mac80211: enable spatial multiplexing powersave
[linux-2.6.git] / 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");