mac80211: Fix ps-qos network latency handling
[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/rtnetlink.h>
21 #include <linux/bitmap.h>
22 #include <linux/pm_qos_params.h>
23 #include <linux/inetdevice.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_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                                         !!sdata->u.ap.beacon;
230                                 break;
231                         case NL80211_IFTYPE_ADHOC:
232                                 sdata->vif.bss_conf.enable_beacon =
233                                         !!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
264         while ((skb = skb_dequeue(&local->skb_queue)) ||
265                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
266                 switch (skb->pkt_type) {
267                 case IEEE80211_RX_MSG:
268                         /* Clear skb->pkt_type in order to not confuse kernel
269                          * netstack. */
270                         skb->pkt_type = 0;
271                         ieee80211_rx(local_to_hw(local), skb);
272                         break;
273                 case IEEE80211_TX_STATUS_MSG:
274                         skb->pkt_type = 0;
275                         ieee80211_tx_status(local_to_hw(local), skb);
276                         break;
277                 default:
278                         WARN(1, "mac80211: Packet is of unknown type %d\n",
279                              skb->pkt_type);
280                         dev_kfree_skb(skb);
281                         break;
282                 }
283         }
284 }
285
286 static void ieee80211_restart_work(struct work_struct *work)
287 {
288         struct ieee80211_local *local =
289                 container_of(work, struct ieee80211_local, restart_work);
290
291         rtnl_lock();
292         ieee80211_reconfig(local);
293         rtnl_unlock();
294 }
295
296 void ieee80211_restart_hw(struct ieee80211_hw *hw)
297 {
298         struct ieee80211_local *local = hw_to_local(hw);
299
300         trace_api_restart_hw(local);
301
302         /* use this reason, __ieee80211_resume will unblock it */
303         ieee80211_stop_queues_by_reason(hw,
304                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
305
306         schedule_work(&local->restart_work);
307 }
308 EXPORT_SYMBOL(ieee80211_restart_hw);
309
310 static void ieee80211_recalc_smps_work(struct work_struct *work)
311 {
312         struct ieee80211_local *local =
313                 container_of(work, struct ieee80211_local, recalc_smps);
314
315         mutex_lock(&local->iflist_mtx);
316         ieee80211_recalc_smps(local, NULL);
317         mutex_unlock(&local->iflist_mtx);
318 }
319
320 #ifdef CONFIG_INET
321 static int ieee80211_ifa_changed(struct notifier_block *nb,
322                                  unsigned long data, void *arg)
323 {
324         struct in_ifaddr *ifa = arg;
325         struct ieee80211_local *local =
326                 container_of(nb, struct ieee80211_local,
327                              ifa_notifier);
328         struct net_device *ndev = ifa->ifa_dev->dev;
329         struct wireless_dev *wdev = ndev->ieee80211_ptr;
330         struct in_device *idev;
331         struct ieee80211_sub_if_data *sdata;
332         struct ieee80211_bss_conf *bss_conf;
333         struct ieee80211_if_managed *ifmgd;
334         int c = 0;
335
336         if (!netif_running(ndev))
337                 return NOTIFY_DONE;
338
339         /* Make sure it's our interface that got changed */
340         if (!wdev)
341                 return NOTIFY_DONE;
342
343         if (wdev->wiphy != local->hw.wiphy)
344                 return NOTIFY_DONE;
345
346         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
347         bss_conf = &sdata->vif.bss_conf;
348
349         /* ARP filtering is only supported in managed mode */
350         if (sdata->vif.type != NL80211_IFTYPE_STATION)
351                 return NOTIFY_DONE;
352
353         idev = sdata->dev->ip_ptr;
354         if (!idev)
355                 return NOTIFY_DONE;
356
357         ifmgd = &sdata->u.mgd;
358         mutex_lock(&ifmgd->mtx);
359
360         /* Copy the addresses to the bss_conf list */
361         ifa = idev->ifa_list;
362         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
363                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
364                 ifa = ifa->ifa_next;
365                 c++;
366         }
367
368         /* If not all addresses fit the list, disable filtering */
369         if (ifa) {
370                 sdata->arp_filter_state = false;
371                 c = 0;
372         } else {
373                 sdata->arp_filter_state = true;
374         }
375         bss_conf->arp_addr_cnt = c;
376
377         /* Configure driver only if associated */
378         if (ifmgd->associated) {
379                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
380                 ieee80211_bss_info_change_notify(sdata,
381                                                  BSS_CHANGED_ARP_FILTER);
382         }
383
384         mutex_unlock(&ifmgd->mtx);
385
386         return NOTIFY_DONE;
387 }
388 #endif
389
390 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
391                                         const struct ieee80211_ops *ops)
392 {
393         struct ieee80211_local *local;
394         int priv_size, i;
395         struct wiphy *wiphy;
396
397         /* Ensure 32-byte alignment of our private data and hw private data.
398          * We use the wiphy priv data for both our ieee80211_local and for
399          * the driver's private data
400          *
401          * In memory it'll be like this:
402          *
403          * +-------------------------+
404          * | struct wiphy           |
405          * +-------------------------+
406          * | struct ieee80211_local  |
407          * +-------------------------+
408          * | driver's private data   |
409          * +-------------------------+
410          *
411          */
412         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
413
414         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
415
416         if (!wiphy)
417                 return NULL;
418
419         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
420                         WIPHY_FLAG_4ADDR_AP |
421                         WIPHY_FLAG_4ADDR_STATION;
422         wiphy->privid = mac80211_wiphy_privid;
423
424         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
425
426         local = wiphy_priv(wiphy);
427
428         local->hw.wiphy = wiphy;
429
430         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
431
432         BUG_ON(!ops->tx);
433         BUG_ON(!ops->start);
434         BUG_ON(!ops->stop);
435         BUG_ON(!ops->config);
436         BUG_ON(!ops->add_interface);
437         BUG_ON(!ops->remove_interface);
438         BUG_ON(!ops->configure_filter);
439         local->ops = ops;
440
441         /* set up some defaults */
442         local->hw.queues = 1;
443         local->hw.max_rates = 1;
444         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
445         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
446         local->user_power_level = -1;
447         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
448         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
449
450         INIT_LIST_HEAD(&local->interfaces);
451
452         __hw_addr_init(&local->mc_list);
453
454         mutex_init(&local->iflist_mtx);
455         mutex_init(&local->scan_mtx);
456
457         mutex_init(&local->key_mtx);
458         spin_lock_init(&local->filter_lock);
459         spin_lock_init(&local->queue_stop_reason_lock);
460
461         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
462
463         ieee80211_work_init(local);
464
465         INIT_WORK(&local->restart_work, ieee80211_restart_work);
466
467         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
468         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
469         local->smps_mode = IEEE80211_SMPS_OFF;
470
471         INIT_WORK(&local->dynamic_ps_enable_work,
472                   ieee80211_dynamic_ps_enable_work);
473         INIT_WORK(&local->dynamic_ps_disable_work,
474                   ieee80211_dynamic_ps_disable_work);
475         setup_timer(&local->dynamic_ps_timer,
476                     ieee80211_dynamic_ps_timer, (unsigned long) local);
477
478         sta_info_init(local);
479
480         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
481                 skb_queue_head_init(&local->pending[i]);
482                 atomic_set(&local->agg_queue_stop[i], 0);
483         }
484         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
485                      (unsigned long)local);
486
487         tasklet_init(&local->tasklet,
488                      ieee80211_tasklet_handler,
489                      (unsigned long) local);
490
491         skb_queue_head_init(&local->skb_queue);
492         skb_queue_head_init(&local->skb_queue_unreliable);
493
494         return local_to_hw(local);
495 }
496 EXPORT_SYMBOL(ieee80211_alloc_hw);
497
498 int ieee80211_register_hw(struct ieee80211_hw *hw)
499 {
500         struct ieee80211_local *local = hw_to_local(hw);
501         int result;
502         enum ieee80211_band band;
503         int channels, max_bitrates;
504         bool supp_ht;
505         static const u32 cipher_suites[] = {
506                 WLAN_CIPHER_SUITE_WEP40,
507                 WLAN_CIPHER_SUITE_WEP104,
508                 WLAN_CIPHER_SUITE_TKIP,
509                 WLAN_CIPHER_SUITE_CCMP,
510
511                 /* keep last -- depends on hw flags! */
512                 WLAN_CIPHER_SUITE_AES_CMAC
513         };
514
515         /*
516          * generic code guarantees at least one band,
517          * set this very early because much code assumes
518          * that hw.conf.channel is assigned
519          */
520         channels = 0;
521         max_bitrates = 0;
522         supp_ht = false;
523         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
524                 struct ieee80211_supported_band *sband;
525
526                 sband = local->hw.wiphy->bands[band];
527                 if (!sband)
528                         continue;
529                 if (!local->oper_channel) {
530                         /* init channel we're on */
531                         local->hw.conf.channel =
532                         local->oper_channel = &sband->channels[0];
533                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
534                 }
535                 channels += sband->n_channels;
536
537                 if (max_bitrates < sband->n_bitrates)
538                         max_bitrates = sband->n_bitrates;
539                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
540         }
541
542         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
543                                       sizeof(void *) * channels, GFP_KERNEL);
544         if (!local->int_scan_req)
545                 return -ENOMEM;
546
547         /* if low-level driver supports AP, we also support VLAN */
548         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
549                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
550
551         /* mac80211 always supports monitor */
552         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
553
554         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
555                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
556         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
557                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
558
559         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
560              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
561              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
562
563         /*
564          * Calculate scan IE length -- we need this to alloc
565          * memory and to subtract from the driver limit. It
566          * includes the (extended) supported rates and HT
567          * information -- SSID is the driver's responsibility.
568          */
569         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
570         if (supp_ht)
571                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
572
573         if (!local->ops->hw_scan) {
574                 /* For hw_scan, driver needs to set these up. */
575                 local->hw.wiphy->max_scan_ssids = 4;
576                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
577         }
578
579         /*
580          * If the driver supports any scan IEs, then assume the
581          * limit includes the IEs mac80211 will add, otherwise
582          * leave it at zero and let the driver sort it out; we
583          * still pass our IEs to the driver but userspace will
584          * not be allowed to in that case.
585          */
586         if (local->hw.wiphy->max_scan_ie_len)
587                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
588
589         local->hw.wiphy->cipher_suites = cipher_suites;
590         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
591         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
592                 local->hw.wiphy->n_cipher_suites--;
593
594         result = wiphy_register(local->hw.wiphy);
595         if (result < 0)
596                 goto fail_wiphy_register;
597
598         /*
599          * We use the number of queues for feature tests (QoS, HT) internally
600          * so restrict them appropriately.
601          */
602         if (hw->queues > IEEE80211_MAX_QUEUES)
603                 hw->queues = IEEE80211_MAX_QUEUES;
604
605         local->workqueue =
606                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
607         if (!local->workqueue) {
608                 result = -ENOMEM;
609                 goto fail_workqueue;
610         }
611
612         /*
613          * The hardware needs headroom for sending the frame,
614          * and we need some headroom for passing the frame to monitor
615          * interfaces, but never both at the same time.
616          */
617         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
618                         sizeof(struct ieee80211_tx_status_rtap_hdr));
619         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
620                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
621
622         debugfs_hw_add(local);
623
624         /*
625          * if the driver doesn't specify a max listen interval we
626          * use 5 which should be a safe default
627          */
628         if (local->hw.max_listen_interval == 0)
629                 local->hw.max_listen_interval = 5;
630
631         local->hw.conf.listen_interval = local->hw.max_listen_interval;
632
633         local->dynamic_ps_forced_timeout = -1;
634
635         result = sta_info_start(local);
636         if (result < 0)
637                 goto fail_sta_info;
638
639         result = ieee80211_wep_init(local);
640         if (result < 0) {
641                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
642                        wiphy_name(local->hw.wiphy), result);
643                 goto fail_wep;
644         }
645
646         rtnl_lock();
647
648         result = ieee80211_init_rate_ctrl_alg(local,
649                                               hw->rate_control_algorithm);
650         if (result < 0) {
651                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
652                        "algorithm\n", wiphy_name(local->hw.wiphy));
653                 goto fail_rate;
654         }
655
656         /* add one default STA interface if supported */
657         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
658                 result = ieee80211_if_add(local, "wlan%d", NULL,
659                                           NL80211_IFTYPE_STATION, NULL);
660                 if (result)
661                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
662                                wiphy_name(local->hw.wiphy));
663         }
664
665         rtnl_unlock();
666
667         ieee80211_led_init(local);
668
669         local->network_latency_notifier.notifier_call =
670                 ieee80211_max_network_latency;
671         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
672                                      &local->network_latency_notifier);
673         if (result) {
674                 rtnl_lock();
675                 goto fail_pm_qos;
676         }
677
678 #ifdef CONFIG_INET
679         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
680         result = register_inetaddr_notifier(&local->ifa_notifier);
681         if (result)
682                 goto fail_ifa;
683 #endif
684
685         return 0;
686
687  fail_ifa:
688         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
689                                &local->network_latency_notifier);
690         rtnl_lock();
691  fail_pm_qos:
692         ieee80211_led_exit(local);
693         ieee80211_remove_interfaces(local);
694  fail_rate:
695         rtnl_unlock();
696         ieee80211_wep_free(local);
697  fail_wep:
698         sta_info_stop(local);
699  fail_sta_info:
700         destroy_workqueue(local->workqueue);
701  fail_workqueue:
702         wiphy_unregister(local->hw.wiphy);
703  fail_wiphy_register:
704         kfree(local->int_scan_req);
705         return result;
706 }
707 EXPORT_SYMBOL(ieee80211_register_hw);
708
709 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
710 {
711         struct ieee80211_local *local = hw_to_local(hw);
712
713         tasklet_kill(&local->tx_pending_tasklet);
714         tasklet_kill(&local->tasklet);
715
716         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
717                                &local->network_latency_notifier);
718 #ifdef CONFIG_INET
719         unregister_inetaddr_notifier(&local->ifa_notifier);
720 #endif
721
722         rtnl_lock();
723
724         /*
725          * At this point, interface list manipulations are fine
726          * because the driver cannot be handing us frames any
727          * more and the tasklet is killed.
728          */
729         ieee80211_remove_interfaces(local);
730
731         rtnl_unlock();
732
733         cancel_work_sync(&local->reconfig_filter);
734
735         ieee80211_clear_tx_pending(local);
736         sta_info_stop(local);
737         rate_control_deinitialize(local);
738
739         if (skb_queue_len(&local->skb_queue) ||
740             skb_queue_len(&local->skb_queue_unreliable))
741                 printk(KERN_WARNING "%s: skb_queue not empty\n",
742                        wiphy_name(local->hw.wiphy));
743         skb_queue_purge(&local->skb_queue);
744         skb_queue_purge(&local->skb_queue_unreliable);
745
746         destroy_workqueue(local->workqueue);
747         wiphy_unregister(local->hw.wiphy);
748         ieee80211_wep_free(local);
749         ieee80211_led_exit(local);
750         kfree(local->int_scan_req);
751 }
752 EXPORT_SYMBOL(ieee80211_unregister_hw);
753
754 void ieee80211_free_hw(struct ieee80211_hw *hw)
755 {
756         struct ieee80211_local *local = hw_to_local(hw);
757
758         mutex_destroy(&local->iflist_mtx);
759         mutex_destroy(&local->scan_mtx);
760
761         wiphy_free(local->hw.wiphy);
762 }
763 EXPORT_SYMBOL(ieee80211_free_hw);
764
765 static int __init ieee80211_init(void)
766 {
767         struct sk_buff *skb;
768         int ret;
769
770         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
771         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
772                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
773
774         ret = rc80211_minstrel_init();
775         if (ret)
776                 return ret;
777
778         ret = rc80211_minstrel_ht_init();
779         if (ret)
780                 goto err_minstrel;
781
782         ret = rc80211_pid_init();
783         if (ret)
784                 goto err_pid;
785
786         ret = ieee80211_iface_init();
787         if (ret)
788                 goto err_netdev;
789
790         return 0;
791  err_netdev:
792         rc80211_pid_exit();
793  err_pid:
794         rc80211_minstrel_ht_exit();
795  err_minstrel:
796         rc80211_minstrel_exit();
797
798         return ret;
799 }
800
801 static void __exit ieee80211_exit(void)
802 {
803         rc80211_pid_exit();
804         rc80211_minstrel_ht_exit();
805         rc80211_minstrel_exit();
806
807         /*
808          * For key todo, it'll be empty by now but the work
809          * might still be scheduled.
810          */
811         flush_scheduled_work();
812
813         if (mesh_allocated)
814                 ieee80211s_stop();
815
816         ieee80211_iface_exit();
817 }
818
819
820 subsys_initcall(ieee80211_init);
821 module_exit(ieee80211_exit);
822
823 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
824 MODULE_LICENSE("GPL");