 234                 }
 235         }
 236
 237         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 238 }
 239
 240 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 241 {
 242         sdata->vif.bss_conf.use_cts_prot = false;
 243         sdata->vif.bss_conf.use_short_preamble = false;
 244         sdata->vif.bss_conf.use_short_slot = false;
 245         return BSS_CHANGED_ERP_CTS_PROT |
 246                BSS_CHANGED_ERP_PREAMBLE |
 247                BSS_CHANGED_ERP_SLOT;
 248 }
 249
 250 static void ieee80211_tasklet_handler(unsigned long data)
 251 {
 252         struct ieee80211_local *local = (struct ieee80211_local *) data;
 253         struct sk_buff *skb;
 254         struct ieee80211_ra_tid *ra_tid;
 255
 256         while ((skb = skb_dequeue(&local->skb_queue)) ||
 257                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 258                 switch (skb->pkt_type) {
 259                 case IEEE80211_RX_MSG:
 260                         /* Clear skb->pkt_type in order to not confuse kernel
 261                          * netstack. */
 262                         skb->pkt_type = 0;
 263                         ieee80211_rx(local_to_hw(local), skb);
 264                         break;
 265                 case IEEE80211_TX_STATUS_MSG:
 266                         skb->pkt_type = 0;
 267                         ieee80211_tx_status(local_to_hw(local), skb);
 268                         break;
 269                 case IEEE80211_DELBA_MSG:
 270                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 271                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 272                                                 ra_tid->tid);
 273                         dev_kfree_skb(skb);
 274                         break;
 275                 case IEEE80211_ADDBA_MSG:
 276                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 277                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 278                                                  ra_tid->tid);
 279                         dev_kfree_skb(skb);
 280                         break ;
 281                 default:
 282                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 283                              skb->pkt_type);
 284                         dev_kfree_skb(skb);
 285                         break;
 286                 }
 287         }
 288 }
 289
 290 static void ieee80211_restart_work(struct work_struct *work)
 291 {
 292         struct ieee80211_local *local =
 293                 container_of(work, struct ieee80211_local, restart_work);
 294
 295         rtnl_lock();
 296         ieee80211_reconfig(local);
 297         rtnl_unlock();
 298 }
 299
 300 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 301 {
 302         struct ieee80211_local *local = hw_to_local(hw);
 303
 304         /* use this reason, __ieee80211_resume will unblock it */
 305         ieee80211_stop_queues_by_reason(hw,
 306                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 307
 308         schedule_work(&local->restart_work);
 309 }
 310 EXPORT_SYMBOL(ieee80211_restart_hw);
 311
 312 static void ieee80211_recalc_smps_work(struct work_struct *work)
 313 {
 314         struct ieee80211_local *local =
 315                 container_of(work, struct ieee80211_local, recalc_smps);
 316
 317         mutex_lock(&local->iflist_mtx);
 318         ieee80211_recalc_smps(local, NULL);
 319         mutex_unlock(&local->iflist_mtx);
 320 }
 321
 322 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 323                                         const struct ieee80211_ops *ops)
 324 {
 325         struct ieee80211_local *local;
 326         int priv_size, i;
 327         struct wiphy *wiphy;
 328
 329         /* Ensure 32-byte alignment of our private data and hw private data.
 330          * We use the wiphy priv data for both our ieee80211_local and for
 331          * the driver's private data
 332          *
 333          * In memory it'll be like this:
 334          *
 335          * +-------------------------+
 336          * | struct wiphy           |
 337          * +-------------------------+
 338          * | struct ieee80211_local  |
 339          * +-------------------------+
 340          * | driver's private data   |
 341          * +-------------------------+
 342          *
 343          */
 344         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 345
 346         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 347
 348         if (!wiphy)
 349                 return NULL;
 350
 351         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 352                         WIPHY_FLAG_4ADDR_AP |
 353                         WIPHY_FLAG_4ADDR_STATION;
 354         wiphy->privid = mac80211_wiphy_privid;
 355
 356         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 357         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 358                                sizeof(struct cfg80211_bss);
 359
 360         local = wiphy_priv(wiphy);
 361
 362         local->hw.wiphy = wiphy;
 363
 364         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 365
 366         BUG_ON(!ops->tx);
 367         BUG_ON(!ops->start);
 368         BUG_ON(!ops->stop);
 369         BUG_ON(!ops->config);
 370         BUG_ON(!ops->add_interface);
 371         BUG_ON(!ops->remove_interface);
 372         BUG_ON(!ops->configure_filter);
 373         local->ops = ops;
 374
 375         /* set up some defaults */
 376         local->hw.queues = 1;
 377         local->hw.max_rates = 1;
 378         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 379         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 380         local->user_power_level = -1;
 381
 382         INIT_LIST_HEAD(&local->interfaces);
 383         mutex_init(&local->iflist_mtx);
 384         mutex_init(&local->scan_mtx);
 385
 386         spin_lock_init(&local->key_lock);
 387         spin_lock_init(&local->filter_lock);
 388         spin_lock_init(&local->queue_stop_reason_lock);
 389
 390         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 391
 392         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 393
 394         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 395         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 396         local->smps_mode = IEEE80211_SMPS_OFF;
 397
 398         INIT_WORK(&local->dynamic_ps_enable_work,
 399                   ieee80211_dynamic_ps_enable_work);
 400         INIT_WORK(&local->dynamic_ps_disable_work,
 401                   ieee80211_dynamic_ps_disable_work);
 402         setup_timer(&local->dynamic_ps_timer,
 403                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 404
 405         sta_info_init(local);
 406
 407         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 408                 skb_queue_head_init(&local->pending[i]);
 409         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 410                      (unsigned long)local);
 411
 412         tasklet_init(&local->tasklet,
 413                      ieee80211_tasklet_handler,
 414                      (unsigned long) local);
 415
 416         skb_queue_head_init(&local->skb_queue);
 417         skb_queue_head_init(&local->skb_queue_unreliable);
 418
 419         spin_lock_init(&local->ampdu_lock);
 420
 421         return local_to_hw(local);
 422 }
 423 EXPORT_SYMBOL(ieee80211_alloc_hw);
 424
 425 int ieee80211_register_hw(struct ieee80211_hw *hw)
 426 {
 427         struct ieee80211_local *local = hw_to_local(hw);
 428         int result;
 429         enum ieee80211_band band;
 430         int channels, i, j, max_bitrates;
 431         bool supp_ht;
 432         static const u32 cipher_suites[] = {
 433                 WLAN_CIPHER_SUITE_WEP40,
 434                 WLAN_CIPHER_SUITE_WEP104,
 435                 WLAN_CIPHER_SUITE_TKIP,
 436                 WLAN_CIPHER_SUITE_CCMP,
 437
 438                 /* keep last -- depends on hw flags! */
 439                 WLAN_CIPHER_SUITE_AES_CMAC
 440         };
 441
 442         /*
 443          * generic code guarantees at least one band,
 444          * set this very early because much code assumes
 445          * that hw.conf.channel is assigned
 446          */
 447         channels = 0;
 448         max_bitrates = 0;
 449         supp_ht = false;
 450         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 451                 struct ieee80211_supported_band *sband;
 452
 453                 sband = local->hw.wiphy->bands[band];
 454                 if (!sband)
 455                         continue;
 456                 if (!local->oper_channel) {
 457                         /* init channel we're on */
 458                         local->hw.conf.channel =
 459                         local->oper_channel = &sband->channels[0];
 460                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 461                 }
 462                 channels += sband->n_channels;
 463
 464                 if (max_bitrates < sband->n_bitrates)
 465                         max_bitrates = sband->n_bitrates;
 466                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 467         }
 468
 469         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 470                                       sizeof(void *) * channels, GFP_KERNEL);
 471         if (!local->int_scan_req)
 472                 return -ENOMEM;
 473
 474         /* if low-level driver supports AP, we also support VLAN */
 475         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 476                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 477
 478         /* mac80211 always supports monitor */
 479         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 480
 481         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 482                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 483         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 484                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 485
 486         /*
 487          * Calculate scan IE length -- we need this to alloc
 488          * memory and to subtract from the driver limit. It
 489          * includes the (extended) supported rates and HT
 490          * information -- SSID is the driver's responsibility.
 491          */
 492         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 493         if (supp_ht)
 494                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 495
 496         if (!local->ops->hw_scan) {
 497                 /* For hw_scan, driver needs to set these up. */
 498                 local->hw.wiphy->max_scan_ssids = 4;
 499                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 500         }
 501
 502         /*
 503          * If the driver supports any scan IEs, then assume the
 504          * limit includes the IEs mac80211 will add, otherwise
 505          * leave it at zero and let the driver sort it out; we
 506          * still pass our IEs to the driver but userspace will
 507          * not be allowed to in that case.
 508          */
 509         if (local->hw.wiphy->max_scan_ie_len)
 510                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 511
 512         local->hw.wiphy->cipher_suites = cipher_suites;
 513         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 514         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 515                 local->hw.wiphy->n_cipher_suites--;
 516
 517         result = wiphy_register(local->hw.wiphy);
 518         if (result < 0)
 519                 goto fail_wiphy_register;
 520
 521         /*
 522          * We use the number of queues for feature tests (QoS, HT) internally
 523          * so restrict them appropriately.
 524          */
 525         if (hw->queues > IEEE80211_MAX_QUEUES)
 526                 hw->queues = IEEE80211_MAX_QUEUES;
 527
 528         local->workqueue =
 529                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 530         if (!local->workqueue) {
 531                 result = -ENOMEM;
 532                 goto fail_workqueue;
 533         }
 534
 535         /*
 536          * The hardware needs headroom for sending the frame,
 537          * and we need some headroom for passing the frame to monitor
 538          * interfaces, but never both at the same time.
 539          */
 540         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 541                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 542
 543         debugfs_hw_add(local);
 544
 545         if (local->hw.max_listen_interval == 0)
 546                 local->hw.max_listen_interval = 1;
 547
 548         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 549
 550         result = sta_info_start(local);
 551         if (result < 0)
 552                 goto fail_sta_info;
 553
 554         result = ieee80211_wep_init(local);
 555         if (result < 0) {
 556                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 557                        wiphy_name(local->hw.wiphy), result);
 558                 goto fail_wep;
 559         }
 560
 561         rtnl_lock();
 562
 563         result = ieee80211_init_rate_ctrl_alg(local,
 564                                               hw->rate_control_algorithm);
 565         if (result < 0) {
 566                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 567                        "algorithm\n", wiphy_name(local->hw.wiphy));
 568                 goto fail_rate;
 569         }
 570
 571         /* add one default STA interface if supported */
 572         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 573                 result = ieee80211_if_add(local, "wlan%d", NULL,
 574                                           NL80211_IFTYPE_STATION, NULL);
 575                 if (result)
 576                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 577                                wiphy_name(local->hw.wiphy));
 578         }
 579
 580         rtnl_unlock();
 581
 582         ieee80211_led_init(local);
 583
 584         /* alloc internal scan request */
 585         i = 0;
 586         local->int_scan_req->ssids = &local->scan_ssid;
 587         local->int_scan_req->n_ssids = 1;
 588         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 589                 if (!hw->wiphy->bands[band])
 590                         continue;
 591                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 592                         local->int_scan_req->channels[i] =
 593                                 &hw->wiphy->bands[band]->channels[j];
 594                         i++;
 595                 }
 596         }
 597         local->int_scan_req->n_channels = i;
 598
 599         local->network_latency_notifier.notifier_call =
 600                 ieee80211_max_network_latency;
 601         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 602                                      &local->network_latency_notifier);
 603
 604         if (result) {
 605                 rtnl_lock();
 606                 goto fail_pm_qos;
 607         }
 608
 609         return 0;
 610
 611  fail_pm_qos:
 612         ieee80211_led_exit(local);
 613         ieee80211_remove_interfaces(local);
 614  fail_rate:
 615         rtnl_unlock();
 616         ieee80211_wep_free(local);
 617  fail_wep:
 618         sta_info_stop(local);
 619  fail_sta_info:
 620         destroy_workqueue(local->workqueue);
 621  fail_workqueue:
 622         wiphy_unregister(local->hw.wiphy);
 623  fail_wiphy_register:
 624         kfree(local->int_scan_req);
 625         return result;
 626 }
 627 EXPORT_SYMBOL(ieee80211_register_hw);
 628
 629 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 630 {
 631         struct ieee80211_local *local = hw_to_local(hw);
 632
 633         tasklet_kill(&local->tx_pending_tasklet);
 634         tasklet_kill(&local->tasklet);
 635
 636         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 637                                &local->network_latency_notifier);
 638
 639         rtnl_lock();
 640
 641         /*
 642          * At this point, interface list manipulations are fine
 643          * because the driver cannot be handing us frames any
 644          * more and the tasklet is killed.
 645          */
 646         ieee80211_remove_interfaces(local);
 647
 648         rtnl_unlock();
 649
 650         cancel_work_sync(&local->reconfig_filter);
 651
 652         ieee80211_clear_tx_pending(local);
 653         sta_info_stop(local);
 654         rate_control_deinitialize(local);
 655
 656         if (skb_queue_len(&local->skb_queue) ||
 657             skb_queue_len(&local->skb_queue_unreliable))
 658                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 659                        wiphy_name(local->hw.wiphy));
 660         skb_queue_purge(&local->skb_queue);
 661         skb_queue_purge(&local->skb_queue_unreliable);
 662
 663         destroy_workqueue(local->workqueue);
 664         wiphy_unregister(local->hw.wiphy);
 665         ieee80211_wep_free(local);
 666         ieee80211_led_exit(local);
 667         kfree(local->int_scan_req);
 668 }
 669 EXPORT_SYMBOL(ieee80211_unregister_hw);
 670
 671 void ieee80211_free_hw(struct ieee80211_hw *hw)
 672 {
 673         struct ieee80211_local *local = hw_to_local(hw);
 674
 675         mutex_destroy(&local->iflist_mtx);
 676         mutex_destroy(&local->scan_mtx);
 677
 678         wiphy_free(local->hw.wiphy);
 679 }
 680 EXPORT_SYMBOL(ieee80211_free_hw);
 681
 682 static int __init ieee80211_init(void)
 683 {
 684         struct sk_buff *skb;
 685         int ret;
 686
 687         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 688         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 689                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 690
 691         ret = rc80211_minstrel_init();
 692         if (ret)
 693                 return ret;
 694
 695         ret = rc80211_pid_init();
 696         if (ret)
 697                 goto err_pid;
 698
 699         ret = ieee80211_iface_init();
 700         if (ret)
 701                 goto err_netdev;
 702
 703         return 0;
 704  err_netdev:
 705         rc80211_pid_exit();
 706  err_pid:
 707         rc80211_minstrel_exit();
 708
 709         return ret;
 710 }
 711
 712 static void __exit ieee80211_exit(void)
 713 {
 714         rc80211_pid_exit();
 715         rc80211_minstrel_exit();
 716
 717         /*
 718          * For key todo, it'll be empty by now but the work
 719          * might still be scheduled.
 720          */
 721         flush_scheduled_work();
 722
 723         if (mesh_allocated)
 724                 ieee80211s_stop();
 725
 726         ieee80211_iface_exit();
 727 }
 728
 729
 730 subsys_initcall(ieee80211_init);
 731 module_exit(ieee80211_exit);
 732
 733 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 734 MODULE_LICENSE("GPL");