mac80211: refcount aggregation queue stop
[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 <net/net_namespace.h>
24 #include <net/cfg80211.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wep.h"
31 #include "led.h"
32 #include "cfg.h"
33 #include "debugfs.h"
34
35
36 bool ieee80211_disable_40mhz_24ghz;
37 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
38 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
39                  "Disable 40MHz support in the 2.4GHz band");
40
41 void ieee80211_configure_filter(struct ieee80211_local *local)
42 {
43         u64 mc;
44         unsigned int changed_flags;
45         unsigned int new_flags = 0;
46
47         if (atomic_read(&local->iff_promiscs))
48                 new_flags |= FIF_PROMISC_IN_BSS;
49
50         if (atomic_read(&local->iff_allmultis))
51                 new_flags |= FIF_ALLMULTI;
52
53         if (local->monitors || local->scanning)
54                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
55
56         if (local->fif_fcsfail)
57                 new_flags |= FIF_FCSFAIL;
58
59         if (local->fif_plcpfail)
60                 new_flags |= FIF_PLCPFAIL;
61
62         if (local->fif_control)
63                 new_flags |= FIF_CONTROL;
64
65         if (local->fif_other_bss)
66                 new_flags |= FIF_OTHER_BSS;
67
68         if (local->fif_pspoll)
69                 new_flags |= FIF_PSPOLL;
70
71         spin_lock_bh(&local->filter_lock);
72         changed_flags = local->filter_flags ^ new_flags;
73
74         mc = drv_prepare_multicast(local, &local->mc_list);
75         spin_unlock_bh(&local->filter_lock);
76
77         /* be a bit nasty */
78         new_flags |= (1<<31);
79
80         drv_configure_filter(local, changed_flags, &new_flags, mc);
81
82         WARN_ON(new_flags & (1<<31));
83
84         local->filter_flags = new_flags & ~(1<<31);
85 }
86
87 static void ieee80211_reconfig_filter(struct work_struct *work)
88 {
89         struct ieee80211_local *local =
90                 container_of(work, struct ieee80211_local, reconfig_filter);
91
92         ieee80211_configure_filter(local);
93 }
94
95 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
96 {
97         struct ieee80211_channel *chan, *scan_chan;
98         int ret = 0;
99         int power;
100         enum nl80211_channel_type channel_type;
101
102         might_sleep();
103
104         scan_chan = local->scan_channel;
105
106         if (scan_chan) {
107                 chan = scan_chan;
108                 channel_type = NL80211_CHAN_NO_HT;
109         } else if (local->tmp_channel) {
110                 chan = scan_chan = local->tmp_channel;
111                 channel_type = local->tmp_channel_type;
112         } else {
113                 chan = local->oper_channel;
114                 channel_type = local->_oper_channel_type;
115         }
116
117         if (chan != local->hw.conf.channel ||
118             channel_type != local->hw.conf.channel_type) {
119                 local->hw.conf.channel = chan;
120                 local->hw.conf.channel_type = channel_type;
121                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
122         }
123
124         if (!conf_is_ht(&local->hw.conf)) {
125                 /*
126                  * mac80211.h documents that this is only valid
127                  * when the channel is set to an HT type, and
128                  * that otherwise STATIC is used.
129                  */
130                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
131         } else if (local->hw.conf.smps_mode != local->smps_mode) {
132                 local->hw.conf.smps_mode = local->smps_mode;
133                 changed |= IEEE80211_CONF_CHANGE_SMPS;
134         }
135
136         if (scan_chan)
137                 power = chan->max_power;
138         else
139                 power = local->power_constr_level ?
140                         (chan->max_power - local->power_constr_level) :
141                         chan->max_power;
142
143         if (local->user_power_level >= 0)
144                 power = min(power, local->user_power_level);
145
146         if (local->hw.conf.power_level != power) {
147                 changed |= IEEE80211_CONF_CHANGE_POWER;
148                 local->hw.conf.power_level = power;
149         }
150
151         if (changed && local->open_count) {
152                 ret = drv_config(local, changed);
153                 /*
154                  * Goal:
155                  * HW reconfiguration should never fail, the driver has told
156                  * us what it can support so it should live up to that promise.
157                  *
158                  * Current status:
159                  * rfkill is not integrated with mac80211 and a
160                  * configuration command can thus fail if hardware rfkill
161                  * is enabled
162                  *
163                  * FIXME: integrate rfkill with mac80211 and then add this
164                  * WARN_ON() back
165                  *
166                  */
167                 /* WARN_ON(ret); */
168         }
169
170         return ret;
171 }
172
173 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
174                                       u32 changed)
175 {
176         struct ieee80211_local *local = sdata->local;
177         static const u8 zero[ETH_ALEN] = { 0 };
178
179         if (!changed)
180                 return;
181
182         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
183                 /*
184                  * While not associated, claim a BSSID of all-zeroes
185                  * so that drivers don't do any weird things with the
186                  * BSSID at that time.
187                  */
188                 if (sdata->vif.bss_conf.assoc)
189                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
190                 else
191                         sdata->vif.bss_conf.bssid = zero;
192         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
193                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
194         else if (sdata->vif.type == NL80211_IFTYPE_AP)
195                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
196         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
197                 sdata->vif.bss_conf.bssid = zero;
198         } else {
199                 WARN_ON(1);
200                 return;
201         }
202
203         switch (sdata->vif.type) {
204         case NL80211_IFTYPE_AP:
205         case NL80211_IFTYPE_ADHOC:
206         case NL80211_IFTYPE_MESH_POINT:
207                 break;
208         default:
209                 /* do not warn to simplify caller in scan.c */
210                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
211                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
212                         return;
213                 break;
214         }
215
216         if (changed & BSS_CHANGED_BEACON_ENABLED) {
217                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
218                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
219                         sdata->vif.bss_conf.enable_beacon = false;
220                 } else {
221                         /*
222                          * Beacon should be enabled, but AP mode must
223                          * check whether there is a beacon configured.
224                          */
225                         switch (sdata->vif.type) {
226                         case NL80211_IFTYPE_AP:
227                                 sdata->vif.bss_conf.enable_beacon =
228                                         !!sdata->u.ap.beacon;
229                                 break;
230                         case NL80211_IFTYPE_ADHOC:
231                                 sdata->vif.bss_conf.enable_beacon =
232                                         !!sdata->u.ibss.presp;
233                                 break;
234                         case NL80211_IFTYPE_MESH_POINT:
235                                 sdata->vif.bss_conf.enable_beacon = true;
236                                 break;
237                         default:
238                                 /* not reached */
239                                 WARN_ON(1);
240                                 break;
241                         }
242                 }
243         }
244
245         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
246 }
247
248 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
249 {
250         sdata->vif.bss_conf.use_cts_prot = false;
251         sdata->vif.bss_conf.use_short_preamble = false;
252         sdata->vif.bss_conf.use_short_slot = false;
253         return BSS_CHANGED_ERP_CTS_PROT |
254                BSS_CHANGED_ERP_PREAMBLE |
255                BSS_CHANGED_ERP_SLOT;
256 }
257
258 static void ieee80211_tasklet_handler(unsigned long data)
259 {
260         struct ieee80211_local *local = (struct ieee80211_local *) data;
261         struct sk_buff *skb;
262
263         while ((skb = skb_dequeue(&local->skb_queue)) ||
264                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
265                 switch (skb->pkt_type) {
266                 case IEEE80211_RX_MSG:
267                         /* Clear skb->pkt_type in order to not confuse kernel
268                          * netstack. */
269                         skb->pkt_type = 0;
270                         ieee80211_rx(local_to_hw(local), skb);
271                         break;
272                 case IEEE80211_TX_STATUS_MSG:
273                         skb->pkt_type = 0;
274                         ieee80211_tx_status(local_to_hw(local), skb);
275                         break;
276                 default:
277                         WARN(1, "mac80211: Packet is of unknown type %d\n",
278                              skb->pkt_type);
279                         dev_kfree_skb(skb);
280                         break;
281                 }
282         }
283 }
284
285 static void ieee80211_restart_work(struct work_struct *work)
286 {
287         struct ieee80211_local *local =
288                 container_of(work, struct ieee80211_local, restart_work);
289
290         rtnl_lock();
291         ieee80211_reconfig(local);
292         rtnl_unlock();
293 }
294
295 void ieee80211_restart_hw(struct ieee80211_hw *hw)
296 {
297         struct ieee80211_local *local = hw_to_local(hw);
298
299         trace_api_restart_hw(local);
300
301         /* use this reason, __ieee80211_resume will unblock it */
302         ieee80211_stop_queues_by_reason(hw,
303                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
304
305         schedule_work(&local->restart_work);
306 }
307 EXPORT_SYMBOL(ieee80211_restart_hw);
308
309 static void ieee80211_recalc_smps_work(struct work_struct *work)
310 {
311         struct ieee80211_local *local =
312                 container_of(work, struct ieee80211_local, recalc_smps);
313
314         mutex_lock(&local->iflist_mtx);
315         ieee80211_recalc_smps(local, NULL);
316         mutex_unlock(&local->iflist_mtx);
317 }
318
319 #ifdef CONFIG_INET
320 int ieee80211_set_arp_filter(struct ieee80211_sub_if_data *sdata)
321 {
322         struct in_device *idev;
323         int ret = 0;
324
325         BUG_ON(!sdata);
326         ASSERT_RTNL();
327
328         idev = sdata->dev->ip_ptr;
329         if (!idev)
330                 return 0;
331
332         ret = drv_configure_arp_filter(sdata->local, &sdata->vif,
333                                        idev->ifa_list);
334         return ret;
335 }
336
337 static int ieee80211_ifa_changed(struct notifier_block *nb,
338                                  unsigned long data, void *arg)
339 {
340         struct in_ifaddr *ifa = arg;
341         struct ieee80211_local *local =
342                 container_of(nb, struct ieee80211_local,
343                              ifa_notifier);
344         struct net_device *ndev = ifa->ifa_dev->dev;
345         struct wireless_dev *wdev = ndev->ieee80211_ptr;
346         struct ieee80211_sub_if_data *sdata;
347         struct ieee80211_if_managed *ifmgd;
348
349         if (!netif_running(ndev))
350                 return NOTIFY_DONE;
351
352         /* Make sure it's our interface that got changed */
353         if (!wdev)
354                 return NOTIFY_DONE;
355
356         if (wdev->wiphy != local->hw.wiphy)
357                 return NOTIFY_DONE;
358
359         /* We are concerned about IP addresses only when associated */
360         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
361
362         /* ARP filtering is only supported in managed mode */
363         if (sdata->vif.type != NL80211_IFTYPE_STATION)
364                 return NOTIFY_DONE;
365
366         ifmgd = &sdata->u.mgd;
367         mutex_lock(&ifmgd->mtx);
368         if (ifmgd->associated)
369                 ieee80211_set_arp_filter(sdata);
370         mutex_unlock(&ifmgd->mtx);
371
372         return NOTIFY_DONE;
373 }
374 #endif
375
376 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
377                                         const struct ieee80211_ops *ops)
378 {
379         struct ieee80211_local *local;
380         int priv_size, i;
381         struct wiphy *wiphy;
382
383         /* Ensure 32-byte alignment of our private data and hw private data.
384          * We use the wiphy priv data for both our ieee80211_local and for
385          * the driver's private data
386          *
387          * In memory it'll be like this:
388          *
389          * +-------------------------+
390          * | struct wiphy           |
391          * +-------------------------+
392          * | struct ieee80211_local  |
393          * +-------------------------+
394          * | driver's private data   |
395          * +-------------------------+
396          *
397          */
398         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
399
400         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
401
402         if (!wiphy)
403                 return NULL;
404
405         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
406                         WIPHY_FLAG_4ADDR_AP |
407                         WIPHY_FLAG_4ADDR_STATION;
408         wiphy->privid = mac80211_wiphy_privid;
409
410         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
411
412         local = wiphy_priv(wiphy);
413
414         local->hw.wiphy = wiphy;
415
416         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
417
418         BUG_ON(!ops->tx);
419         BUG_ON(!ops->start);
420         BUG_ON(!ops->stop);
421         BUG_ON(!ops->config);
422         BUG_ON(!ops->add_interface);
423         BUG_ON(!ops->remove_interface);
424         BUG_ON(!ops->configure_filter);
425         local->ops = ops;
426
427         /* set up some defaults */
428         local->hw.queues = 1;
429         local->hw.max_rates = 1;
430         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
431         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
432         local->user_power_level = -1;
433         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
434         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
435
436         INIT_LIST_HEAD(&local->interfaces);
437
438         __hw_addr_init(&local->mc_list);
439
440         mutex_init(&local->iflist_mtx);
441         mutex_init(&local->scan_mtx);
442
443         mutex_init(&local->key_mtx);
444         spin_lock_init(&local->filter_lock);
445         spin_lock_init(&local->queue_stop_reason_lock);
446
447         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
448
449         ieee80211_work_init(local);
450
451         INIT_WORK(&local->restart_work, ieee80211_restart_work);
452
453         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
454         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
455         local->smps_mode = IEEE80211_SMPS_OFF;
456
457         INIT_WORK(&local->dynamic_ps_enable_work,
458                   ieee80211_dynamic_ps_enable_work);
459         INIT_WORK(&local->dynamic_ps_disable_work,
460                   ieee80211_dynamic_ps_disable_work);
461         setup_timer(&local->dynamic_ps_timer,
462                     ieee80211_dynamic_ps_timer, (unsigned long) local);
463
464         sta_info_init(local);
465
466         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
467                 skb_queue_head_init(&local->pending[i]);
468                 atomic_set(&local->agg_queue_stop[i], 0);
469         }
470         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
471                      (unsigned long)local);
472
473         tasklet_init(&local->tasklet,
474                      ieee80211_tasklet_handler,
475                      (unsigned long) local);
476
477         skb_queue_head_init(&local->skb_queue);
478         skb_queue_head_init(&local->skb_queue_unreliable);
479
480         return local_to_hw(local);
481 }
482 EXPORT_SYMBOL(ieee80211_alloc_hw);
483
484 int ieee80211_register_hw(struct ieee80211_hw *hw)
485 {
486         struct ieee80211_local *local = hw_to_local(hw);
487         int result;
488         enum ieee80211_band band;
489         int channels, max_bitrates;
490         bool supp_ht;
491         static const u32 cipher_suites[] = {
492                 WLAN_CIPHER_SUITE_WEP40,
493                 WLAN_CIPHER_SUITE_WEP104,
494                 WLAN_CIPHER_SUITE_TKIP,
495                 WLAN_CIPHER_SUITE_CCMP,
496
497                 /* keep last -- depends on hw flags! */
498                 WLAN_CIPHER_SUITE_AES_CMAC
499         };
500
501         /*
502          * generic code guarantees at least one band,
503          * set this very early because much code assumes
504          * that hw.conf.channel is assigned
505          */
506         channels = 0;
507         max_bitrates = 0;
508         supp_ht = false;
509         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
510                 struct ieee80211_supported_band *sband;
511
512                 sband = local->hw.wiphy->bands[band];
513                 if (!sband)
514                         continue;
515                 if (!local->oper_channel) {
516                         /* init channel we're on */
517                         local->hw.conf.channel =
518                         local->oper_channel = &sband->channels[0];
519                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
520                 }
521                 channels += sband->n_channels;
522
523                 if (max_bitrates < sband->n_bitrates)
524                         max_bitrates = sband->n_bitrates;
525                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
526         }
527
528         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
529                                       sizeof(void *) * channels, GFP_KERNEL);
530         if (!local->int_scan_req)
531                 return -ENOMEM;
532
533         /* if low-level driver supports AP, we also support VLAN */
534         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
535                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
536
537         /* mac80211 always supports monitor */
538         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
539
540         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
541                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
542         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
543                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
544
545         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
546              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
547              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
548
549         /*
550          * Calculate scan IE length -- we need this to alloc
551          * memory and to subtract from the driver limit. It
552          * includes the (extended) supported rates and HT
553          * information -- SSID is the driver's responsibility.
554          */
555         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
556         if (supp_ht)
557                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
558
559         if (!local->ops->hw_scan) {
560                 /* For hw_scan, driver needs to set these up. */
561                 local->hw.wiphy->max_scan_ssids = 4;
562                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
563         }
564
565         /*
566          * If the driver supports any scan IEs, then assume the
567          * limit includes the IEs mac80211 will add, otherwise
568          * leave it at zero and let the driver sort it out; we
569          * still pass our IEs to the driver but userspace will
570          * not be allowed to in that case.
571          */
572         if (local->hw.wiphy->max_scan_ie_len)
573                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
574
575         local->hw.wiphy->cipher_suites = cipher_suites;
576         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
577         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
578                 local->hw.wiphy->n_cipher_suites--;
579
580         result = wiphy_register(local->hw.wiphy);
581         if (result < 0)
582                 goto fail_wiphy_register;
583
584         /*
585          * We use the number of queues for feature tests (QoS, HT) internally
586          * so restrict them appropriately.
587          */
588         if (hw->queues > IEEE80211_MAX_QUEUES)
589                 hw->queues = IEEE80211_MAX_QUEUES;
590
591         local->workqueue =
592                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
593         if (!local->workqueue) {
594                 result = -ENOMEM;
595                 goto fail_workqueue;
596         }
597
598         /*
599          * The hardware needs headroom for sending the frame,
600          * and we need some headroom for passing the frame to monitor
601          * interfaces, but never both at the same time.
602          */
603         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
604                         sizeof(struct ieee80211_tx_status_rtap_hdr));
605         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
606                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
607
608         debugfs_hw_add(local);
609
610         /*
611          * if the driver doesn't specify a max listen interval we
612          * use 5 which should be a safe default
613          */
614         if (local->hw.max_listen_interval == 0)
615                 local->hw.max_listen_interval = 5;
616
617         local->hw.conf.listen_interval = local->hw.max_listen_interval;
618
619         local->hw.conf.dynamic_ps_forced_timeout = -1;
620
621         result = sta_info_start(local);
622         if (result < 0)
623                 goto fail_sta_info;
624
625         result = ieee80211_wep_init(local);
626         if (result < 0) {
627                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
628                        wiphy_name(local->hw.wiphy), result);
629                 goto fail_wep;
630         }
631
632         rtnl_lock();
633
634         result = ieee80211_init_rate_ctrl_alg(local,
635                                               hw->rate_control_algorithm);
636         if (result < 0) {
637                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
638                        "algorithm\n", wiphy_name(local->hw.wiphy));
639                 goto fail_rate;
640         }
641
642         /* add one default STA interface if supported */
643         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
644                 result = ieee80211_if_add(local, "wlan%d", NULL,
645                                           NL80211_IFTYPE_STATION, NULL);
646                 if (result)
647                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
648                                wiphy_name(local->hw.wiphy));
649         }
650
651         rtnl_unlock();
652
653         ieee80211_led_init(local);
654
655         local->network_latency_notifier.notifier_call =
656                 ieee80211_max_network_latency;
657         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
658                                      &local->network_latency_notifier);
659         if (result) {
660                 rtnl_lock();
661                 goto fail_pm_qos;
662         }
663
664 #ifdef CONFIG_INET
665         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
666         result = register_inetaddr_notifier(&local->ifa_notifier);
667         if (result)
668                 goto fail_ifa;
669 #endif
670
671         return 0;
672
673  fail_ifa:
674         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
675                                &local->network_latency_notifier);
676         rtnl_lock();
677  fail_pm_qos:
678         ieee80211_led_exit(local);
679         ieee80211_remove_interfaces(local);
680  fail_rate:
681         rtnl_unlock();
682         ieee80211_wep_free(local);
683  fail_wep:
684         sta_info_stop(local);
685  fail_sta_info:
686         destroy_workqueue(local->workqueue);
687  fail_workqueue:
688         wiphy_unregister(local->hw.wiphy);
689  fail_wiphy_register:
690         kfree(local->int_scan_req);
691         return result;
692 }
693 EXPORT_SYMBOL(ieee80211_register_hw);
694
695 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
696 {
697         struct ieee80211_local *local = hw_to_local(hw);
698
699         tasklet_kill(&local->tx_pending_tasklet);
700         tasklet_kill(&local->tasklet);
701
702         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
703                                &local->network_latency_notifier);
704 #ifdef CONFIG_INET
705         unregister_inetaddr_notifier(&local->ifa_notifier);
706 #endif
707
708         rtnl_lock();
709
710         /*
711          * At this point, interface list manipulations are fine
712          * because the driver cannot be handing us frames any
713          * more and the tasklet is killed.
714          */
715         ieee80211_remove_interfaces(local);
716
717         rtnl_unlock();
718
719         cancel_work_sync(&local->reconfig_filter);
720
721         ieee80211_clear_tx_pending(local);
722         sta_info_stop(local);
723         rate_control_deinitialize(local);
724
725         if (skb_queue_len(&local->skb_queue) ||
726             skb_queue_len(&local->skb_queue_unreliable))
727                 printk(KERN_WARNING "%s: skb_queue not empty\n",
728                        wiphy_name(local->hw.wiphy));
729         skb_queue_purge(&local->skb_queue);
730         skb_queue_purge(&local->skb_queue_unreliable);
731
732         destroy_workqueue(local->workqueue);
733         wiphy_unregister(local->hw.wiphy);
734         ieee80211_wep_free(local);
735         ieee80211_led_exit(local);
736         kfree(local->int_scan_req);
737 }
738 EXPORT_SYMBOL(ieee80211_unregister_hw);
739
740 void ieee80211_free_hw(struct ieee80211_hw *hw)
741 {
742         struct ieee80211_local *local = hw_to_local(hw);
743
744         mutex_destroy(&local->iflist_mtx);
745         mutex_destroy(&local->scan_mtx);
746
747         wiphy_free(local->hw.wiphy);
748 }
749 EXPORT_SYMBOL(ieee80211_free_hw);
750
751 static int __init ieee80211_init(void)
752 {
753         struct sk_buff *skb;
754         int ret;
755
756         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
757         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
758                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
759
760         ret = rc80211_minstrel_init();
761         if (ret)
762                 return ret;
763
764         ret = rc80211_minstrel_ht_init();
765         if (ret)
766                 goto err_minstrel;
767
768         ret = rc80211_pid_init();
769         if (ret)
770                 goto err_pid;
771
772         ret = ieee80211_iface_init();
773         if (ret)
774                 goto err_netdev;
775
776         return 0;
777  err_netdev:
778         rc80211_pid_exit();
779  err_pid:
780         rc80211_minstrel_ht_exit();
781  err_minstrel:
782         rc80211_minstrel_exit();
783
784         return ret;
785 }
786
787 static void __exit ieee80211_exit(void)
788 {
789         rc80211_pid_exit();
790         rc80211_minstrel_ht_exit();
791         rc80211_minstrel_exit();
792
793         /*
794          * For key todo, it'll be empty by now but the work
795          * might still be scheduled.
796          */
797         flush_scheduled_work();
798
799         if (mesh_allocated)
800                 ieee80211s_stop();
801
802         ieee80211_iface_exit();
803 }
804
805
806 subsys_initcall(ieee80211_init);
807 module_exit(ieee80211_exit);
808
809 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
810 MODULE_LICENSE("GPL");