1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/slab.h>
29 #include <linux/types.h>
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
32
33 #include "iwl-eeprom.h"
34 #include "iwl-dev.h"
35 #include "iwl-core.h"
36 #include "iwl-sta.h"
37 #include "iwl-io.h"
38 #include "iwl-helpers.h"
39
40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
41 * sending probe req. This should be set long enough to hear probe responses
42 * from more than one AP. */
43 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44 #define IWL_ACTIVE_DWELL_TIME_52 (20)
45
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
48
49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
50 * Must be set longer than active dwell time.
51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
52 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
53 #define IWL_PASSIVE_DWELL_TIME_52 (10)
54 #define IWL_PASSIVE_DWELL_BASE (100)
55 #define IWL_CHANNEL_TUNE_TIME 5
56
iwl_legacy_send_scan_abort(struct iwl_priv * priv)57 static int iwl_legacy_send_scan_abort(struct iwl_priv *priv)
58 {
59 int ret;
60 struct iwl_rx_packet *pkt;
61 struct iwl_host_cmd cmd = {
62 .id = REPLY_SCAN_ABORT_CMD,
63 .flags = CMD_WANT_SKB,
64 };
65
66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
69 if (!test_bit(STATUS_READY, &priv->status) ||
70 !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
71 !test_bit(STATUS_SCAN_HW, &priv->status) ||
72 test_bit(STATUS_FW_ERROR, &priv->status) ||
73 test_bit(STATUS_EXIT_PENDING, &priv->status))
74 return -EIO;
75
76 ret = iwl_legacy_send_cmd_sync(priv, &cmd);
77 if (ret)
78 return ret;
79
80 pkt = (struct iwl_rx_packet *)cmd.reply_page;
81 if (pkt->u.status != CAN_ABORT_STATUS) {
82 /* The scan abort will return 1 for success or
83 * 2 for "failure". A failure condition can be
84 * due to simply not being in an active scan which
85 * can occur if we send the scan abort before we
86 * the microcode has notified us that a scan is
87 * completed. */
88 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
89 ret = -EIO;
90 }
91
92 iwl_legacy_free_pages(priv, cmd.reply_page);
93 return ret;
94 }
95
iwl_legacy_complete_scan(struct iwl_priv * priv,bool aborted)96 static void iwl_legacy_complete_scan(struct iwl_priv *priv, bool aborted)
97 {
98 /* check if scan was requested from mac80211 */
99 if (priv->scan_request) {
100 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
101 ieee80211_scan_completed(priv->hw, aborted);
102 }
103
104 priv->is_internal_short_scan = false;
105 priv->scan_vif = NULL;
106 priv->scan_request = NULL;
107 }
108
iwl_legacy_force_scan_end(struct iwl_priv * priv)109 void iwl_legacy_force_scan_end(struct iwl_priv *priv)
110 {
111 lockdep_assert_held(&priv->mutex);
112
113 if (!test_bit(STATUS_SCANNING, &priv->status)) {
114 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
115 return;
116 }
117
118 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
119 clear_bit(STATUS_SCANNING, &priv->status);
120 clear_bit(STATUS_SCAN_HW, &priv->status);
121 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
122 iwl_legacy_complete_scan(priv, true);
123 }
124
iwl_legacy_do_scan_abort(struct iwl_priv * priv)125 static void iwl_legacy_do_scan_abort(struct iwl_priv *priv)
126 {
127 int ret;
128
129 lockdep_assert_held(&priv->mutex);
130
131 if (!test_bit(STATUS_SCANNING, &priv->status)) {
132 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
133 return;
134 }
135
136 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
137 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
138 return;
139 }
140
141 ret = iwl_legacy_send_scan_abort(priv);
142 if (ret) {
143 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
144 iwl_legacy_force_scan_end(priv);
145 } else
146 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
147 }
148
149 /**
150 * iwl_scan_cancel - Cancel any currently executing HW scan
151 */
iwl_legacy_scan_cancel(struct iwl_priv * priv)152 int iwl_legacy_scan_cancel(struct iwl_priv *priv)
153 {
154 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
155 queue_work(priv->workqueue, &priv->abort_scan);
156 return 0;
157 }
158 EXPORT_SYMBOL(iwl_legacy_scan_cancel);
159
160 /**
161 * iwl_legacy_scan_cancel_timeout - Cancel any currently executing HW scan
162 * @ms: amount of time to wait (in milliseconds) for scan to abort
163 *
164 */
iwl_legacy_scan_cancel_timeout(struct iwl_priv * priv,unsigned long ms)165 int iwl_legacy_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
166 {
167 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
168
169 lockdep_assert_held(&priv->mutex);
170
171 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
172
173 iwl_legacy_do_scan_abort(priv);
174
175 while (time_before_eq(jiffies, timeout)) {
176 if (!test_bit(STATUS_SCAN_HW, &priv->status))
177 break;
178 msleep(20);
179 }
180
181 return test_bit(STATUS_SCAN_HW, &priv->status);
182 }
183 EXPORT_SYMBOL(iwl_legacy_scan_cancel_timeout);
184
185 /* Service response to REPLY_SCAN_CMD (0x80) */
iwl_legacy_rx_reply_scan(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb)186 static void iwl_legacy_rx_reply_scan(struct iwl_priv *priv,
187 struct iwl_rx_mem_buffer *rxb)
188 {
189 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
190 struct iwl_rx_packet *pkt = rxb_addr(rxb);
191 struct iwl_scanreq_notification *notif =
192 (struct iwl_scanreq_notification *)pkt->u.raw;
193
194 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
195 #endif
196 }
197
198 /* Service SCAN_START_NOTIFICATION (0x82) */
iwl_legacy_rx_scan_start_notif(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb)199 static void iwl_legacy_rx_scan_start_notif(struct iwl_priv *priv,
200 struct iwl_rx_mem_buffer *rxb)
201 {
202 struct iwl_rx_packet *pkt = rxb_addr(rxb);
203 struct iwl_scanstart_notification *notif =
204 (struct iwl_scanstart_notification *)pkt->u.raw;
205 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
206 IWL_DEBUG_SCAN(priv, "Scan start: "
207 "%d [802.11%s] "
208 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
209 notif->channel,
210 notif->band ? "bg" : "a",
211 le32_to_cpu(notif->tsf_high),
212 le32_to_cpu(notif->tsf_low),
213 notif->status, notif->beacon_timer);
214 }
215
216 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
iwl_legacy_rx_scan_results_notif(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb)217 static void iwl_legacy_rx_scan_results_notif(struct iwl_priv *priv,
218 struct iwl_rx_mem_buffer *rxb)
219 {
220 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
221 struct iwl_rx_packet *pkt = rxb_addr(rxb);
222 struct iwl_scanresults_notification *notif =
223 (struct iwl_scanresults_notification *)pkt->u.raw;
224
225 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
226 "%d [802.11%s] "
227 "(TSF: 0x%08X:%08X) - %d "
228 "elapsed=%lu usec\n",
229 notif->channel,
230 notif->band ? "bg" : "a",
231 le32_to_cpu(notif->tsf_high),
232 le32_to_cpu(notif->tsf_low),
233 le32_to_cpu(notif->statistics[0]),
234 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
235 #endif
236 }
237
238 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
iwl_legacy_rx_scan_complete_notif(struct iwl_priv * priv,struct iwl_rx_mem_buffer * rxb)239 static void iwl_legacy_rx_scan_complete_notif(struct iwl_priv *priv,
240 struct iwl_rx_mem_buffer *rxb)
241 {
242
243 #ifdef CONFIG_IWLWIFI_LEGACY_DEBUG
244 struct iwl_rx_packet *pkt = rxb_addr(rxb);
245 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
246 #endif
247
248 IWL_DEBUG_SCAN(priv,
249 "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
250 scan_notif->scanned_channels,
251 scan_notif->tsf_low,
252 scan_notif->tsf_high, scan_notif->status);
253
254 /* The HW is no longer scanning */
255 clear_bit(STATUS_SCAN_HW, &priv->status);
256
257 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
258 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
259 jiffies_to_msecs(jiffies - priv->scan_start));
260
261 queue_work(priv->workqueue, &priv->scan_completed);
262 }
263
iwl_legacy_setup_rx_scan_handlers(struct iwl_priv * priv)264 void iwl_legacy_setup_rx_scan_handlers(struct iwl_priv *priv)
265 {
266 /* scan handlers */
267 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_legacy_rx_reply_scan;
268 priv->rx_handlers[SCAN_START_NOTIFICATION] =
269 iwl_legacy_rx_scan_start_notif;
270 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
271 iwl_legacy_rx_scan_results_notif;
272 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
273 iwl_legacy_rx_scan_complete_notif;
274 }
275 EXPORT_SYMBOL(iwl_legacy_setup_rx_scan_handlers);
276
iwl_legacy_get_active_dwell_time(struct iwl_priv * priv,enum ieee80211_band band,u8 n_probes)277 inline u16 iwl_legacy_get_active_dwell_time(struct iwl_priv *priv,
278 enum ieee80211_band band,
279 u8 n_probes)
280 {
281 if (band == IEEE80211_BAND_5GHZ)
282 return IWL_ACTIVE_DWELL_TIME_52 +
283 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
284 else
285 return IWL_ACTIVE_DWELL_TIME_24 +
286 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
287 }
288 EXPORT_SYMBOL(iwl_legacy_get_active_dwell_time);
289
iwl_legacy_get_passive_dwell_time(struct iwl_priv * priv,enum ieee80211_band band,struct ieee80211_vif * vif)290 u16 iwl_legacy_get_passive_dwell_time(struct iwl_priv *priv,
291 enum ieee80211_band band,
292 struct ieee80211_vif *vif)
293 {
294 struct iwl_rxon_context *ctx;
295 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
296 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
297 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
298
299 if (iwl_legacy_is_any_associated(priv)) {
300 /*
301 * If we're associated, we clamp the maximum passive
302 * dwell time to be 98% of the smallest beacon interval
303 * (minus 2 * channel tune time)
304 */
305 for_each_context(priv, ctx) {
306 u16 value;
307
308 if (!iwl_legacy_is_associated_ctx(ctx))
309 continue;
310 value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
311 if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
312 value = IWL_PASSIVE_DWELL_BASE;
313 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
314 passive = min(value, passive);
315 }
316 }
317
318 return passive;
319 }
320 EXPORT_SYMBOL(iwl_legacy_get_passive_dwell_time);
321
iwl_legacy_init_scan_params(struct iwl_priv * priv)322 void iwl_legacy_init_scan_params(struct iwl_priv *priv)
323 {
324 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
325 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
326 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
327 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
328 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
329 }
330 EXPORT_SYMBOL(iwl_legacy_init_scan_params);
331
iwl_legacy_scan_initiate(struct iwl_priv * priv,struct ieee80211_vif * vif,bool internal,enum ieee80211_band band)332 static int __must_check iwl_legacy_scan_initiate(struct iwl_priv *priv,
333 struct ieee80211_vif *vif,
334 bool internal,
335 enum ieee80211_band band)
336 {
337 int ret;
338
339 lockdep_assert_held(&priv->mutex);
340
341 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
342 return -EOPNOTSUPP;
343
344 cancel_delayed_work(&priv->scan_check);
345
346 if (!iwl_legacy_is_ready_rf(priv)) {
347 IWL_WARN(priv, "Request scan called when driver not ready.\n");
348 return -EIO;
349 }
350
351 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
352 IWL_DEBUG_SCAN(priv,
353 "Multiple concurrent scan requests in parallel.\n");
354 return -EBUSY;
355 }
356
357 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
358 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
359 return -EBUSY;
360 }
361
362 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
363 internal ? "internal short " : "");
364
365 set_bit(STATUS_SCANNING, &priv->status);
366 priv->is_internal_short_scan = internal;
367 priv->scan_start = jiffies;
368 priv->scan_band = band;
369
370 ret = priv->cfg->ops->utils->request_scan(priv, vif);
371 if (ret) {
372 clear_bit(STATUS_SCANNING, &priv->status);
373 priv->is_internal_short_scan = false;
374 return ret;
375 }
376
377 queue_delayed_work(priv->workqueue, &priv->scan_check,
378 IWL_SCAN_CHECK_WATCHDOG);
379
380 return 0;
381 }
382
iwl_legacy_mac_hw_scan(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct cfg80211_scan_request * req)383 int iwl_legacy_mac_hw_scan(struct ieee80211_hw *hw,
384 struct ieee80211_vif *vif,
385 struct cfg80211_scan_request *req)
386 {
387 struct iwl_priv *priv = hw->priv;
388 int ret;
389
390 IWL_DEBUG_MAC80211(priv, "enter\n");
391
392 if (req->n_channels == 0)
393 return -EINVAL;
394
395 mutex_lock(&priv->mutex);
396
397 if (test_bit(STATUS_SCANNING, &priv->status) &&
398 !priv->is_internal_short_scan) {
399 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
400 ret = -EAGAIN;
401 goto out_unlock;
402 }
403
404 /* mac80211 will only ask for one band at a time */
405 priv->scan_request = req;
406 priv->scan_vif = vif;
407
408 /*
409 * If an internal scan is in progress, just set
410 * up the scan_request as per above.
411 */
412 if (priv->is_internal_short_scan) {
413 IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
414 ret = 0;
415 } else
416 ret = iwl_legacy_scan_initiate(priv, vif, false,
417 req->channels[0]->band);
418
419 IWL_DEBUG_MAC80211(priv, "leave\n");
420
421 out_unlock:
422 mutex_unlock(&priv->mutex);
423
424 return ret;
425 }
426 EXPORT_SYMBOL(iwl_legacy_mac_hw_scan);
427
428 /*
429 * internal short scan, this function should only been called while associated.
430 * It will reset and tune the radio to prevent possible RF related problem
431 */
iwl_legacy_internal_short_hw_scan(struct iwl_priv * priv)432 void iwl_legacy_internal_short_hw_scan(struct iwl_priv *priv)
433 {
434 queue_work(priv->workqueue, &priv->start_internal_scan);
435 }
436
iwl_legacy_bg_start_internal_scan(struct work_struct * work)437 static void iwl_legacy_bg_start_internal_scan(struct work_struct *work)
438 {
439 struct iwl_priv *priv =
440 container_of(work, struct iwl_priv, start_internal_scan);
441
442 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
443
444 mutex_lock(&priv->mutex);
445
446 if (priv->is_internal_short_scan == true) {
447 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
448 goto unlock;
449 }
450
451 if (test_bit(STATUS_SCANNING, &priv->status)) {
452 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
453 goto unlock;
454 }
455
456 if (iwl_legacy_scan_initiate(priv, NULL, true, priv->band))
457 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
458 unlock:
459 mutex_unlock(&priv->mutex);
460 }
461
iwl_legacy_bg_scan_check(struct work_struct * data)462 static void iwl_legacy_bg_scan_check(struct work_struct *data)
463 {
464 struct iwl_priv *priv =
465 container_of(data, struct iwl_priv, scan_check.work);
466
467 IWL_DEBUG_SCAN(priv, "Scan check work\n");
468
469 /* Since we are here firmware does not finish scan and
470 * most likely is in bad shape, so we don't bother to
471 * send abort command, just force scan complete to mac80211 */
472 mutex_lock(&priv->mutex);
473 iwl_legacy_force_scan_end(priv);
474 mutex_unlock(&priv->mutex);
475 }
476
477 /**
478 * iwl_legacy_fill_probe_req - fill in all required fields and IE for probe request
479 */
480
481 u16
iwl_legacy_fill_probe_req(struct iwl_priv * priv,struct ieee80211_mgmt * frame,const u8 * ta,const u8 * ies,int ie_len,int left)482 iwl_legacy_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
483 const u8 *ta, const u8 *ies, int ie_len, int left)
484 {
485 int len = 0;
486 u8 *pos = NULL;
487
488 /* Make sure there is enough space for the probe request,
489 * two mandatory IEs and the data */
490 left -= 24;
491 if (left < 0)
492 return 0;
493
494 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
495 memcpy(frame->da, iwlegacy_bcast_addr, ETH_ALEN);
496 memcpy(frame->sa, ta, ETH_ALEN);
497 memcpy(frame->bssid, iwlegacy_bcast_addr, ETH_ALEN);
498 frame->seq_ctrl = 0;
499
500 len += 24;
501
502 /* ...next IE... */
503 pos = &frame->u.probe_req.variable[0];
504
505 /* fill in our indirect SSID IE */
506 left -= 2;
507 if (left < 0)
508 return 0;
509 *pos++ = WLAN_EID_SSID;
510 *pos++ = 0;
511
512 len += 2;
513
514 if (WARN_ON(left < ie_len))
515 return len;
516
517 if (ies && ie_len) {
518 memcpy(pos, ies, ie_len);
519 len += ie_len;
520 }
521
522 return (u16)len;
523 }
524 EXPORT_SYMBOL(iwl_legacy_fill_probe_req);
525
iwl_legacy_bg_abort_scan(struct work_struct * work)526 static void iwl_legacy_bg_abort_scan(struct work_struct *work)
527 {
528 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
529
530 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
531
532 /* We keep scan_check work queued in case when firmware will not
533 * report back scan completed notification */
534 mutex_lock(&priv->mutex);
535 iwl_legacy_scan_cancel_timeout(priv, 200);
536 mutex_unlock(&priv->mutex);
537 }
538
iwl_legacy_bg_scan_completed(struct work_struct * work)539 static void iwl_legacy_bg_scan_completed(struct work_struct *work)
540 {
541 struct iwl_priv *priv =
542 container_of(work, struct iwl_priv, scan_completed);
543 bool aborted;
544
545 IWL_DEBUG_SCAN(priv, "Completed %sscan.\n",
546 priv->is_internal_short_scan ? "internal short " : "");
547
548 cancel_delayed_work(&priv->scan_check);
549
550 mutex_lock(&priv->mutex);
551
552 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
553 if (aborted)
554 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
555
556 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
557 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
558 goto out_settings;
559 }
560
561 if (priv->is_internal_short_scan && !aborted) {
562 int err;
563
564 /* Check if mac80211 requested scan during our internal scan */
565 if (priv->scan_request == NULL)
566 goto out_complete;
567
568 /* If so request a new scan */
569 err = iwl_legacy_scan_initiate(priv, priv->scan_vif, false,
570 priv->scan_request->channels[0]->band);
571 if (err) {
572 IWL_DEBUG_SCAN(priv,
573 "failed to initiate pending scan: %d\n", err);
574 aborted = true;
575 goto out_complete;
576 }
577
578 goto out;
579 }
580
581 out_complete:
582 iwl_legacy_complete_scan(priv, aborted);
583
584 out_settings:
585 /* Can we still talk to firmware ? */
586 if (!iwl_legacy_is_ready_rf(priv))
587 goto out;
588
589 /*
590 * We do not commit power settings while scan is pending,
591 * do it now if the settings changed.
592 */
593 iwl_legacy_power_set_mode(priv, &priv->power_data.sleep_cmd_next,
594 false);
595 iwl_legacy_set_tx_power(priv, priv->tx_power_next, false);
596
597 priv->cfg->ops->utils->post_scan(priv);
598
599 out:
600 mutex_unlock(&priv->mutex);
601 }
602
iwl_legacy_setup_scan_deferred_work(struct iwl_priv * priv)603 void iwl_legacy_setup_scan_deferred_work(struct iwl_priv *priv)
604 {
605 INIT_WORK(&priv->scan_completed, iwl_legacy_bg_scan_completed);
606 INIT_WORK(&priv->abort_scan, iwl_legacy_bg_abort_scan);
607 INIT_WORK(&priv->start_internal_scan,
608 iwl_legacy_bg_start_internal_scan);
609 INIT_DELAYED_WORK(&priv->scan_check, iwl_legacy_bg_scan_check);
610 }
611 EXPORT_SYMBOL(iwl_legacy_setup_scan_deferred_work);
612
iwl_legacy_cancel_scan_deferred_work(struct iwl_priv * priv)613 void iwl_legacy_cancel_scan_deferred_work(struct iwl_priv *priv)
614 {
615 cancel_work_sync(&priv->start_internal_scan);
616 cancel_work_sync(&priv->abort_scan);
617 cancel_work_sync(&priv->scan_completed);
618
619 if (cancel_delayed_work_sync(&priv->scan_check)) {
620 mutex_lock(&priv->mutex);
621 iwl_legacy_force_scan_end(priv);
622 mutex_unlock(&priv->mutex);
623 }
624 }
625 EXPORT_SYMBOL(iwl_legacy_cancel_scan_deferred_work);
626