2 * Scanning implementation
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>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/if_arp.h>
16 #include <linux/rtnetlink.h>
17 #include <linux/pm_qos_params.h>
18 #include <net/sch_generic.h>
19 #include <linux/slab.h>
20 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #define IEEE80211_PROBE_DELAY (HZ / 33)
27 #define IEEE80211_CHANNEL_TIME (HZ / 33)
28 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 8)
30 struct ieee80211_bss *
31 ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
32 u8 *ssid, u8 ssid_len)
34 struct cfg80211_bss *cbss;
36 cbss = cfg80211_get_bss(local->hw.wiphy,
37 ieee80211_get_channel(local->hw.wiphy, freq),
38 bssid, ssid, ssid_len, 0, 0);
41 return (void *)cbss->priv;
44 static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
46 struct ieee80211_bss *bss = (void *)cbss->priv;
48 kfree(bss_mesh_id(bss));
49 kfree(bss_mesh_cfg(bss));
52 void ieee80211_rx_bss_put(struct ieee80211_local *local,
53 struct ieee80211_bss *bss)
57 cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv));
60 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
64 if (elems->wmm_info && elems->wmm_info_len == 7
65 && elems->wmm_info[5] == 1)
66 qos_info = elems->wmm_info[6];
67 else if (elems->wmm_param && elems->wmm_param_len == 24
68 && elems->wmm_param[5] == 1)
69 qos_info = elems->wmm_param[6];
71 /* no valid wmm information or parameter element found */
74 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
77 struct ieee80211_bss *
78 ieee80211_bss_info_update(struct ieee80211_local *local,
79 struct ieee80211_rx_status *rx_status,
80 struct ieee80211_mgmt *mgmt,
82 struct ieee802_11_elems *elems,
83 struct ieee80211_channel *channel,
86 struct cfg80211_bss *cbss;
87 struct ieee80211_bss *bss;
91 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
92 signal = rx_status->signal * 100;
93 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
94 signal = (rx_status->signal * 100) / local->hw.max_signal;
96 cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel,
97 mgmt, len, signal, GFP_ATOMIC);
102 cbss->free_priv = ieee80211_rx_bss_free;
103 bss = (void *)cbss->priv;
105 /* save the ERP value so that it is available at association time */
106 if (elems->erp_info && elems->erp_info_len >= 1) {
107 bss->erp_value = elems->erp_info[0];
108 bss->has_erp_value = 1;
112 struct ieee80211_tim_ie *tim_ie =
113 (struct ieee80211_tim_ie *)elems->tim;
114 bss->dtim_period = tim_ie->dtim_period;
117 /* If the beacon had no TIM IE, or it was invalid, use 1 */
118 if (beacon && !bss->dtim_period)
119 bss->dtim_period = 1;
121 /* replace old supported rates if we get new values */
123 if (elems->supp_rates) {
124 clen = IEEE80211_MAX_SUPP_RATES;
125 if (clen > elems->supp_rates_len)
126 clen = elems->supp_rates_len;
127 memcpy(bss->supp_rates, elems->supp_rates, clen);
130 if (elems->ext_supp_rates) {
131 clen = IEEE80211_MAX_SUPP_RATES - srlen;
132 if (clen > elems->ext_supp_rates_len)
133 clen = elems->ext_supp_rates_len;
134 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, clen);
138 bss->supp_rates_len = srlen;
140 bss->wmm_used = elems->wmm_param || elems->wmm_info;
141 bss->uapsd_supported = is_uapsd_supported(elems);
144 bss->last_probe_resp = jiffies;
150 ieee80211_scan_rx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
152 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
153 struct ieee80211_mgmt *mgmt;
154 struct ieee80211_bss *bss;
156 struct ieee80211_channel *channel;
160 bool presp, beacon = false;
161 struct ieee802_11_elems elems;
164 return RX_DROP_UNUSABLE;
166 mgmt = (struct ieee80211_mgmt *) skb->data;
167 fc = mgmt->frame_control;
169 if (ieee80211_is_ctl(fc))
173 return RX_DROP_MONITOR;
175 presp = ieee80211_is_probe_resp(fc);
177 /* ignore ProbeResp to foreign address */
178 if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
179 return RX_DROP_MONITOR;
182 elements = mgmt->u.probe_resp.variable;
183 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
185 beacon = ieee80211_is_beacon(fc);
186 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
187 elements = mgmt->u.beacon.variable;
190 if (!presp && !beacon)
193 if (baselen > skb->len)
194 return RX_DROP_MONITOR;
196 ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
198 if (elems.ds_params && elems.ds_params_len == 1)
199 freq = ieee80211_channel_to_frequency(elems.ds_params[0],
202 freq = rx_status->freq;
204 channel = ieee80211_get_channel(sdata->local->hw.wiphy, freq);
206 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
207 return RX_DROP_MONITOR;
209 bss = ieee80211_bss_info_update(sdata->local, rx_status,
210 mgmt, skb->len, &elems,
213 ieee80211_rx_bss_put(sdata->local, bss);
215 /* If we are on-operating-channel, and this packet is for the
216 * current channel, pass the pkt on up the stack so that
217 * the rest of the stack can make use of it.
219 if (ieee80211_cfg_on_oper_channel(sdata->local)
220 && (channel == sdata->local->oper_channel))
227 /* return false if no more work */
228 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
230 struct cfg80211_scan_request *req = local->scan_req;
231 enum ieee80211_band band;
232 int i, ielen, n_chans;
235 if (local->hw_scan_band == IEEE80211_NUM_BANDS)
238 band = local->hw_scan_band;
240 for (i = 0; i < req->n_channels; i++) {
241 if (req->channels[i]->band == band) {
242 local->hw_scan_req->channels[n_chans] =
248 local->hw_scan_band++;
251 local->hw_scan_req->n_channels = n_chans;
253 ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie,
254 req->ie, req->ie_len, band, (u32) -1,
256 local->hw_scan_req->ie_len = ielen;
261 static bool __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
264 struct ieee80211_local *local = hw_to_local(hw);
266 lockdep_assert_held(&local->mtx);
269 * It's ok to abort a not-yet-running scan (that
270 * we have one at all will be verified by checking
271 * local->scan_req next), but not to complete it
274 if (WARN_ON(!local->scanning && !aborted))
277 if (WARN_ON(!local->scan_req))
280 if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
281 int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req);
286 kfree(local->hw_scan_req);
287 local->hw_scan_req = NULL;
289 if (local->scan_req != local->int_scan_req)
290 cfg80211_scan_done(local->scan_req, aborted);
291 local->scan_req = NULL;
292 local->scan_sdata = NULL;
295 local->scan_channel = NULL;
300 static void __ieee80211_scan_completed_finish(struct ieee80211_hw *hw,
303 struct ieee80211_local *local = hw_to_local(hw);
305 bool enable_beacons = false;
307 mutex_lock(&local->mtx);
308 on_oper_chan = ieee80211_cfg_on_oper_channel(local);
310 if (was_hw_scan || !on_oper_chan) {
311 if (WARN_ON(local->scan_channel))
312 local->scan_channel = NULL;
313 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
318 ieee80211_configure_filter(local);
319 drv_sw_scan_complete(local);
320 on_oper_chan2 = ieee80211_cfg_on_oper_channel(local);
321 /* We should always be on-channel at this point. */
322 WARN_ON(!on_oper_chan2);
323 if (on_oper_chan2 && (on_oper_chan != on_oper_chan2))
324 enable_beacons = true;
326 ieee80211_offchannel_return(local, enable_beacons, true);
329 ieee80211_recalc_idle(local);
330 mutex_unlock(&local->mtx);
332 ieee80211_mlme_notify_scan_completed(local);
333 ieee80211_ibss_notify_scan_completed(local);
334 ieee80211_mesh_notify_scan_completed(local);
335 ieee80211_queue_work(&local->hw, &local->work_work);
338 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
340 struct ieee80211_local *local = hw_to_local(hw);
342 trace_api_scan_completed(local, aborted);
344 set_bit(SCAN_COMPLETED, &local->scanning);
346 set_bit(SCAN_ABORTED, &local->scanning);
347 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
349 EXPORT_SYMBOL(ieee80211_scan_completed);
351 static int ieee80211_start_sw_scan(struct ieee80211_local *local)
354 * Hardware/driver doesn't support hw_scan, so use software
355 * scanning instead. First send a nullfunc frame with power save
356 * bit on so that AP will buffer the frames for us while we are not
357 * listening, then send probe requests to each channel and wait for
358 * the responses. After all channels are scanned, tune back to the
359 * original channel and send a nullfunc frame with power save bit
360 * off to trigger the AP to send us all the buffered frames.
362 * Note that while local->sw_scanning is true everything else but
363 * nullfunc frames and probe requests will be dropped in
364 * ieee80211_tx_h_check_assoc().
366 drv_sw_scan_start(local);
368 local->leave_oper_channel_time = 0;
369 local->next_scan_state = SCAN_DECISION;
370 local->scan_channel_idx = 0;
372 /* We always want to use off-channel PS, even if we
373 * are not really leaving oper-channel. Don't
374 * tell the AP though, as long as we are on-channel.
376 ieee80211_offchannel_enable_all_ps(local, false);
378 ieee80211_configure_filter(local);
380 ieee80211_queue_delayed_work(&local->hw,
382 IEEE80211_CHANNEL_TIME);
388 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
389 struct cfg80211_scan_request *req)
391 struct ieee80211_local *local = sdata->local;
394 lockdep_assert_held(&local->mtx);
399 if (!list_empty(&local->work_list)) {
400 /* wait for the work to finish/time out */
401 local->scan_req = req;
402 local->scan_sdata = sdata;
406 if (local->ops->hw_scan) {
409 local->hw_scan_req = kmalloc(
410 sizeof(*local->hw_scan_req) +
411 req->n_channels * sizeof(req->channels[0]) +
412 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len +
413 req->ie_len, GFP_KERNEL);
414 if (!local->hw_scan_req)
417 local->hw_scan_req->ssids = req->ssids;
418 local->hw_scan_req->n_ssids = req->n_ssids;
419 ies = (u8 *)local->hw_scan_req +
420 sizeof(*local->hw_scan_req) +
421 req->n_channels * sizeof(req->channels[0]);
422 local->hw_scan_req->ie = ies;
424 local->hw_scan_band = 0;
427 * After allocating local->hw_scan_req, we must
428 * go through until ieee80211_prep_hw_scan(), so
429 * anything that might be changed here and leave
430 * this function early must not go after this
435 local->scan_req = req;
436 local->scan_sdata = sdata;
438 if (local->ops->hw_scan)
439 __set_bit(SCAN_HW_SCANNING, &local->scanning);
441 __set_bit(SCAN_SW_SCANNING, &local->scanning);
443 ieee80211_recalc_idle(local);
445 if (local->ops->hw_scan) {
446 WARN_ON(!ieee80211_prep_hw_scan(local));
447 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
449 rc = ieee80211_start_sw_scan(local);
452 kfree(local->hw_scan_req);
453 local->hw_scan_req = NULL;
456 ieee80211_recalc_idle(local);
458 local->scan_req = NULL;
459 local->scan_sdata = NULL;
466 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
469 * TODO: channel switching also consumes quite some time,
470 * add that delay as well to get a better estimation
472 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
473 return IEEE80211_PASSIVE_CHANNEL_TIME;
474 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
477 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
478 unsigned long *next_delay)
480 bool associated = false;
481 bool tx_empty = true;
483 bool listen_int_exceeded;
484 unsigned long min_beacon_int = 0;
485 struct ieee80211_sub_if_data *sdata;
486 struct ieee80211_channel *next_chan;
489 * check if at least one STA interface is associated,
490 * check if at least one STA interface has pending tx frames
491 * and grab the lowest used beacon interval
493 mutex_lock(&local->iflist_mtx);
494 list_for_each_entry(sdata, &local->interfaces, list) {
495 if (!ieee80211_sdata_running(sdata))
498 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
499 if (sdata->u.mgd.associated) {
502 if (sdata->vif.bss_conf.beacon_int <
503 min_beacon_int || min_beacon_int == 0)
505 sdata->vif.bss_conf.beacon_int;
507 if (!qdisc_all_tx_empty(sdata->dev)) {
514 mutex_unlock(&local->iflist_mtx);
516 next_chan = local->scan_req->channels[local->scan_channel_idx];
518 if (ieee80211_cfg_on_oper_channel(local)) {
519 /* We're currently on operating channel. */
520 if (next_chan == local->oper_channel)
521 /* We don't need to move off of operating channel. */
522 local->next_scan_state = SCAN_SET_CHANNEL;
525 * We do need to leave operating channel, as next
526 * scan is somewhere else.
528 local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL;
531 * we're currently scanning a different channel, let's
532 * see if we can scan another channel without interfering
533 * with the current traffic situation.
535 * Since we don't know if the AP has pending frames for us
536 * we can only check for our tx queues and use the current
537 * pm_qos requirements for rx. Hence, if no tx traffic occurs
538 * at all we will scan as many channels in a row as the pm_qos
539 * latency allows us to. Additionally we also check for the
540 * currently negotiated listen interval to prevent losing
541 * frames unnecessarily.
543 * Otherwise switch back to the operating channel.
546 bad_latency = time_after(jiffies +
547 ieee80211_scan_get_channel_time(next_chan),
548 local->leave_oper_channel_time +
549 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY)));
551 listen_int_exceeded = time_after(jiffies +
552 ieee80211_scan_get_channel_time(next_chan),
553 local->leave_oper_channel_time +
554 usecs_to_jiffies(min_beacon_int * 1024) *
555 local->hw.conf.listen_interval);
557 if (associated && ( !tx_empty || bad_latency ||
558 listen_int_exceeded))
559 local->next_scan_state = SCAN_ENTER_OPER_CHANNEL;
561 local->next_scan_state = SCAN_SET_CHANNEL;
567 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local,
568 unsigned long *next_delay)
570 /* PS will already be in off-channel mode,
571 * we do that once at the beginning of scanning.
573 ieee80211_offchannel_stop_vifs(local, false);
576 * What if the nullfunc frames didn't arrive?
578 drv_flush(local, false);
579 if (local->ops->flush)
582 *next_delay = HZ / 10;
584 /* remember when we left the operating channel */
585 local->leave_oper_channel_time = jiffies;
587 /* advance to the next channel to be scanned */
588 local->next_scan_state = SCAN_SET_CHANNEL;
591 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local,
592 unsigned long *next_delay)
594 /* switch back to the operating channel */
595 local->scan_channel = NULL;
596 if (!ieee80211_cfg_on_oper_channel(local))
597 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
600 * Re-enable vifs and beaconing. Leave PS
601 * in off-channel state..will put that back
602 * on-channel at the end of scanning.
604 ieee80211_offchannel_return(local, true, false);
606 *next_delay = HZ / 5;
607 local->next_scan_state = SCAN_DECISION;
610 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
611 unsigned long *next_delay)
614 struct ieee80211_channel *chan;
617 chan = local->scan_req->channels[local->scan_channel_idx];
619 local->scan_channel = chan;
621 /* Only call hw-config if we really need to change channels. */
622 if (chan != local->hw.conf.channel)
623 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
626 /* advance state machine to next channel/band */
627 local->scan_channel_idx++;
630 /* if we skip this channel return to the decision state */
631 local->next_scan_state = SCAN_DECISION;
636 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
637 * (which unfortunately doesn't say _why_ step a) is done,
638 * but it waits for the probe delay or until a frame is
639 * received - and the received frame would update the NAV).
640 * For now, we do not support waiting until a frame is
643 * In any case, it is not necessary for a passive scan.
645 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
646 !local->scan_req->n_ssids) {
647 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
648 local->next_scan_state = SCAN_DECISION;
652 /* active scan, send probes */
653 *next_delay = IEEE80211_PROBE_DELAY;
654 local->next_scan_state = SCAN_SEND_PROBE;
657 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
658 unsigned long *next_delay)
661 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
663 for (i = 0; i < local->scan_req->n_ssids; i++)
664 ieee80211_send_probe_req(
666 local->scan_req->ssids[i].ssid,
667 local->scan_req->ssids[i].ssid_len,
668 local->scan_req->ie, local->scan_req->ie_len);
671 * After sending probe requests, wait for probe responses
674 *next_delay = IEEE80211_CHANNEL_TIME;
675 local->next_scan_state = SCAN_DECISION;
678 void ieee80211_scan_work(struct work_struct *work)
680 struct ieee80211_local *local =
681 container_of(work, struct ieee80211_local, scan_work.work);
682 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
683 unsigned long next_delay = 0;
684 bool aborted, hw_scan, finish;
686 mutex_lock(&local->mtx);
688 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
689 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
693 if (!sdata || !local->scan_req)
696 if (local->scan_req && !local->scanning) {
697 struct cfg80211_scan_request *req = local->scan_req;
700 local->scan_req = NULL;
701 local->scan_sdata = NULL;
703 rc = __ieee80211_start_scan(sdata, req);
705 /* need to complete scan in cfg80211 */
706 local->scan_req = req;
714 * Avoid re-scheduling when the sdata is going away.
716 if (!ieee80211_sdata_running(sdata)) {
722 * as long as no delay is required advance immediately
723 * without scheduling a new work
726 switch (local->next_scan_state) {
728 /* if no more bands/channels left, complete scan */
729 if (local->scan_channel_idx >= local->scan_req->n_channels) {
733 ieee80211_scan_state_decision(local, &next_delay);
735 case SCAN_SET_CHANNEL:
736 ieee80211_scan_state_set_channel(local, &next_delay);
738 case SCAN_SEND_PROBE:
739 ieee80211_scan_state_send_probe(local, &next_delay);
741 case SCAN_LEAVE_OPER_CHANNEL:
742 ieee80211_scan_state_leave_oper_channel(local, &next_delay);
744 case SCAN_ENTER_OPER_CHANNEL:
745 ieee80211_scan_state_enter_oper_channel(local, &next_delay);
748 } while (next_delay == 0);
750 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
751 mutex_unlock(&local->mtx);
755 hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
756 finish = __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
757 mutex_unlock(&local->mtx);
759 __ieee80211_scan_completed_finish(&local->hw, hw_scan);
763 mutex_unlock(&local->mtx);
766 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
767 struct cfg80211_scan_request *req)
771 mutex_lock(&sdata->local->mtx);
772 res = __ieee80211_start_scan(sdata, req);
773 mutex_unlock(&sdata->local->mtx);
778 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
779 const u8 *ssid, u8 ssid_len,
780 struct ieee80211_channel *chan)
782 struct ieee80211_local *local = sdata->local;
784 enum ieee80211_band band;
786 mutex_lock(&local->mtx);
792 /* fill internal scan request */
796 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
797 if (!local->hw.wiphy->bands[band])
800 i < local->hw.wiphy->bands[band]->n_channels;
802 local->int_scan_req->channels[nchan] =
803 &local->hw.wiphy->bands[band]->channels[i];
808 local->int_scan_req->n_channels = nchan;
810 local->int_scan_req->channels[0] = chan;
811 local->int_scan_req->n_channels = 1;
814 local->int_scan_req->ssids = &local->scan_ssid;
815 local->int_scan_req->n_ssids = 1;
816 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
817 local->int_scan_req->ssids[0].ssid_len = ssid_len;
819 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
821 mutex_unlock(&local->mtx);
826 * Only call this function when a scan can't be queued -- under RTNL.
828 void ieee80211_scan_cancel(struct ieee80211_local *local)
834 * We are only canceling software scan, or deferred scan that was not
835 * yet really started (see __ieee80211_start_scan ).
837 * Regarding hardware scan:
838 * - we can not call __ieee80211_scan_completed() as when
839 * SCAN_HW_SCANNING bit is set this function change
840 * local->hw_scan_req to operate on 5G band, what race with
841 * driver which can use local->hw_scan_req
843 * - we can not cancel scan_work since driver can schedule it
844 * by ieee80211_scan_completed(..., true) to finish scan
846 * Hence low lever driver is responsible for canceling HW scan.
849 mutex_lock(&local->mtx);
850 abortscan = local->scan_req && !test_bit(SCAN_HW_SCANNING, &local->scanning);
852 finish = __ieee80211_scan_completed(&local->hw, true, false);
853 mutex_unlock(&local->mtx);
856 /* The scan is canceled, but stop work from being pending */
857 cancel_delayed_work_sync(&local->scan_work);
860 __ieee80211_scan_completed_finish(&local->hw, false);