drm/radeon/kms/pm: fix segfault in clock code
[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 #include "debugfs_netdev.h"
36
37 void ieee80211_configure_filter(struct ieee80211_local *local)
38 {
39         u64 mc;
40         unsigned int changed_flags;
41         unsigned int new_flags = 0;
42
43         if (atomic_read(&local->iff_promiscs))
44                 new_flags |= FIF_PROMISC_IN_BSS;
45
46         if (atomic_read(&local->iff_allmultis))
47                 new_flags |= FIF_ALLMULTI;
48
49         if (local->monitors || local->scanning)
50                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
51
52         if (local->fif_fcsfail)
53                 new_flags |= FIF_FCSFAIL;
54
55         if (local->fif_plcpfail)
56                 new_flags |= FIF_PLCPFAIL;
57
58         if (local->fif_control)
59                 new_flags |= FIF_CONTROL;
60
61         if (local->fif_other_bss)
62                 new_flags |= FIF_OTHER_BSS;
63
64         if (local->fif_pspoll)
65                 new_flags |= FIF_PSPOLL;
66
67         spin_lock_bh(&local->filter_lock);
68         changed_flags = local->filter_flags ^ new_flags;
69
70         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
71         spin_unlock_bh(&local->filter_lock);
72
73         /* be a bit nasty */
74         new_flags |= (1<<31);
75
76         drv_configure_filter(local, changed_flags, &new_flags, mc);
77
78         WARN_ON(new_flags & (1<<31));
79
80         local->filter_flags = new_flags & ~(1<<31);
81 }
82
83 static void ieee80211_reconfig_filter(struct work_struct *work)
84 {
85         struct ieee80211_local *local =
86                 container_of(work, struct ieee80211_local, reconfig_filter);
87
88         ieee80211_configure_filter(local);
89 }
90
91 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
92 {
93         struct ieee80211_channel *chan, *scan_chan;
94         int ret = 0;
95         int power;
96         enum nl80211_channel_type channel_type;
97
98         might_sleep();
99
100         scan_chan = local->scan_channel;
101
102         if (scan_chan) {
103                 chan = scan_chan;
104                 channel_type = NL80211_CHAN_NO_HT;
105         } else {
106                 chan = local->oper_channel;
107                 channel_type = local->oper_channel_type;
108         }
109
110         if (chan != local->hw.conf.channel ||
111             channel_type != local->hw.conf.channel_type) {
112                 local->hw.conf.channel = chan;
113                 local->hw.conf.channel_type = channel_type;
114                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
115         }
116
117         if (scan_chan)
118                 power = chan->max_power;
119         else
120                 power = local->power_constr_level ?
121                         (chan->max_power - local->power_constr_level) :
122                         chan->max_power;
123
124         if (local->user_power_level >= 0)
125                 power = min(power, local->user_power_level);
126
127         if (local->hw.conf.power_level != power) {
128                 changed |= IEEE80211_CONF_CHANGE_POWER;
129                 local->hw.conf.power_level = power;
130         }
131
132         if (changed && local->open_count) {
133                 ret = drv_config(local, changed);
134                 /*
135                  * Goal:
136                  * HW reconfiguration should never fail, the driver has told
137                  * us what it can support so it should live up to that promise.
138                  *
139                  * Current status:
140                  * rfkill is not integrated with mac80211 and a
141                  * configuration command can thus fail if hardware rfkill
142                  * is enabled
143                  *
144                  * FIXME: integrate rfkill with mac80211 and then add this
145                  * WARN_ON() back
146                  *
147                  */
148                 /* WARN_ON(ret); */
149         }
150
151         return ret;
152 }
153
154 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
155                                       u32 changed)
156 {
157         struct ieee80211_local *local = sdata->local;
158         static const u8 zero[ETH_ALEN] = { 0 };
159
160         if (!changed)
161                 return;
162
163         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
164                 /*
165                  * While not associated, claim a BSSID of all-zeroes
166                  * so that drivers don't do any weird things with the
167                  * BSSID at that time.
168                  */
169                 if (sdata->vif.bss_conf.assoc)
170                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
171                 else
172                         sdata->vif.bss_conf.bssid = zero;
173         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
174                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
175         else if (sdata->vif.type == NL80211_IFTYPE_AP)
176                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
177         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
178                 sdata->vif.bss_conf.bssid = zero;
179         } else {
180                 WARN_ON(1);
181                 return;
182         }
183
184         switch (sdata->vif.type) {
185         case NL80211_IFTYPE_AP:
186         case NL80211_IFTYPE_ADHOC:
187         case NL80211_IFTYPE_MESH_POINT:
188                 break;
189         default:
190                 /* do not warn to simplify caller in scan.c */
191                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
192                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
193                         return;
194                 break;
195         }
196
197         if (changed & BSS_CHANGED_BEACON_ENABLED) {
198                 if (local->quiescing || !netif_running(sdata->dev) ||
199                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
200                         sdata->vif.bss_conf.enable_beacon = false;
201                 } else {
202                         /*
203                          * Beacon should be enabled, but AP mode must
204                          * check whether there is a beacon configured.
205                          */
206                         switch (sdata->vif.type) {
207                         case NL80211_IFTYPE_AP:
208                                 sdata->vif.bss_conf.enable_beacon =
209                                         !!rcu_dereference(sdata->u.ap.beacon);
210                                 break;
211                         case NL80211_IFTYPE_ADHOC:
212                                 sdata->vif.bss_conf.enable_beacon =
213                                         !!rcu_dereference(sdata->u.ibss.presp);
214                                 break;
215                         case NL80211_IFTYPE_MESH_POINT:
216                                 sdata->vif.bss_conf.enable_beacon = true;
217                                 break;
218                         default:
219                                 /* not reached */
220                                 WARN_ON(1);
221                                 break;
222                         }
223                 }
224         }
225
226         drv_bss_info_changed(local, &sdata->vif,
227                              &sdata->vif.bss_conf, changed);
228 }
229
230 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
231 {
232         sdata->vif.bss_conf.use_cts_prot = false;
233         sdata->vif.bss_conf.use_short_preamble = false;
234         sdata->vif.bss_conf.use_short_slot = false;
235         return BSS_CHANGED_ERP_CTS_PROT |
236                BSS_CHANGED_ERP_PREAMBLE |
237                BSS_CHANGED_ERP_SLOT;
238 }
239
240 static void ieee80211_tasklet_handler(unsigned long data)
241 {
242         struct ieee80211_local *local = (struct ieee80211_local *) data;
243         struct sk_buff *skb;
244         struct ieee80211_ra_tid *ra_tid;
245
246         while ((skb = skb_dequeue(&local->skb_queue)) ||
247                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
248                 switch (skb->pkt_type) {
249                 case IEEE80211_RX_MSG:
250                         /* Clear skb->pkt_type in order to not confuse kernel
251                          * netstack. */
252                         skb->pkt_type = 0;
253                         ieee80211_rx(local_to_hw(local), skb);
254                         break;
255                 case IEEE80211_TX_STATUS_MSG:
256                         skb->pkt_type = 0;
257                         ieee80211_tx_status(local_to_hw(local), skb);
258                         break;
259                 case IEEE80211_DELBA_MSG:
260                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
261                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
262                                                 ra_tid->tid);
263                         dev_kfree_skb(skb);
264                         break;
265                 case IEEE80211_ADDBA_MSG:
266                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
267                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
268                                                  ra_tid->tid);
269                         dev_kfree_skb(skb);
270                         break ;
271                 default:
272                         WARN(1, "mac80211: Packet is of unknown type %d\n",
273                              skb->pkt_type);
274                         dev_kfree_skb(skb);
275                         break;
276                 }
277         }
278 }
279
280 static void ieee80211_restart_work(struct work_struct *work)
281 {
282         struct ieee80211_local *local =
283                 container_of(work, struct ieee80211_local, restart_work);
284
285         rtnl_lock();
286         ieee80211_reconfig(local);
287         rtnl_unlock();
288 }
289
290 void ieee80211_restart_hw(struct ieee80211_hw *hw)
291 {
292         struct ieee80211_local *local = hw_to_local(hw);
293
294         /* use this reason, __ieee80211_resume will unblock it */
295         ieee80211_stop_queues_by_reason(hw,
296                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
297
298         schedule_work(&local->restart_work);
299 }
300 EXPORT_SYMBOL(ieee80211_restart_hw);
301
302 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
303                                         const struct ieee80211_ops *ops)
304 {
305         struct ieee80211_local *local;
306         int priv_size, i;
307         struct wiphy *wiphy;
308
309         /* Ensure 32-byte alignment of our private data and hw private data.
310          * We use the wiphy priv data for both our ieee80211_local and for
311          * the driver's private data
312          *
313          * In memory it'll be like this:
314          *
315          * +-------------------------+
316          * | struct wiphy           |
317          * +-------------------------+
318          * | struct ieee80211_local  |
319          * +-------------------------+
320          * | driver's private data   |
321          * +-------------------------+
322          *
323          */
324         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
325
326         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
327
328         if (!wiphy)
329                 return NULL;
330
331         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
332                         WIPHY_FLAG_4ADDR_AP |
333                         WIPHY_FLAG_4ADDR_STATION;
334         wiphy->privid = mac80211_wiphy_privid;
335
336         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
337         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
338                                sizeof(struct cfg80211_bss);
339
340         local = wiphy_priv(wiphy);
341
342         local->hw.wiphy = wiphy;
343
344         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
345
346         BUG_ON(!ops->tx);
347         BUG_ON(!ops->start);
348         BUG_ON(!ops->stop);
349         BUG_ON(!ops->config);
350         BUG_ON(!ops->add_interface);
351         BUG_ON(!ops->remove_interface);
352         BUG_ON(!ops->configure_filter);
353         local->ops = ops;
354
355         /* set up some defaults */
356         local->hw.queues = 1;
357         local->hw.max_rates = 1;
358         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
359         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
360         local->user_power_level = -1;
361
362         INIT_LIST_HEAD(&local->interfaces);
363         mutex_init(&local->iflist_mtx);
364         mutex_init(&local->scan_mtx);
365
366         spin_lock_init(&local->key_lock);
367         spin_lock_init(&local->filter_lock);
368         spin_lock_init(&local->queue_stop_reason_lock);
369
370         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
371
372         INIT_WORK(&local->restart_work, ieee80211_restart_work);
373
374         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
375
376         INIT_WORK(&local->dynamic_ps_enable_work,
377                   ieee80211_dynamic_ps_enable_work);
378         INIT_WORK(&local->dynamic_ps_disable_work,
379                   ieee80211_dynamic_ps_disable_work);
380         setup_timer(&local->dynamic_ps_timer,
381                     ieee80211_dynamic_ps_timer, (unsigned long) local);
382
383         sta_info_init(local);
384
385         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
386                 skb_queue_head_init(&local->pending[i]);
387         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
388                      (unsigned long)local);
389
390         tasklet_init(&local->tasklet,
391                      ieee80211_tasklet_handler,
392                      (unsigned long) local);
393
394         skb_queue_head_init(&local->skb_queue);
395         skb_queue_head_init(&local->skb_queue_unreliable);
396
397         spin_lock_init(&local->ampdu_lock);
398
399         return local_to_hw(local);
400 }
401 EXPORT_SYMBOL(ieee80211_alloc_hw);
402
403 int ieee80211_register_hw(struct ieee80211_hw *hw)
404 {
405         struct ieee80211_local *local = hw_to_local(hw);
406         int result;
407         enum ieee80211_band band;
408         int channels, i, j, max_bitrates;
409         bool supp_ht;
410         static const u32 cipher_suites[] = {
411                 WLAN_CIPHER_SUITE_WEP40,
412                 WLAN_CIPHER_SUITE_WEP104,
413                 WLAN_CIPHER_SUITE_TKIP,
414                 WLAN_CIPHER_SUITE_CCMP,
415
416                 /* keep last -- depends on hw flags! */
417                 WLAN_CIPHER_SUITE_AES_CMAC
418         };
419
420         /*
421          * generic code guarantees at least one band,
422          * set this very early because much code assumes
423          * that hw.conf.channel is assigned
424          */
425         channels = 0;
426         max_bitrates = 0;
427         supp_ht = false;
428         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
429                 struct ieee80211_supported_band *sband;
430
431                 sband = local->hw.wiphy->bands[band];
432                 if (!sband)
433                         continue;
434                 if (!local->oper_channel) {
435                         /* init channel we're on */
436                         local->hw.conf.channel =
437                         local->oper_channel = &sband->channels[0];
438                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
439                 }
440                 channels += sband->n_channels;
441
442                 if (max_bitrates < sband->n_bitrates)
443                         max_bitrates = sband->n_bitrates;
444                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
445         }
446
447         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
448                                       sizeof(void *) * channels, GFP_KERNEL);
449         if (!local->int_scan_req)
450                 return -ENOMEM;
451
452         /* if low-level driver supports AP, we also support VLAN */
453         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
454                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
455
456         /* mac80211 always supports monitor */
457         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
458
459         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
460                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
461         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
462                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
463
464         /*
465          * Calculate scan IE length -- we need this to alloc
466          * memory and to subtract from the driver limit. It
467          * includes the (extended) supported rates and HT
468          * information -- SSID is the driver's responsibility.
469          */
470         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
471         if (supp_ht)
472                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
473
474         if (!local->ops->hw_scan) {
475                 /* For hw_scan, driver needs to set these up. */
476                 local->hw.wiphy->max_scan_ssids = 4;
477                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
478         }
479
480         /*
481          * If the driver supports any scan IEs, then assume the
482          * limit includes the IEs mac80211 will add, otherwise
483          * leave it at zero and let the driver sort it out; we
484          * still pass our IEs to the driver but userspace will
485          * not be allowed to in that case.
486          */
487         if (local->hw.wiphy->max_scan_ie_len)
488                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
489
490         local->hw.wiphy->cipher_suites = cipher_suites;
491         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
492         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
493                 local->hw.wiphy->n_cipher_suites--;
494
495         result = wiphy_register(local->hw.wiphy);
496         if (result < 0)
497                 goto fail_wiphy_register;
498
499         /*
500          * We use the number of queues for feature tests (QoS, HT) internally
501          * so restrict them appropriately.
502          */
503         if (hw->queues > IEEE80211_MAX_QUEUES)
504                 hw->queues = IEEE80211_MAX_QUEUES;
505
506         local->workqueue =
507                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
508         if (!local->workqueue) {
509                 result = -ENOMEM;
510                 goto fail_workqueue;
511         }
512
513         /*
514          * The hardware needs headroom for sending the frame,
515          * and we need some headroom for passing the frame to monitor
516          * interfaces, but never both at the same time.
517          */
518         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
519                         sizeof(struct ieee80211_tx_status_rtap_hdr));
520         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
521                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
522
523         debugfs_hw_add(local);
524
525         if (local->hw.max_listen_interval == 0)
526                 local->hw.max_listen_interval = 1;
527
528         local->hw.conf.listen_interval = local->hw.max_listen_interval;
529
530         result = sta_info_start(local);
531         if (result < 0)
532                 goto fail_sta_info;
533
534         result = ieee80211_wep_init(local);
535         if (result < 0) {
536                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
537                        wiphy_name(local->hw.wiphy), result);
538                 goto fail_wep;
539         }
540
541         rtnl_lock();
542
543         result = ieee80211_init_rate_ctrl_alg(local,
544                                               hw->rate_control_algorithm);
545         if (result < 0) {
546                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
547                        "algorithm\n", wiphy_name(local->hw.wiphy));
548                 goto fail_rate;
549         }
550
551         /* add one default STA interface if supported */
552         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
553                 result = ieee80211_if_add(local, "wlan%d", NULL,
554                                           NL80211_IFTYPE_STATION, NULL);
555                 if (result)
556                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
557                                wiphy_name(local->hw.wiphy));
558         }
559
560         rtnl_unlock();
561
562         ieee80211_led_init(local);
563
564         /* alloc internal scan request */
565         i = 0;
566         local->int_scan_req->ssids = &local->scan_ssid;
567         local->int_scan_req->n_ssids = 1;
568         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
569                 if (!hw->wiphy->bands[band])
570                         continue;
571                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
572                         local->int_scan_req->channels[i] =
573                                 &hw->wiphy->bands[band]->channels[j];
574                         i++;
575                 }
576         }
577         local->int_scan_req->n_channels = i;
578
579         local->network_latency_notifier.notifier_call =
580                 ieee80211_max_network_latency;
581         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
582                                      &local->network_latency_notifier);
583
584         if (result) {
585                 rtnl_lock();
586                 goto fail_pm_qos;
587         }
588
589         return 0;
590
591  fail_pm_qos:
592         ieee80211_led_exit(local);
593         ieee80211_remove_interfaces(local);
594  fail_rate:
595         rtnl_unlock();
596         ieee80211_wep_free(local);
597  fail_wep:
598         sta_info_stop(local);
599  fail_sta_info:
600         destroy_workqueue(local->workqueue);
601  fail_workqueue:
602         wiphy_unregister(local->hw.wiphy);
603  fail_wiphy_register:
604         kfree(local->int_scan_req);
605         return result;
606 }
607 EXPORT_SYMBOL(ieee80211_register_hw);
608
609 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
610 {
611         struct ieee80211_local *local = hw_to_local(hw);
612
613         tasklet_kill(&local->tx_pending_tasklet);
614         tasklet_kill(&local->tasklet);
615
616         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
617                                &local->network_latency_notifier);
618
619         rtnl_lock();
620
621         /*
622          * At this point, interface list manipulations are fine
623          * because the driver cannot be handing us frames any
624          * more and the tasklet is killed.
625          */
626         ieee80211_remove_interfaces(local);
627
628         rtnl_unlock();
629
630         cancel_work_sync(&local->reconfig_filter);
631
632         ieee80211_clear_tx_pending(local);
633         sta_info_stop(local);
634         rate_control_deinitialize(local);
635
636         if (skb_queue_len(&local->skb_queue) ||
637             skb_queue_len(&local->skb_queue_unreliable))
638                 printk(KERN_WARNING "%s: skb_queue not empty\n",
639                        wiphy_name(local->hw.wiphy));
640         skb_queue_purge(&local->skb_queue);
641         skb_queue_purge(&local->skb_queue_unreliable);
642
643         destroy_workqueue(local->workqueue);
644         wiphy_unregister(local->hw.wiphy);
645         ieee80211_wep_free(local);
646         ieee80211_led_exit(local);
647         kfree(local->int_scan_req);
648 }
649 EXPORT_SYMBOL(ieee80211_unregister_hw);
650
651 void ieee80211_free_hw(struct ieee80211_hw *hw)
652 {
653         struct ieee80211_local *local = hw_to_local(hw);
654
655         mutex_destroy(&local->iflist_mtx);
656         mutex_destroy(&local->scan_mtx);
657
658         wiphy_free(local->hw.wiphy);
659 }
660 EXPORT_SYMBOL(ieee80211_free_hw);
661
662 static int __init ieee80211_init(void)
663 {
664         struct sk_buff *skb;
665         int ret;
666
667         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
668         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
669                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
670
671         ret = rc80211_minstrel_init();
672         if (ret)
673                 return ret;
674
675         ret = rc80211_pid_init();
676         if (ret)
677                 return ret;
678
679         ieee80211_debugfs_netdev_init();
680
681         return 0;
682 }
683
684 static void __exit ieee80211_exit(void)
685 {
686         rc80211_pid_exit();
687         rc80211_minstrel_exit();
688
689         /*
690          * For key todo, it'll be empty by now but the work
691          * might still be scheduled.
692          */
693         flush_scheduled_work();
694
695         if (mesh_allocated)
696                 ieee80211s_stop();
697
698         ieee80211_debugfs_netdev_exit();
699 }
700
701
702 subsys_initcall(ieee80211_init);
703 module_exit(ieee80211_exit);
704
705 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
706 MODULE_LICENSE("GPL");