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.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))
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 (channel == sdata->local->oper_channel)
222 /* return false if no more work */
223 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
225 struct cfg80211_scan_request *req = local->scan_req;
226 enum ieee80211_band band;
227 int i, ielen, n_chans;
230 if (local->hw_scan_band == IEEE80211_NUM_BANDS)
233 band = local->hw_scan_band;
235 for (i = 0; i < req->n_channels; i++) {
236 if (req->channels[i]->band == band) {
237 local->hw_scan_req->channels[n_chans] =
243 local->hw_scan_band++;
246 local->hw_scan_req->n_channels = n_chans;
248 ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie,
249 req->ie, req->ie_len, band,
250 req->rates[band], 0);
251 local->hw_scan_req->ie_len = ielen;
252 local->hw_scan_req->no_cck = req->no_cck;
257 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
260 struct ieee80211_local *local = hw_to_local(hw);
262 lockdep_assert_held(&local->mtx);
265 * It's ok to abort a not-yet-running scan (that
266 * we have one at all will be verified by checking
267 * local->scan_req next), but not to complete it
270 if (WARN_ON(!local->scanning && !aborted))
273 if (WARN_ON(!local->scan_req))
276 if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
277 int rc = drv_hw_scan(local, local->scan_sdata, local->hw_scan_req);
282 kfree(local->hw_scan_req);
283 local->hw_scan_req = NULL;
285 if (local->scan_req != local->int_scan_req)
286 cfg80211_scan_done(local->scan_req, aborted);
287 local->scan_req = NULL;
288 local->scan_sdata = NULL;
291 local->scan_channel = NULL;
293 /* Set power back to normal operating levels. */
294 ieee80211_hw_config(local, 0);
297 ieee80211_configure_filter(local);
298 drv_sw_scan_complete(local);
299 ieee80211_offchannel_return(local, true, true);
302 ieee80211_recalc_idle(local);
304 ieee80211_mlme_notify_scan_completed(local);
305 ieee80211_ibss_notify_scan_completed(local);
306 ieee80211_mesh_notify_scan_completed(local);
307 ieee80211_queue_work(&local->hw, &local->work_work);
310 void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
312 struct ieee80211_local *local = hw_to_local(hw);
314 trace_api_scan_completed(local, aborted);
316 set_bit(SCAN_COMPLETED, &local->scanning);
318 set_bit(SCAN_ABORTED, &local->scanning);
319 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
321 EXPORT_SYMBOL(ieee80211_scan_completed);
323 static int ieee80211_start_sw_scan(struct ieee80211_local *local)
326 * Hardware/driver doesn't support hw_scan, so use software
327 * scanning instead. First send a nullfunc frame with power save
328 * bit on so that AP will buffer the frames for us while we are not
329 * listening, then send probe requests to each channel and wait for
330 * the responses. After all channels are scanned, tune back to the
331 * original channel and send a nullfunc frame with power save bit
332 * off to trigger the AP to send us all the buffered frames.
334 * Note that while local->sw_scanning is true everything else but
335 * nullfunc frames and probe requests will be dropped in
336 * ieee80211_tx_h_check_assoc().
338 drv_sw_scan_start(local);
340 local->leave_oper_channel_time = 0;
341 local->next_scan_state = SCAN_DECISION;
342 local->scan_channel_idx = 0;
344 ieee80211_offchannel_stop_vifs(local, true);
346 ieee80211_configure_filter(local);
348 /* We need to set power level at maximum rate for scanning. */
349 ieee80211_hw_config(local, 0);
351 ieee80211_queue_delayed_work(&local->hw,
352 &local->scan_work, 0);
358 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
359 struct cfg80211_scan_request *req)
361 struct ieee80211_local *local = sdata->local;
364 lockdep_assert_held(&local->mtx);
369 if (!list_empty(&local->work_list)) {
370 /* wait for the work to finish/time out */
371 local->scan_req = req;
372 local->scan_sdata = sdata;
376 if (local->ops->hw_scan) {
379 local->hw_scan_req = kmalloc(
380 sizeof(*local->hw_scan_req) +
381 req->n_channels * sizeof(req->channels[0]) +
382 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len +
383 req->ie_len, GFP_KERNEL);
384 if (!local->hw_scan_req)
387 local->hw_scan_req->ssids = req->ssids;
388 local->hw_scan_req->n_ssids = req->n_ssids;
389 ies = (u8 *)local->hw_scan_req +
390 sizeof(*local->hw_scan_req) +
391 req->n_channels * sizeof(req->channels[0]);
392 local->hw_scan_req->ie = ies;
394 local->hw_scan_band = 0;
397 * After allocating local->hw_scan_req, we must
398 * go through until ieee80211_prep_hw_scan(), so
399 * anything that might be changed here and leave
400 * this function early must not go after this
405 local->scan_req = req;
406 local->scan_sdata = sdata;
408 if (local->ops->hw_scan)
409 __set_bit(SCAN_HW_SCANNING, &local->scanning);
411 __set_bit(SCAN_SW_SCANNING, &local->scanning);
413 ieee80211_recalc_idle(local);
415 if (local->ops->hw_scan) {
416 WARN_ON(!ieee80211_prep_hw_scan(local));
417 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
419 rc = ieee80211_start_sw_scan(local);
422 kfree(local->hw_scan_req);
423 local->hw_scan_req = NULL;
426 ieee80211_recalc_idle(local);
428 local->scan_req = NULL;
429 local->scan_sdata = NULL;
436 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
439 * TODO: channel switching also consumes quite some time,
440 * add that delay as well to get a better estimation
442 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
443 return IEEE80211_PASSIVE_CHANNEL_TIME;
444 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
447 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
448 unsigned long *next_delay)
450 bool associated = false;
451 bool tx_empty = true;
453 bool listen_int_exceeded;
454 unsigned long min_beacon_int = 0;
455 struct ieee80211_sub_if_data *sdata;
456 struct ieee80211_channel *next_chan;
459 * check if at least one STA interface is associated,
460 * check if at least one STA interface has pending tx frames
461 * and grab the lowest used beacon interval
463 mutex_lock(&local->iflist_mtx);
464 list_for_each_entry(sdata, &local->interfaces, list) {
465 if (!ieee80211_sdata_running(sdata))
468 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
469 if (sdata->u.mgd.associated) {
472 if (sdata->vif.bss_conf.beacon_int <
473 min_beacon_int || min_beacon_int == 0)
475 sdata->vif.bss_conf.beacon_int;
477 if (!qdisc_all_tx_empty(sdata->dev)) {
484 mutex_unlock(&local->iflist_mtx);
486 next_chan = local->scan_req->channels[local->scan_channel_idx];
489 * we're currently scanning a different channel, let's
490 * see if we can scan another channel without interfering
491 * with the current traffic situation.
493 * Since we don't know if the AP has pending frames for us
494 * we can only check for our tx queues and use the current
495 * pm_qos requirements for rx. Hence, if no tx traffic occurs
496 * at all we will scan as many channels in a row as the pm_qos
497 * latency allows us to. Additionally we also check for the
498 * currently negotiated listen interval to prevent losing
499 * frames unnecessarily.
501 * Otherwise switch back to the operating channel.
504 bad_latency = time_after(jiffies +
505 ieee80211_scan_get_channel_time(next_chan),
506 local->leave_oper_channel_time +
507 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY)));
509 listen_int_exceeded = time_after(jiffies +
510 ieee80211_scan_get_channel_time(next_chan),
511 local->leave_oper_channel_time +
512 usecs_to_jiffies(min_beacon_int * 1024) *
513 local->hw.conf.listen_interval);
515 if (associated && (!tx_empty || bad_latency || listen_int_exceeded))
516 local->next_scan_state = SCAN_SUSPEND;
518 local->next_scan_state = SCAN_SET_CHANNEL;
523 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
524 unsigned long *next_delay)
527 struct ieee80211_channel *chan;
530 chan = local->scan_req->channels[local->scan_channel_idx];
532 local->scan_channel = chan;
534 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
537 /* advance state machine to next channel/band */
538 local->scan_channel_idx++;
541 /* if we skip this channel return to the decision state */
542 local->next_scan_state = SCAN_DECISION;
547 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
548 * (which unfortunately doesn't say _why_ step a) is done,
549 * but it waits for the probe delay or until a frame is
550 * received - and the received frame would update the NAV).
551 * For now, we do not support waiting until a frame is
554 * In any case, it is not necessary for a passive scan.
556 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
557 !local->scan_req->n_ssids) {
558 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
559 local->next_scan_state = SCAN_DECISION;
563 /* active scan, send probes */
564 *next_delay = IEEE80211_PROBE_DELAY;
565 local->next_scan_state = SCAN_SEND_PROBE;
568 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
569 unsigned long *next_delay)
572 struct ieee80211_sub_if_data *sdata = local->scan_sdata;
573 enum ieee80211_band band = local->hw.conf.channel->band;
575 for (i = 0; i < local->scan_req->n_ssids; i++)
576 ieee80211_send_probe_req(
578 local->scan_req->ssids[i].ssid,
579 local->scan_req->ssids[i].ssid_len,
580 local->scan_req->ie, local->scan_req->ie_len,
581 local->scan_req->rates[band], false,
582 local->scan_req->no_cck);
585 * After sending probe requests, wait for probe responses
588 *next_delay = IEEE80211_CHANNEL_TIME;
589 local->next_scan_state = SCAN_DECISION;
592 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
593 unsigned long *next_delay)
595 /* switch back to the operating channel */
596 local->scan_channel = NULL;
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 /* afterwards, resume scan & go to next channel */
608 local->next_scan_state = SCAN_RESUME;
611 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
612 unsigned long *next_delay)
614 /* PS already is in off-channel mode */
615 ieee80211_offchannel_stop_vifs(local, false);
617 if (local->ops->flush) {
618 drv_flush(local, false);
621 *next_delay = HZ / 10;
623 /* remember when we left the operating channel */
624 local->leave_oper_channel_time = jiffies;
626 /* advance to the next channel to be scanned */
627 local->next_scan_state = SCAN_DECISION;
630 void ieee80211_scan_work(struct work_struct *work)
632 struct ieee80211_local *local =
633 container_of(work, struct ieee80211_local, scan_work.work);
634 struct ieee80211_sub_if_data *sdata;
635 unsigned long next_delay = 0;
636 bool aborted, hw_scan;
638 mutex_lock(&local->mtx);
640 sdata = local->scan_sdata;
642 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
643 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
647 if (!sdata || !local->scan_req)
650 if (local->scan_req && !local->scanning) {
651 struct cfg80211_scan_request *req = local->scan_req;
654 local->scan_req = NULL;
655 local->scan_sdata = NULL;
657 rc = __ieee80211_start_scan(sdata, req);
659 /* need to complete scan in cfg80211 */
660 local->scan_req = req;
668 * Avoid re-scheduling when the sdata is going away.
670 if (!ieee80211_sdata_running(sdata)) {
676 * as long as no delay is required advance immediately
677 * without scheduling a new work
680 if (!ieee80211_sdata_running(sdata)) {
685 switch (local->next_scan_state) {
687 /* if no more bands/channels left, complete scan */
688 if (local->scan_channel_idx >= local->scan_req->n_channels) {
692 ieee80211_scan_state_decision(local, &next_delay);
694 case SCAN_SET_CHANNEL:
695 ieee80211_scan_state_set_channel(local, &next_delay);
697 case SCAN_SEND_PROBE:
698 ieee80211_scan_state_send_probe(local, &next_delay);
701 ieee80211_scan_state_suspend(local, &next_delay);
704 ieee80211_scan_state_resume(local, &next_delay);
707 } while (next_delay == 0);
709 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
713 hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
714 __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
716 mutex_unlock(&local->mtx);
719 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
720 struct cfg80211_scan_request *req)
724 mutex_lock(&sdata->local->mtx);
725 res = __ieee80211_start_scan(sdata, req);
726 mutex_unlock(&sdata->local->mtx);
731 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
732 const u8 *ssid, u8 ssid_len,
733 struct ieee80211_channel *chan)
735 struct ieee80211_local *local = sdata->local;
737 enum ieee80211_band band;
739 mutex_lock(&local->mtx);
745 /* fill internal scan request */
749 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
750 if (!local->hw.wiphy->bands[band])
753 i < local->hw.wiphy->bands[band]->n_channels;
755 local->int_scan_req->channels[nchan] =
756 &local->hw.wiphy->bands[band]->channels[i];
761 local->int_scan_req->n_channels = nchan;
763 local->int_scan_req->channels[0] = chan;
764 local->int_scan_req->n_channels = 1;
767 local->int_scan_req->ssids = &local->scan_ssid;
768 local->int_scan_req->n_ssids = 1;
769 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
770 local->int_scan_req->ssids[0].ssid_len = ssid_len;
772 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
774 mutex_unlock(&local->mtx);
779 * Only call this function when a scan can't be queued -- under RTNL.
781 void ieee80211_scan_cancel(struct ieee80211_local *local)
784 * We are canceling software scan, or deferred scan that was not
785 * yet really started (see __ieee80211_start_scan ).
787 * Regarding hardware scan:
788 * - we can not call __ieee80211_scan_completed() as when
789 * SCAN_HW_SCANNING bit is set this function change
790 * local->hw_scan_req to operate on 5G band, what race with
791 * driver which can use local->hw_scan_req
793 * - we can not cancel scan_work since driver can schedule it
794 * by ieee80211_scan_completed(..., true) to finish scan
796 * Hence we only call the cancel_hw_scan() callback, but the low-level
797 * driver is still responsible for calling ieee80211_scan_completed()
798 * after the scan was completed/aborted.
801 mutex_lock(&local->mtx);
802 if (!local->scan_req)
805 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
806 if (local->ops->cancel_hw_scan)
807 drv_cancel_hw_scan(local, local->scan_sdata);
812 * If the work is currently running, it must be blocked on
813 * the mutex, but we'll set scan_sdata = NULL and it'll
814 * simply exit once it acquires the mutex.
816 cancel_delayed_work(&local->scan_work);
818 __ieee80211_scan_completed(&local->hw, true, false);
820 mutex_unlock(&local->mtx);
823 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
824 struct cfg80211_sched_scan_request *req)
826 struct ieee80211_local *local = sdata->local;
829 mutex_lock(&sdata->local->mtx);
831 if (local->sched_scanning) {
836 if (!local->ops->sched_scan_start) {
841 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
842 local->sched_scan_ies.ie[i] = kzalloc(2 +
843 IEEE80211_MAX_SSID_LEN +
844 local->scan_ies_len +
847 if (!local->sched_scan_ies.ie[i]) {
852 local->sched_scan_ies.len[i] =
853 ieee80211_build_preq_ies(local,
854 local->sched_scan_ies.ie[i],
855 req->ie, req->ie_len, i,
859 ret = drv_sched_scan_start(local, sdata, req,
860 &local->sched_scan_ies);
862 local->sched_scanning = true;
868 kfree(local->sched_scan_ies.ie[--i]);
870 mutex_unlock(&sdata->local->mtx);
874 int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
876 struct ieee80211_local *local = sdata->local;
879 mutex_lock(&sdata->local->mtx);
881 if (!local->ops->sched_scan_stop) {
886 if (local->sched_scanning) {
887 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
888 kfree(local->sched_scan_ies.ie[i]);
890 drv_sched_scan_stop(local, sdata);
891 local->sched_scanning = false;
894 mutex_unlock(&sdata->local->mtx);
899 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
901 struct ieee80211_local *local = hw_to_local(hw);
903 trace_api_sched_scan_results(local);
905 cfg80211_sched_scan_results(hw->wiphy);
907 EXPORT_SYMBOL(ieee80211_sched_scan_results);
909 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
911 struct ieee80211_local *local =
912 container_of(work, struct ieee80211_local,
913 sched_scan_stopped_work);
916 mutex_lock(&local->mtx);
918 if (!local->sched_scanning) {
919 mutex_unlock(&local->mtx);
923 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
924 kfree(local->sched_scan_ies.ie[i]);
926 local->sched_scanning = false;
928 mutex_unlock(&local->mtx);
930 cfg80211_sched_scan_stopped(local->hw.wiphy);
933 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
935 struct ieee80211_local *local = hw_to_local(hw);
937 trace_api_sched_scan_stopped(local);
939 ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work);
941 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);