blob: 0c2a29484c07cdaaaf716b1f5ba0184d1047ee68 [file] [log] [blame]
Jouni Malinenb203ffc2009-12-23 13:15:40 +01001/*
2 * Off-channel operation helpers
3 *
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040015#include <linux/export.h>
Jouni Malinenb203ffc2009-12-23 13:15:40 +010016#include <net/mac80211.h>
17#include "ieee80211_i.h"
Johannes Berg2eb278e2012-06-05 14:28:42 +020018#include "driver-ops.h"
Jouni Malinenb203ffc2009-12-23 13:15:40 +010019
20/*
Ben Greearb23b0252011-02-04 11:54:17 -080021 * Tell our hardware to disable PS.
22 * Optionally inform AP that we will go to sleep so that it will buffer
23 * the frames while we are doing off-channel work. This is optional
24 * because we *may* be doing work on-operating channel, and want our
25 * hardware unconditionally awake, but still let the AP send us normal frames.
Jouni Malinenb203ffc2009-12-23 13:15:40 +010026 */
Rajkumar Manoharan559cef92012-06-18 19:03:52 +053027static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata)
Jouni Malinenb203ffc2009-12-23 13:15:40 +010028{
29 struct ieee80211_local *local = sdata->local;
Luis R. Rodriguez4730d592010-09-16 15:12:31 -040030 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
Jouni Malinenb203ffc2009-12-23 13:15:40 +010031
32 local->offchannel_ps_enabled = false;
33
34 /* FIXME: what to do when local->pspolling is true? */
35
36 del_timer_sync(&local->dynamic_ps_timer);
Luis R. Rodriguez3bc3c0d2010-09-16 15:12:33 -040037 del_timer_sync(&ifmgd->bcn_mon_timer);
Luis R. Rodriguez4730d592010-09-16 15:12:31 -040038 del_timer_sync(&ifmgd->conn_mon_timer);
39
Jouni Malinenb203ffc2009-12-23 13:15:40 +010040 cancel_work_sync(&local->dynamic_ps_enable_work);
41
42 if (local->hw.conf.flags & IEEE80211_CONF_PS) {
43 local->offchannel_ps_enabled = true;
44 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
45 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
46 }
47
Rajkumar Manoharan559cef92012-06-18 19:03:52 +053048 if (!local->offchannel_ps_enabled ||
49 !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
Jouni Malinenb203ffc2009-12-23 13:15:40 +010050 /*
51 * If power save was enabled, no need to send a nullfunc
52 * frame because AP knows that we are sleeping. But if the
53 * hardware is creating the nullfunc frame for power save
54 * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
55 * enabled) and power save was enabled, the firmware just
56 * sent a null frame with power save disabled. So we need
57 * to send a new nullfunc frame to inform the AP that we
58 * are again sleeping.
59 */
60 ieee80211_send_nullfunc(local, sdata, 1);
61}
62
63/* inform AP that we are awake again, unless power save is enabled */
64static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata)
65{
66 struct ieee80211_local *local = sdata->local;
67
68 if (!local->ps_sdata)
69 ieee80211_send_nullfunc(local, sdata, 0);
70 else if (local->offchannel_ps_enabled) {
71 /*
72 * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
73 * will send a nullfunc frame with the powersave bit set
74 * even though the AP already knows that we are sleeping.
75 * This could be avoided by sending a null frame with power
76 * save bit disabled before enabling the power save, but
77 * this doesn't gain anything.
78 *
79 * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
80 * to send a nullfunc frame because AP already knows that
81 * we are sleeping, let's just enable power save mode in
82 * hardware.
83 */
Ben Greearb23b0252011-02-04 11:54:17 -080084 /* TODO: Only set hardware if CONF_PS changed?
85 * TODO: Should we set offchannel_ps_enabled to false?
86 */
Jouni Malinenb203ffc2009-12-23 13:15:40 +010087 local->hw.conf.flags |= IEEE80211_CONF_PS;
88 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
89 } else if (local->hw.conf.dynamic_ps_timeout > 0) {
90 /*
91 * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
92 * had been running before leaving the operating channel,
93 * restart the timer now and send a nullfunc frame to inform
94 * the AP that we are awake.
95 */
96 ieee80211_send_nullfunc(local, sdata, 0);
97 mod_timer(&local->dynamic_ps_timer, jiffies +
98 msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
99 }
Luis R. Rodriguez4730d592010-09-16 15:12:31 -0400100
Luis R. Rodriguez3bc3c0d2010-09-16 15:12:33 -0400101 ieee80211_sta_reset_beacon_monitor(sdata);
Luis R. Rodriguez4730d592010-09-16 15:12:31 -0400102 ieee80211_sta_reset_conn_monitor(sdata);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100103}
104
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100105void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local)
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100106{
107 struct ieee80211_sub_if_data *sdata;
108
Johannes Bergfe57d9f2012-07-26 14:55:08 +0200109 if (WARN_ON(local->use_chanctx))
110 return;
111
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100112 /*
Ben Greearb23b0252011-02-04 11:54:17 -0800113 * notify the AP about us leaving the channel and stop all
114 * STA interfaces.
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100115 */
Seth Forshee6c17b772013-02-11 11:21:07 -0600116
Seth Forshee9c35d7d2013-02-11 11:21:08 -0600117 /*
118 * Stop queues and transmit all frames queued by the driver
119 * before sending nullfunc to enable powersave at the AP.
120 */
Johannes Berg445ea4e2013-02-13 12:25:28 +0100121 ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
Seth Forshee6c17b772013-02-11 11:21:07 -0600122 IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL);
Johannes Berg39ecc012013-02-13 12:11:00 +0100123 ieee80211_flush_queues(local, NULL);
Seth Forshee6c17b772013-02-11 11:21:07 -0600124
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100125 mutex_lock(&local->iflist_mtx);
126 list_for_each_entry(sdata, &local->interfaces, list) {
127 if (!ieee80211_sdata_running(sdata))
128 continue;
129
Johannes Bergf142c6b2012-06-18 20:07:15 +0200130 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
131 continue;
132
Ben Greearb23b0252011-02-04 11:54:17 -0800133 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
Johannes Berg5b714c62010-08-27 13:45:28 +0200134 set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
Ben Greearb23b0252011-02-04 11:54:17 -0800135
136 /* Check to see if we should disable beaconing. */
Johannes Bergd6a83222012-12-14 14:06:28 +0100137 if (sdata->vif.bss_conf.enable_beacon) {
138 set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
139 &sdata->state);
140 sdata->vif.bss_conf.enable_beacon = false;
Ben Greearb23b0252011-02-04 11:54:17 -0800141 ieee80211_bss_info_change_notify(
142 sdata, BSS_CHANGED_BEACON_ENABLED);
Johannes Bergd6a83222012-12-14 14:06:28 +0100143 }
Ben Greearb23b0252011-02-04 11:54:17 -0800144
Seth Forshee6c17b772013-02-11 11:21:07 -0600145 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
146 sdata->u.mgd.associated)
147 ieee80211_offchannel_ps_enable(sdata);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100148 }
149 mutex_unlock(&local->iflist_mtx);
150}
151
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100152void ieee80211_offchannel_return(struct ieee80211_local *local)
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100153{
154 struct ieee80211_sub_if_data *sdata;
155
Johannes Bergfe57d9f2012-07-26 14:55:08 +0200156 if (WARN_ON(local->use_chanctx))
157 return;
158
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100159 mutex_lock(&local->iflist_mtx);
160 list_for_each_entry(sdata, &local->interfaces, list) {
Johannes Bergf142c6b2012-06-18 20:07:15 +0200161 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
162 continue;
163
Eliad Pellerf6e8cb72011-12-23 01:48:06 +0200164 if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
165 clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
166
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100167 if (!ieee80211_sdata_running(sdata))
168 continue;
169
170 /* Tell AP we're back */
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100171 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
172 sdata->u.mgd.associated)
173 ieee80211_offchannel_ps_disable(sdata);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100174
Johannes Bergd6a83222012-12-14 14:06:28 +0100175 if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED,
176 &sdata->state)) {
177 sdata->vif.bss_conf.enable_beacon = true;
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100178 ieee80211_bss_info_change_notify(
179 sdata, BSS_CHANGED_BEACON_ENABLED);
Johannes Bergd6a83222012-12-14 14:06:28 +0100180 }
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100181 }
182 mutex_unlock(&local->iflist_mtx);
Seth Forshee6c17b772013-02-11 11:21:07 -0600183
Johannes Berg445ea4e2013-02-13 12:25:28 +0100184 ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
Seth Forshee6c17b772013-02-11 11:21:07 -0600185 IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL);
Jouni Malinenb203ffc2009-12-23 13:15:40 +0100186}
Johannes Berg21f83582010-12-18 17:20:47 +0100187
Johannes Berg2eb278e2012-06-05 14:28:42 +0200188void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc)
189{
190 if (roc->notified)
191 return;
192
193 if (roc->mgmt_tx_cookie) {
194 if (!WARN_ON(!roc->frame)) {
Johannes Berg55de9082012-07-26 17:24:39 +0200195 ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7,
196 roc->chan->band);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200197 roc->frame = NULL;
198 }
199 } else {
Johannes Berg50febf62012-10-26 16:13:06 +0200200 cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie,
Johannes Berg42d97a52012-11-08 18:31:02 +0100201 roc->chan, roc->req_duration,
202 GFP_KERNEL);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200203 }
204
205 roc->notified = true;
206}
207
Johannes Berg21f83582010-12-18 17:20:47 +0100208static void ieee80211_hw_roc_start(struct work_struct *work)
209{
210 struct ieee80211_local *local =
211 container_of(work, struct ieee80211_local, hw_roc_start);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200212 struct ieee80211_roc_work *roc, *dep, *tmp;
Johannes Berg21f83582010-12-18 17:20:47 +0100213
214 mutex_lock(&local->mtx);
215
Johannes Berg2eb278e2012-06-05 14:28:42 +0200216 if (list_empty(&local->roc_list))
217 goto out_unlock;
Johannes Berg21f83582010-12-18 17:20:47 +0100218
Johannes Berg2eb278e2012-06-05 14:28:42 +0200219 roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
220 list);
Johannes Berg90fc4b32010-12-18 17:20:48 +0100221
Johannes Berg2eb278e2012-06-05 14:28:42 +0200222 if (!roc->started)
223 goto out_unlock;
224
225 roc->hw_begun = true;
226 roc->hw_start_time = local->hw_roc_start_time;
227
228 ieee80211_handle_roc_started(roc);
229 list_for_each_entry_safe(dep, tmp, &roc->dependents, list) {
230 ieee80211_handle_roc_started(dep);
231
232 if (dep->duration > roc->duration) {
233 u32 dur = dep->duration;
234 dep->duration = dur - roc->duration;
235 roc->duration = dur;
Wei Yongjuna4ed5342012-09-06 13:20:53 +0800236 list_move(&dep->list, &roc->list);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200237 }
238 }
239 out_unlock:
Johannes Berg21f83582010-12-18 17:20:47 +0100240 mutex_unlock(&local->mtx);
241}
242
243void ieee80211_ready_on_channel(struct ieee80211_hw *hw)
244{
245 struct ieee80211_local *local = hw_to_local(hw);
246
Johannes Berg2eb278e2012-06-05 14:28:42 +0200247 local->hw_roc_start_time = jiffies;
248
Johannes Berg21f83582010-12-18 17:20:47 +0100249 trace_api_ready_on_channel(local);
250
251 ieee80211_queue_work(hw, &local->hw_roc_start);
252}
253EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel);
254
Johannes Berg2eb278e2012-06-05 14:28:42 +0200255void ieee80211_start_next_roc(struct ieee80211_local *local)
256{
257 struct ieee80211_roc_work *roc;
258
259 lockdep_assert_held(&local->mtx);
260
261 if (list_empty(&local->roc_list)) {
262 ieee80211_run_deferred_scan(local);
263 return;
264 }
265
266 roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
267 list);
268
Johannes Berg0f6b3f52012-06-20 20:11:33 +0200269 if (WARN_ON_ONCE(roc->started))
270 return;
271
Johannes Berg2eb278e2012-06-05 14:28:42 +0200272 if (local->ops->remain_on_channel) {
273 int ret, duration = roc->duration;
274
275 /* XXX: duplicated, see ieee80211_start_roc_work() */
276 if (!duration)
277 duration = 10;
278
Eliad Peller49884562012-11-19 17:05:09 +0200279 ret = drv_remain_on_channel(local, roc->sdata, roc->chan,
Ilan Peerd339d5c2013-02-12 09:34:13 +0200280 duration, roc->type);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200281
282 roc->started = true;
283
284 if (ret) {
285 wiphy_warn(local->hw.wiphy,
286 "failed to start next HW ROC (%d)\n", ret);
287 /*
288 * queue the work struct again to avoid recursion
289 * when multiple failures occur
290 */
291 ieee80211_remain_on_channel_expired(&local->hw);
292 }
293 } else {
294 /* delay it a bit */
295 ieee80211_queue_delayed_work(&local->hw, &roc->work,
296 round_jiffies_relative(HZ/2));
297 }
298}
299
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100300void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc, bool free)
Johannes Berg2eb278e2012-06-05 14:28:42 +0200301{
302 struct ieee80211_roc_work *dep, *tmp;
303
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100304 if (WARN_ON(roc->to_be_freed))
305 return;
306
Johannes Berg2eb278e2012-06-05 14:28:42 +0200307 /* was never transmitted */
308 if (roc->frame) {
Johannes Berg71bbc992012-06-15 15:30:18 +0200309 cfg80211_mgmt_tx_status(&roc->sdata->wdev,
Johannes Berg2eb278e2012-06-05 14:28:42 +0200310 (unsigned long)roc->frame,
311 roc->frame->data, roc->frame->len,
312 false, GFP_KERNEL);
313 kfree_skb(roc->frame);
314 }
315
316 if (!roc->mgmt_tx_cookie)
Johannes Berg71bbc992012-06-15 15:30:18 +0200317 cfg80211_remain_on_channel_expired(&roc->sdata->wdev,
Johannes Berg50febf62012-10-26 16:13:06 +0200318 roc->cookie, roc->chan,
Johannes Berg42d97a52012-11-08 18:31:02 +0100319 GFP_KERNEL);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200320
321 list_for_each_entry_safe(dep, tmp, &roc->dependents, list)
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100322 ieee80211_roc_notify_destroy(dep, true);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200323
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100324 if (free)
325 kfree(roc);
326 else
327 roc->to_be_freed = true;
Johannes Berg2eb278e2012-06-05 14:28:42 +0200328}
329
330void ieee80211_sw_roc_work(struct work_struct *work)
331{
332 struct ieee80211_roc_work *roc =
333 container_of(work, struct ieee80211_roc_work, work.work);
334 struct ieee80211_sub_if_data *sdata = roc->sdata;
335 struct ieee80211_local *local = sdata->local;
Alan Cox4b4b8222012-07-13 16:14:45 +0200336 bool started;
Johannes Berg2eb278e2012-06-05 14:28:42 +0200337
338 mutex_lock(&local->mtx);
339
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100340 if (roc->to_be_freed)
341 goto out_unlock;
342
Johannes Berg2eb278e2012-06-05 14:28:42 +0200343 if (roc->abort)
344 goto finish;
345
346 if (WARN_ON(list_empty(&local->roc_list)))
347 goto out_unlock;
348
349 if (WARN_ON(roc != list_first_entry(&local->roc_list,
350 struct ieee80211_roc_work,
351 list)))
352 goto out_unlock;
353
354 if (!roc->started) {
355 struct ieee80211_roc_work *dep;
356
357 /* start this ROC */
358
359 /* switch channel etc */
360 ieee80211_recalc_idle(local);
361
362 local->tmp_channel = roc->chan;
Johannes Berg2eb278e2012-06-05 14:28:42 +0200363 ieee80211_hw_config(local, 0);
364
365 /* tell userspace or send frame */
366 ieee80211_handle_roc_started(roc);
367 list_for_each_entry(dep, &roc->dependents, list)
368 ieee80211_handle_roc_started(dep);
369
370 /* if it was pure TX, just finish right away */
371 if (!roc->duration)
372 goto finish;
373
374 roc->started = true;
375 ieee80211_queue_delayed_work(&local->hw, &roc->work,
376 msecs_to_jiffies(roc->duration));
377 } else {
378 /* finish this ROC */
379 finish:
380 list_del(&roc->list);
Alan Cox4b4b8222012-07-13 16:14:45 +0200381 started = roc->started;
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100382 ieee80211_roc_notify_destroy(roc, !roc->abort);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200383
Alan Cox4b4b8222012-07-13 16:14:45 +0200384 if (started) {
Johannes Berg39ecc012013-02-13 12:11:00 +0100385 ieee80211_flush_queues(local, NULL);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200386
387 local->tmp_channel = NULL;
388 ieee80211_hw_config(local, 0);
389
Stanislaw Gruszkaaacde9e2012-12-20 14:41:18 +0100390 ieee80211_offchannel_return(local);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200391 }
392
393 ieee80211_recalc_idle(local);
394
Alan Cox4b4b8222012-07-13 16:14:45 +0200395 if (started)
Johannes Berg0f6b3f52012-06-20 20:11:33 +0200396 ieee80211_start_next_roc(local);
Jouni Malinen22c4cee2013-09-30 12:36:05 +0300397 else if (list_empty(&local->roc_list))
398 ieee80211_run_deferred_scan(local);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200399 }
400
401 out_unlock:
402 mutex_unlock(&local->mtx);
403}
404
Johannes Berg21f83582010-12-18 17:20:47 +0100405static void ieee80211_hw_roc_done(struct work_struct *work)
406{
407 struct ieee80211_local *local =
408 container_of(work, struct ieee80211_local, hw_roc_done);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200409 struct ieee80211_roc_work *roc;
Johannes Berg21f83582010-12-18 17:20:47 +0100410
411 mutex_lock(&local->mtx);
412
Johannes Berg2eb278e2012-06-05 14:28:42 +0200413 if (list_empty(&local->roc_list))
414 goto out_unlock;
Johannes Berg21f83582010-12-18 17:20:47 +0100415
Johannes Berg2eb278e2012-06-05 14:28:42 +0200416 roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work,
417 list);
Johannes Berg71ecfa12012-05-31 15:09:27 +0200418
Johannes Berg2eb278e2012-06-05 14:28:42 +0200419 if (!roc->started)
420 goto out_unlock;
Johannes Berg71ecfa12012-05-31 15:09:27 +0200421
Johannes Berg2eb278e2012-06-05 14:28:42 +0200422 list_del(&roc->list);
Johannes Berg71ecfa12012-05-31 15:09:27 +0200423
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100424 ieee80211_roc_notify_destroy(roc, true);
Johannes Berg71ecfa12012-05-31 15:09:27 +0200425
Johannes Berg2eb278e2012-06-05 14:28:42 +0200426 /* if there's another roc, start it now */
427 ieee80211_start_next_roc(local);
Johannes Berg21f83582010-12-18 17:20:47 +0100428
Johannes Berg2eb278e2012-06-05 14:28:42 +0200429 out_unlock:
Johannes Berg21f83582010-12-18 17:20:47 +0100430 mutex_unlock(&local->mtx);
431}
432
433void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw)
434{
435 struct ieee80211_local *local = hw_to_local(hw);
436
437 trace_api_remain_on_channel_expired(local);
438
439 ieee80211_queue_work(hw, &local->hw_roc_done);
440}
441EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired);
442
Johannes Berg2eb278e2012-06-05 14:28:42 +0200443void ieee80211_roc_setup(struct ieee80211_local *local)
Johannes Berg21f83582010-12-18 17:20:47 +0100444{
445 INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start);
446 INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200447 INIT_LIST_HEAD(&local->roc_list);
448}
449
Johannes Bergc8f994e2013-03-27 22:49:19 +0100450void ieee80211_roc_purge(struct ieee80211_local *local,
451 struct ieee80211_sub_if_data *sdata)
Johannes Berg2eb278e2012-06-05 14:28:42 +0200452{
Johannes Berg2eb278e2012-06-05 14:28:42 +0200453 struct ieee80211_roc_work *roc, *tmp;
454 LIST_HEAD(tmp_list);
455
456 mutex_lock(&local->mtx);
457 list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
Johannes Bergc8f994e2013-03-27 22:49:19 +0100458 if (sdata && roc->sdata != sdata)
Johannes Berg2eb278e2012-06-05 14:28:42 +0200459 continue;
460
461 if (roc->started && local->ops->remain_on_channel) {
462 /* can race, so ignore return value */
463 drv_cancel_remain_on_channel(local);
464 }
465
466 list_move_tail(&roc->list, &tmp_list);
467 roc->abort = true;
468 }
Johannes Berg2eb278e2012-06-05 14:28:42 +0200469 mutex_unlock(&local->mtx);
470
471 list_for_each_entry_safe(roc, tmp, &tmp_list, list) {
472 if (local->ops->remain_on_channel) {
473 list_del(&roc->list);
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100474 ieee80211_roc_notify_destroy(roc, true);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200475 } else {
476 ieee80211_queue_delayed_work(&local->hw, &roc->work, 0);
477
478 /* work will clean up etc */
479 flush_delayed_work(&roc->work);
Johannes Berg3fbd45c2013-03-25 11:51:14 +0100480 WARN_ON(!roc->to_be_freed);
481 kfree(roc);
Johannes Berg2eb278e2012-06-05 14:28:42 +0200482 }
483 }
484
485 WARN_ON_ONCE(!list_empty(&tmp_list));
Johannes Berg21f83582010-12-18 17:20:47 +0100486}