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 /* TODO: figure out how to avoid that the "current BSS" expires */
17 #include <linux/wireless.h>
18 #include <linux/if_arp.h>
19 #include <linux/rtnetlink.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 return (void *)cfg80211_get_bss(local
->hw
.wiphy
,
35 ieee80211_get_channel(local
->hw
.wiphy
,
37 bssid
, ssid
, ssid_len
,
41 static void ieee80211_rx_bss_free(struct cfg80211_bss
*cbss
)
43 struct ieee80211_bss
*bss
= (void *)cbss
;
45 kfree(bss_mesh_id(bss
));
46 kfree(bss_mesh_cfg(bss
));
49 void ieee80211_rx_bss_put(struct ieee80211_local
*local
,
50 struct ieee80211_bss
*bss
)
52 cfg80211_put_bss((struct cfg80211_bss
*)bss
);
55 struct ieee80211_bss
*
56 ieee80211_bss_info_update(struct ieee80211_local
*local
,
57 struct ieee80211_rx_status
*rx_status
,
58 struct ieee80211_mgmt
*mgmt
,
60 struct ieee802_11_elems
*elems
,
61 struct ieee80211_channel
*channel
,
64 struct ieee80211_bss
*bss
;
68 if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_DBM
)
69 signal
= rx_status
->signal
* 100;
70 else if (local
->hw
.flags
& IEEE80211_HW_SIGNAL_UNSPEC
)
71 signal
= (rx_status
->signal
* 100) / local
->hw
.max_signal
;
73 bss
= (void *)cfg80211_inform_bss_frame(local
->hw
.wiphy
, channel
,
74 mgmt
, len
, signal
, GFP_ATOMIC
);
79 bss
->cbss
.free_priv
= ieee80211_rx_bss_free
;
81 /* save the ERP value so that it is available at association time */
82 if (elems
->erp_info
&& elems
->erp_info_len
>= 1) {
83 bss
->erp_value
= elems
->erp_info
[0];
84 bss
->has_erp_value
= 1;
88 struct ieee80211_tim_ie
*tim_ie
=
89 (struct ieee80211_tim_ie
*)elems
->tim
;
90 bss
->dtim_period
= tim_ie
->dtim_period
;
93 /* set default value for buggy APs */
94 if (!elems
->tim
|| bss
->dtim_period
== 0)
97 bss
->supp_rates_len
= 0;
98 if (elems
->supp_rates
) {
99 clen
= IEEE80211_MAX_SUPP_RATES
- bss
->supp_rates_len
;
100 if (clen
> elems
->supp_rates_len
)
101 clen
= elems
->supp_rates_len
;
102 memcpy(&bss
->supp_rates
[bss
->supp_rates_len
], elems
->supp_rates
,
104 bss
->supp_rates_len
+= clen
;
106 if (elems
->ext_supp_rates
) {
107 clen
= IEEE80211_MAX_SUPP_RATES
- bss
->supp_rates_len
;
108 if (clen
> elems
->ext_supp_rates_len
)
109 clen
= elems
->ext_supp_rates_len
;
110 memcpy(&bss
->supp_rates
[bss
->supp_rates_len
],
111 elems
->ext_supp_rates
, clen
);
112 bss
->supp_rates_len
+= clen
;
115 bss
->wmm_used
= elems
->wmm_param
|| elems
->wmm_info
;
118 bss
->last_probe_resp
= jiffies
;
124 ieee80211_scan_rx(struct ieee80211_sub_if_data
*sdata
, struct sk_buff
*skb
)
126 struct ieee80211_rx_status
*rx_status
= IEEE80211_SKB_RXCB(skb
);
127 struct ieee80211_mgmt
*mgmt
;
128 struct ieee80211_bss
*bss
;
130 struct ieee80211_channel
*channel
;
134 bool presp
, beacon
= false;
135 struct ieee802_11_elems elems
;
138 return RX_DROP_UNUSABLE
;
140 mgmt
= (struct ieee80211_mgmt
*) skb
->data
;
141 fc
= mgmt
->frame_control
;
143 if (ieee80211_is_ctl(fc
))
147 return RX_DROP_MONITOR
;
149 presp
= ieee80211_is_probe_resp(fc
);
151 /* ignore ProbeResp to foreign address */
152 if (memcmp(mgmt
->da
, sdata
->dev
->dev_addr
, ETH_ALEN
))
153 return RX_DROP_MONITOR
;
156 elements
= mgmt
->u
.probe_resp
.variable
;
157 baselen
= offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
);
159 beacon
= ieee80211_is_beacon(fc
);
160 baselen
= offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
);
161 elements
= mgmt
->u
.beacon
.variable
;
164 if (!presp
&& !beacon
)
167 if (baselen
> skb
->len
)
168 return RX_DROP_MONITOR
;
170 ieee802_11_parse_elems(elements
, skb
->len
- baselen
, &elems
);
172 if (elems
.ds_params
&& elems
.ds_params_len
== 1)
173 freq
= ieee80211_channel_to_frequency(elems
.ds_params
[0]);
175 freq
= rx_status
->freq
;
177 channel
= ieee80211_get_channel(sdata
->local
->hw
.wiphy
, freq
);
179 if (!channel
|| channel
->flags
& IEEE80211_CHAN_DISABLED
)
180 return RX_DROP_MONITOR
;
182 bss
= ieee80211_bss_info_update(sdata
->local
, rx_status
,
183 mgmt
, skb
->len
, &elems
,
186 ieee80211_rx_bss_put(sdata
->local
, bss
);
193 * inform AP that we will go to sleep so that it will buffer the frames
196 static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data
*sdata
)
198 struct ieee80211_local
*local
= sdata
->local
;
201 /* FIXME: what to do when local->pspolling is true? */
203 del_timer_sync(&local
->dynamic_ps_timer
);
204 cancel_work_sync(&local
->dynamic_ps_enable_work
);
206 if (local
->hw
.conf
.flags
& IEEE80211_CONF_PS
) {
208 local
->hw
.conf
.flags
&= ~IEEE80211_CONF_PS
;
209 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_PS
);
212 if (!ps
|| !(local
->hw
.flags
& IEEE80211_HW_PS_NULLFUNC_STACK
))
214 * If power save was enabled, no need to send a nullfunc
215 * frame because AP knows that we are sleeping. But if the
216 * hardware is creating the nullfunc frame for power save
217 * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not
218 * enabled) and power save was enabled, the firmware just
219 * sent a null frame with power save disabled. So we need
220 * to send a new nullfunc frame to inform the AP that we
221 * are again sleeping.
223 ieee80211_send_nullfunc(local
, sdata
, 1);
226 /* inform AP that we are awake again, unless power save is enabled */
227 static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data
*sdata
)
229 struct ieee80211_local
*local
= sdata
->local
;
231 if (!local
->ps_sdata
)
232 ieee80211_send_nullfunc(local
, sdata
, 0);
235 * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
236 * will send a nullfunc frame with the powersave bit set
237 * even though the AP already knows that we are sleeping.
238 * This could be avoided by sending a null frame with power
239 * save bit disabled before enabling the power save, but
240 * this doesn't gain anything.
242 * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need
243 * to send a nullfunc frame because AP already knows that
244 * we are sleeping, let's just enable power save mode in
247 local
->hw
.conf
.flags
|= IEEE80211_CONF_PS
;
248 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_PS
);
252 static void ieee80211_restore_scan_ies(struct ieee80211_local
*local
)
254 kfree(local
->scan_req
->ie
);
255 local
->scan_req
->ie
= local
->orig_ies
;
256 local
->scan_req
->ie_len
= local
->orig_ies_len
;
259 void ieee80211_scan_completed(struct ieee80211_hw
*hw
, bool aborted
)
261 struct ieee80211_local
*local
= hw_to_local(hw
);
262 struct ieee80211_sub_if_data
*sdata
;
265 mutex_lock(&local
->scan_mtx
);
267 if (WARN_ON(!local
->scanning
)) {
268 mutex_unlock(&local
->scan_mtx
);
272 if (WARN_ON(!local
->scan_req
)) {
273 mutex_unlock(&local
->scan_mtx
);
277 if (test_bit(SCAN_HW_SCANNING
, &local
->scanning
))
278 ieee80211_restore_scan_ies(local
);
280 if (local
->scan_req
!= &local
->int_scan_req
)
281 cfg80211_scan_done(local
->scan_req
, aborted
);
282 local
->scan_req
= NULL
;
284 was_hw_scan
= test_bit(SCAN_HW_SCANNING
, &local
->scanning
);
286 local
->scan_channel
= NULL
;
288 /* we only have to protect scan_req and hw/sw scan */
289 mutex_unlock(&local
->scan_mtx
);
291 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
295 spin_lock_bh(&local
->filter_lock
);
296 local
->filter_flags
&= ~FIF_BCN_PRBRESP_PROMISC
;
297 drv_configure_filter(local
, FIF_BCN_PRBRESP_PROMISC
,
298 &local
->filter_flags
,
301 spin_unlock_bh(&local
->filter_lock
);
303 drv_sw_scan_complete(local
);
305 mutex_lock(&local
->iflist_mtx
);
306 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
307 if (!netif_running(sdata
->dev
))
310 /* Tell AP we're back */
311 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
312 if (sdata
->u
.mgd
.associated
) {
313 ieee80211_scan_ps_disable(sdata
);
314 netif_tx_wake_all_queues(sdata
->dev
);
317 netif_tx_wake_all_queues(sdata
->dev
);
319 /* re-enable beaconing */
320 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
321 sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
322 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
323 ieee80211_bss_info_change_notify(
324 sdata
, BSS_CHANGED_BEACON_ENABLED
);
326 mutex_unlock(&local
->iflist_mtx
);
329 ieee80211_recalc_idle(local
);
330 ieee80211_mlme_notify_scan_completed(local
);
331 ieee80211_ibss_notify_scan_completed(local
);
332 ieee80211_mesh_notify_scan_completed(local
);
334 EXPORT_SYMBOL(ieee80211_scan_completed
);
336 static int ieee80211_start_sw_scan(struct ieee80211_local
*local
)
338 struct ieee80211_sub_if_data
*sdata
;
341 * Hardware/driver doesn't support hw_scan, so use software
342 * scanning instead. First send a nullfunc frame with power save
343 * bit on so that AP will buffer the frames for us while we are not
344 * listening, then send probe requests to each channel and wait for
345 * the responses. After all channels are scanned, tune back to the
346 * original channel and send a nullfunc frame with power save bit
347 * off to trigger the AP to send us all the buffered frames.
349 * Note that while local->sw_scanning is true everything else but
350 * nullfunc frames and probe requests will be dropped in
351 * ieee80211_tx_h_check_assoc().
353 drv_sw_scan_start(local
);
355 mutex_lock(&local
->iflist_mtx
);
356 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
357 if (!netif_running(sdata
->dev
))
360 /* disable beaconing */
361 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
362 sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
||
363 sdata
->vif
.type
== NL80211_IFTYPE_MESH_POINT
)
364 ieee80211_bss_info_change_notify(
365 sdata
, BSS_CHANGED_BEACON_ENABLED
);
368 * only handle non-STA interfaces here, STA interfaces
369 * are handled in the scan state machine
371 if (sdata
->vif
.type
!= NL80211_IFTYPE_STATION
)
372 netif_tx_stop_all_queues(sdata
->dev
);
374 mutex_unlock(&local
->iflist_mtx
);
376 local
->next_scan_state
= SCAN_DECISION
;
377 local
->scan_channel_idx
= 0;
379 spin_lock_bh(&local
->filter_lock
);
380 local
->filter_flags
|= FIF_BCN_PRBRESP_PROMISC
;
381 drv_configure_filter(local
, FIF_BCN_PRBRESP_PROMISC
,
382 &local
->filter_flags
,
385 spin_unlock_bh(&local
->filter_lock
);
387 /* TODO: start scan as soon as all nullfunc frames are ACKed */
388 queue_delayed_work(local
->hw
.workqueue
, &local
->scan_work
,
389 IEEE80211_CHANNEL_TIME
);
395 static int __ieee80211_start_scan(struct ieee80211_sub_if_data
*sdata
,
396 struct cfg80211_scan_request
*req
)
398 struct ieee80211_local
*local
= sdata
->local
;
399 struct ieee80211_if_managed
*ifmgd
= &sdata
->u
.mgd
;
405 if (local
->ops
->hw_scan
) {
409 ies
= kmalloc(2 + IEEE80211_MAX_SSID_LEN
+
410 local
->scan_ies_len
+ req
->ie_len
, GFP_KERNEL
);
414 ielen
= ieee80211_build_preq_ies(local
, ies
,
415 req
->ie
, req
->ie_len
);
416 local
->orig_ies
= req
->ie
;
417 local
->orig_ies_len
= req
->ie_len
;
422 local
->scan_req
= req
;
423 local
->scan_sdata
= sdata
;
425 if (req
!= &local
->int_scan_req
&&
426 sdata
->vif
.type
== NL80211_IFTYPE_STATION
&&
427 !list_empty(&ifmgd
->work_list
)) {
428 /* actually wait for the work it's doing to finish/time out */
429 set_bit(IEEE80211_STA_REQ_SCAN
, &ifmgd
->request
);
433 if (local
->ops
->hw_scan
)
434 __set_bit(SCAN_HW_SCANNING
, &local
->scanning
);
436 __set_bit(SCAN_SW_SCANNING
, &local
->scanning
);
438 * Kicking off the scan need not be protected,
439 * only the scan variable stuff, since now
440 * local->scan_req is assigned and other callers
441 * will abort their scan attempts.
443 * This avoids getting a scan_mtx -> iflist_mtx
444 * dependency, so that the scan completed calls
445 * have more locking freedom.
448 ieee80211_recalc_idle(local
);
449 mutex_unlock(&local
->scan_mtx
);
451 if (local
->ops
->hw_scan
)
452 rc
= drv_hw_scan(local
, local
->scan_req
);
454 rc
= ieee80211_start_sw_scan(local
);
456 mutex_lock(&local
->scan_mtx
);
459 if (local
->ops
->hw_scan
)
460 ieee80211_restore_scan_ies(local
);
463 ieee80211_recalc_idle(local
);
465 local
->scan_req
= NULL
;
466 local
->scan_sdata
= NULL
;
472 static int ieee80211_scan_state_decision(struct ieee80211_local
*local
,
473 unsigned long *next_delay
)
475 bool associated
= false;
476 struct ieee80211_sub_if_data
*sdata
;
478 /* if no more bands/channels left, complete scan and advance to the idle state */
479 if (local
->scan_channel_idx
>= local
->scan_req
->n_channels
) {
480 ieee80211_scan_completed(&local
->hw
, false);
484 /* check if at least one STA interface is associated */
485 mutex_lock(&local
->iflist_mtx
);
486 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
487 if (!netif_running(sdata
->dev
))
490 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
491 if (sdata
->u
.mgd
.associated
) {
497 mutex_unlock(&local
->iflist_mtx
);
499 if (local
->scan_channel
) {
501 * we're currently scanning a different channel, let's
502 * switch back to the operating channel now if at least
503 * one interface is associated. Otherwise just scan the
507 local
->next_scan_state
= SCAN_ENTER_OPER_CHANNEL
;
509 local
->next_scan_state
= SCAN_SET_CHANNEL
;
512 * we're on the operating channel currently, let's
513 * leave that channel now to scan another one
515 local
->next_scan_state
= SCAN_LEAVE_OPER_CHANNEL
;
522 static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local
*local
,
523 unsigned long *next_delay
)
525 struct ieee80211_sub_if_data
*sdata
;
528 * notify the AP about us leaving the channel and stop all STA interfaces
530 mutex_lock(&local
->iflist_mtx
);
531 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
532 if (!netif_running(sdata
->dev
))
535 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
536 netif_tx_stop_all_queues(sdata
->dev
);
537 if (sdata
->u
.mgd
.associated
)
538 ieee80211_scan_ps_enable(sdata
);
541 mutex_unlock(&local
->iflist_mtx
);
543 __set_bit(SCAN_OFF_CHANNEL
, &local
->scanning
);
545 /* advance to the next channel to be scanned */
546 *next_delay
= HZ
/ 10;
547 local
->next_scan_state
= SCAN_SET_CHANNEL
;
550 static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local
*local
,
551 unsigned long *next_delay
)
553 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
555 /* switch back to the operating channel */
556 local
->scan_channel
= NULL
;
557 ieee80211_hw_config(local
, IEEE80211_CONF_CHANGE_CHANNEL
);
560 * notify the AP about us being back and restart all STA interfaces
562 mutex_lock(&local
->iflist_mtx
);
563 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
564 if (!netif_running(sdata
->dev
))
567 /* Tell AP we're back */
568 if (sdata
->vif
.type
== NL80211_IFTYPE_STATION
) {
569 if (sdata
->u
.mgd
.associated
)
570 ieee80211_scan_ps_disable(sdata
);
571 netif_tx_wake_all_queues(sdata
->dev
);
574 mutex_unlock(&local
->iflist_mtx
);
576 __clear_bit(SCAN_OFF_CHANNEL
, &local
->scanning
);
578 *next_delay
= HZ
/ 5;
579 local
->next_scan_state
= SCAN_DECISION
;
582 static void ieee80211_scan_state_set_channel(struct ieee80211_local
*local
,
583 unsigned long *next_delay
)
586 struct ieee80211_channel
*chan
;
587 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
590 chan
= local
->scan_req
->channels
[local
->scan_channel_idx
];
592 if (chan
->flags
& IEEE80211_CHAN_DISABLED
||
593 (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
&&
594 chan
->flags
& IEEE80211_CHAN_NO_IBSS
))
598 local
->scan_channel
= chan
;
599 if (ieee80211_hw_config(local
,
600 IEEE80211_CONF_CHANGE_CHANNEL
))
604 /* advance state machine to next channel/band */
605 local
->scan_channel_idx
++;
608 /* if we skip this channel return to the decision state */
609 local
->next_scan_state
= SCAN_DECISION
;
614 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
615 * (which unfortunately doesn't say _why_ step a) is done,
616 * but it waits for the probe delay or until a frame is
617 * received - and the received frame would update the NAV).
618 * For now, we do not support waiting until a frame is
621 * In any case, it is not necessary for a passive scan.
623 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
||
624 !local
->scan_req
->n_ssids
) {
625 *next_delay
= IEEE80211_PASSIVE_CHANNEL_TIME
;
626 local
->next_scan_state
= SCAN_DECISION
;
630 /* active scan, send probes */
631 *next_delay
= IEEE80211_PROBE_DELAY
;
632 local
->next_scan_state
= SCAN_SEND_PROBE
;
635 static void ieee80211_scan_state_send_probe(struct ieee80211_local
*local
,
636 unsigned long *next_delay
)
639 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
641 for (i
= 0; i
< local
->scan_req
->n_ssids
; i
++)
642 ieee80211_send_probe_req(
644 local
->scan_req
->ssids
[i
].ssid
,
645 local
->scan_req
->ssids
[i
].ssid_len
,
646 local
->scan_req
->ie
, local
->scan_req
->ie_len
);
649 * After sending probe requests, wait for probe responses
652 *next_delay
= IEEE80211_CHANNEL_TIME
;
653 local
->next_scan_state
= SCAN_DECISION
;
656 void ieee80211_scan_work(struct work_struct
*work
)
658 struct ieee80211_local
*local
=
659 container_of(work
, struct ieee80211_local
, scan_work
.work
);
660 struct ieee80211_sub_if_data
*sdata
= local
->scan_sdata
;
661 unsigned long next_delay
= 0;
663 mutex_lock(&local
->scan_mtx
);
664 if (!sdata
|| !local
->scan_req
) {
665 mutex_unlock(&local
->scan_mtx
);
669 if (local
->scan_req
&& !local
->scanning
) {
670 struct cfg80211_scan_request
*req
= local
->scan_req
;
673 local
->scan_req
= NULL
;
675 rc
= __ieee80211_start_scan(sdata
, req
);
676 mutex_unlock(&local
->scan_mtx
);
679 ieee80211_scan_completed(&local
->hw
, true);
683 mutex_unlock(&local
->scan_mtx
);
686 * Avoid re-scheduling when the sdata is going away.
688 if (!netif_running(sdata
->dev
)) {
689 ieee80211_scan_completed(&local
->hw
, true);
694 * as long as no delay is required advance immediately
695 * without scheduling a new work
698 switch (local
->next_scan_state
) {
700 if (ieee80211_scan_state_decision(local
, &next_delay
))
703 case SCAN_SET_CHANNEL
:
704 ieee80211_scan_state_set_channel(local
, &next_delay
);
706 case SCAN_SEND_PROBE
:
707 ieee80211_scan_state_send_probe(local
, &next_delay
);
709 case SCAN_LEAVE_OPER_CHANNEL
:
710 ieee80211_scan_state_leave_oper_channel(local
, &next_delay
);
712 case SCAN_ENTER_OPER_CHANNEL
:
713 ieee80211_scan_state_enter_oper_channel(local
, &next_delay
);
716 } while (next_delay
== 0);
718 queue_delayed_work(local
->hw
.workqueue
, &local
->scan_work
,
722 int ieee80211_request_scan(struct ieee80211_sub_if_data
*sdata
,
723 struct cfg80211_scan_request
*req
)
727 mutex_lock(&sdata
->local
->scan_mtx
);
728 res
= __ieee80211_start_scan(sdata
, req
);
729 mutex_unlock(&sdata
->local
->scan_mtx
);
734 int ieee80211_request_internal_scan(struct ieee80211_sub_if_data
*sdata
,
735 const u8
*ssid
, u8 ssid_len
)
737 struct ieee80211_local
*local
= sdata
->local
;
740 mutex_lock(&local
->scan_mtx
);
746 memcpy(local
->int_scan_req
.ssids
[0].ssid
, ssid
, IEEE80211_MAX_SSID_LEN
);
747 local
->int_scan_req
.ssids
[0].ssid_len
= ssid_len
;
749 ret
= __ieee80211_start_scan(sdata
, &sdata
->local
->int_scan_req
);
751 mutex_unlock(&local
->scan_mtx
);
755 void ieee80211_scan_cancel(struct ieee80211_local
*local
)
759 cancel_delayed_work_sync(&local
->scan_work
);
762 * Only call this function when a scan can't be
763 * queued -- mostly at suspend under RTNL.
765 mutex_lock(&local
->scan_mtx
);
766 swscan
= test_bit(SCAN_SW_SCANNING
, &local
->scanning
);
767 mutex_unlock(&local
->scan_mtx
);
770 ieee80211_scan_completed(&local
->hw
, true);