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Commit | Line | Data |
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0a51b27e | 1 | /* |
5484e237 JB |
2 | * Scanning implementation |
3 | * | |
0a51b27e JB |
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 | * | |
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. | |
13 | */ | |
14 | ||
0a51b27e | 15 | #include <linux/if_arp.h> |
888d04df | 16 | #include <linux/etherdevice.h> |
078e1e60 | 17 | #include <linux/rtnetlink.h> |
e8db0be1 | 18 | #include <linux/pm_qos.h> |
df13cce5 | 19 | #include <net/sch_generic.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
bc3b2d7f | 21 | #include <linux/export.h> |
0a51b27e | 22 | #include <net/mac80211.h> |
0a51b27e JB |
23 | |
24 | #include "ieee80211_i.h" | |
24487981 | 25 | #include "driver-ops.h" |
5484e237 | 26 | #include "mesh.h" |
0a51b27e JB |
27 | |
28 | #define IEEE80211_PROBE_DELAY (HZ / 33) | |
29 | #define IEEE80211_CHANNEL_TIME (HZ / 33) | |
3f892b61 | 30 | #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9) |
0a51b27e | 31 | |
5484e237 | 32 | void ieee80211_rx_bss_put(struct ieee80211_local *local, |
c2b13452 | 33 | struct ieee80211_bss *bss) |
5484e237 | 34 | { |
0c1ad2ca JB |
35 | if (!bss) |
36 | return; | |
5b112d3d JB |
37 | cfg80211_put_bss(local->hw.wiphy, |
38 | container_of((void *)bss, struct cfg80211_bss, priv)); | |
5484e237 JB |
39 | } |
40 | ||
ab13315a KV |
41 | static bool is_uapsd_supported(struct ieee802_11_elems *elems) |
42 | { | |
43 | u8 qos_info; | |
44 | ||
45 | if (elems->wmm_info && elems->wmm_info_len == 7 | |
46 | && elems->wmm_info[5] == 1) | |
47 | qos_info = elems->wmm_info[6]; | |
48 | else if (elems->wmm_param && elems->wmm_param_len == 24 | |
49 | && elems->wmm_param[5] == 1) | |
50 | qos_info = elems->wmm_param[6]; | |
51 | else | |
52 | /* no valid wmm information or parameter element found */ | |
53 | return false; | |
54 | ||
55 | return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD; | |
56 | } | |
57 | ||
c2b13452 | 58 | struct ieee80211_bss * |
5484e237 JB |
59 | ieee80211_bss_info_update(struct ieee80211_local *local, |
60 | struct ieee80211_rx_status *rx_status, | |
d45c4172 | 61 | struct ieee80211_mgmt *mgmt, size_t len, |
5484e237 | 62 | struct ieee802_11_elems *elems, |
d45c4172 | 63 | struct ieee80211_channel *channel) |
5484e237 | 64 | { |
d45c4172 | 65 | bool beacon = ieee80211_is_beacon(mgmt->frame_control); |
0c1ad2ca | 66 | struct cfg80211_bss *cbss; |
c2b13452 | 67 | struct ieee80211_bss *bss; |
f0b058b6 | 68 | int clen, srlen; |
2a519311 JB |
69 | s32 signal = 0; |
70 | ||
77965c97 | 71 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
2a519311 | 72 | signal = rx_status->signal * 100; |
77965c97 | 73 | else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC) |
2a519311 | 74 | signal = (rx_status->signal * 100) / local->hw.max_signal; |
2a519311 | 75 | |
0c1ad2ca JB |
76 | cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel, |
77 | mgmt, len, signal, GFP_ATOMIC); | |
0c1ad2ca | 78 | if (!cbss) |
00d3f14c JB |
79 | return NULL; |
80 | ||
0c1ad2ca | 81 | bss = (void *)cbss->priv; |
5484e237 | 82 | |
8c358bcd JB |
83 | bss->device_ts = rx_status->device_timestamp; |
84 | ||
fcff4f10 PS |
85 | if (elems->parse_error) { |
86 | if (beacon) | |
87 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON; | |
88 | else | |
89 | bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
90 | } else { | |
91 | if (beacon) | |
92 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON; | |
93 | else | |
94 | bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP; | |
95 | } | |
96 | ||
5484e237 | 97 | /* save the ERP value so that it is available at association time */ |
fcff4f10 PS |
98 | if (elems->erp_info && elems->erp_info_len >= 1 && |
99 | (!elems->parse_error || | |
100 | !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) { | |
5484e237 | 101 | bss->erp_value = elems->erp_info[0]; |
3db1cd5c | 102 | bss->has_erp_value = true; |
fcff4f10 PS |
103 | if (!elems->parse_error) |
104 | bss->valid_data |= IEEE80211_BSS_VALID_ERP; | |
5484e237 JB |
105 | } |
106 | ||
f0b058b6 | 107 | /* replace old supported rates if we get new values */ |
fcff4f10 PS |
108 | if (!elems->parse_error || |
109 | !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) { | |
110 | srlen = 0; | |
111 | if (elems->supp_rates) { | |
112 | clen = IEEE80211_MAX_SUPP_RATES; | |
113 | if (clen > elems->supp_rates_len) | |
114 | clen = elems->supp_rates_len; | |
115 | memcpy(bss->supp_rates, elems->supp_rates, clen); | |
116 | srlen += clen; | |
117 | } | |
118 | if (elems->ext_supp_rates) { | |
119 | clen = IEEE80211_MAX_SUPP_RATES - srlen; | |
120 | if (clen > elems->ext_supp_rates_len) | |
121 | clen = elems->ext_supp_rates_len; | |
122 | memcpy(bss->supp_rates + srlen, elems->ext_supp_rates, | |
123 | clen); | |
124 | srlen += clen; | |
125 | } | |
126 | if (srlen) { | |
127 | bss->supp_rates_len = srlen; | |
128 | if (!elems->parse_error) | |
129 | bss->valid_data |= IEEE80211_BSS_VALID_RATES; | |
130 | } | |
5484e237 | 131 | } |
5484e237 | 132 | |
fcff4f10 PS |
133 | if (!elems->parse_error || |
134 | !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) { | |
135 | bss->wmm_used = elems->wmm_param || elems->wmm_info; | |
136 | bss->uapsd_supported = is_uapsd_supported(elems); | |
137 | if (!elems->parse_error) | |
138 | bss->valid_data |= IEEE80211_BSS_VALID_WMM; | |
139 | } | |
5484e237 | 140 | |
5484e237 JB |
141 | return bss; |
142 | } | |
0a51b27e | 143 | |
d48b2968 | 144 | void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb) |
98c8fccf | 145 | { |
f1d58c25 | 146 | struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
d48b2968 JB |
147 | struct ieee80211_sub_if_data *sdata1, *sdata2; |
148 | struct ieee80211_mgmt *mgmt = (void *)skb->data; | |
c2b13452 | 149 | struct ieee80211_bss *bss; |
98c8fccf JB |
150 | u8 *elements; |
151 | struct ieee80211_channel *channel; | |
152 | size_t baselen; | |
d48b2968 | 153 | bool beacon; |
98c8fccf JB |
154 | struct ieee802_11_elems elems; |
155 | ||
d48b2968 JB |
156 | if (skb->len < 24 || |
157 | (!ieee80211_is_probe_resp(mgmt->frame_control) && | |
158 | !ieee80211_is_beacon(mgmt->frame_control))) | |
159 | return; | |
98c8fccf | 160 | |
d48b2968 JB |
161 | sdata1 = rcu_dereference(local->scan_sdata); |
162 | sdata2 = rcu_dereference(local->sched_scan_sdata); | |
98c8fccf | 163 | |
d48b2968 JB |
164 | if (likely(!sdata1 && !sdata2)) |
165 | return; | |
98c8fccf | 166 | |
d48b2968 | 167 | if (ieee80211_is_probe_resp(mgmt->frame_control)) { |
98c8fccf | 168 | /* ignore ProbeResp to foreign address */ |
d48b2968 JB |
169 | if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) && |
170 | (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr))) | |
171 | return; | |
98c8fccf | 172 | |
98c8fccf JB |
173 | elements = mgmt->u.probe_resp.variable; |
174 | baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable); | |
d48b2968 | 175 | beacon = false; |
98c8fccf | 176 | } else { |
98c8fccf JB |
177 | baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable); |
178 | elements = mgmt->u.beacon.variable; | |
d48b2968 | 179 | beacon = true; |
98c8fccf JB |
180 | } |
181 | ||
98c8fccf | 182 | if (baselen > skb->len) |
d48b2968 | 183 | return; |
98c8fccf JB |
184 | |
185 | ieee802_11_parse_elems(elements, skb->len - baselen, &elems); | |
186 | ||
0172bb75 | 187 | channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); |
98c8fccf JB |
188 | |
189 | if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) | |
d48b2968 | 190 | return; |
98c8fccf | 191 | |
d48b2968 | 192 | bss = ieee80211_bss_info_update(local, rx_status, |
98c8fccf | 193 | mgmt, skb->len, &elems, |
d45c4172 | 194 | channel); |
d048e503 | 195 | if (bss) |
d48b2968 | 196 | ieee80211_rx_bss_put(local, bss); |
98c8fccf JB |
197 | } |
198 | ||
4d36ec58 JB |
199 | /* return false if no more work */ |
200 | static bool ieee80211_prep_hw_scan(struct ieee80211_local *local) | |
201 | { | |
202 | struct cfg80211_scan_request *req = local->scan_req; | |
203 | enum ieee80211_band band; | |
204 | int i, ielen, n_chans; | |
205 | ||
206 | do { | |
207 | if (local->hw_scan_band == IEEE80211_NUM_BANDS) | |
208 | return false; | |
209 | ||
210 | band = local->hw_scan_band; | |
211 | n_chans = 0; | |
212 | for (i = 0; i < req->n_channels; i++) { | |
213 | if (req->channels[i]->band == band) { | |
214 | local->hw_scan_req->channels[n_chans] = | |
215 | req->channels[i]; | |
216 | n_chans++; | |
217 | } | |
218 | } | |
219 | ||
220 | local->hw_scan_band++; | |
221 | } while (!n_chans); | |
222 | ||
223 | local->hw_scan_req->n_channels = n_chans; | |
224 | ||
225 | ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie, | |
c604b9f2 | 226 | local->hw_scan_ies_bufsize, |
8ee31080 | 227 | req->ie, req->ie_len, band, |
85a237fe | 228 | req->rates[band], 0); |
4d36ec58 | 229 | local->hw_scan_req->ie_len = ielen; |
dcd83976 | 230 | local->hw_scan_req->no_cck = req->no_cck; |
4d36ec58 JB |
231 | |
232 | return true; | |
233 | } | |
234 | ||
d07bfd8b | 235 | static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted, |
e229f844 | 236 | bool was_hw_scan) |
0a51b27e JB |
237 | { |
238 | struct ieee80211_local *local = hw_to_local(hw); | |
0a51b27e | 239 | |
e229f844 | 240 | lockdep_assert_held(&local->mtx); |
5bc75728 | 241 | |
6d3560d4 JB |
242 | /* |
243 | * It's ok to abort a not-yet-running scan (that | |
244 | * we have one at all will be verified by checking | |
245 | * local->scan_req next), but not to complete it | |
246 | * successfully. | |
247 | */ | |
248 | if (WARN_ON(!local->scanning && !aborted)) | |
249 | aborted = true; | |
5bc75728 | 250 | |
e229f844 | 251 | if (WARN_ON(!local->scan_req)) |
d07bfd8b | 252 | return; |
de95a54b | 253 | |
4d36ec58 | 254 | if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) { |
e2fd5dbc JB |
255 | int rc; |
256 | ||
257 | rc = drv_hw_scan(local, | |
258 | rcu_dereference_protected(local->scan_sdata, | |
259 | lockdep_is_held(&local->mtx)), | |
260 | local->hw_scan_req); | |
261 | ||
6eb11a9a | 262 | if (rc == 0) |
d07bfd8b | 263 | return; |
4d36ec58 JB |
264 | } |
265 | ||
266 | kfree(local->hw_scan_req); | |
267 | local->hw_scan_req = NULL; | |
f3b85252 | 268 | |
5ba63533 | 269 | if (local->scan_req != local->int_scan_req) |
2a519311 JB |
270 | cfg80211_scan_done(local->scan_req, aborted); |
271 | local->scan_req = NULL; | |
3aa569c3 | 272 | rcu_assign_pointer(local->scan_sdata, NULL); |
2a519311 | 273 | |
fbe9c429 | 274 | local->scanning = 0; |
58905ca5 | 275 | local->scan_channel = NULL; |
f3b85252 | 276 | |
07ef03ee JB |
277 | /* Set power back to normal operating levels. */ |
278 | ieee80211_hw_config(local, 0); | |
a0daa0e7 | 279 | |
e229f844 SG |
280 | if (!was_hw_scan) { |
281 | ieee80211_configure_filter(local); | |
282 | drv_sw_scan_complete(local); | |
aacde9ee | 283 | ieee80211_offchannel_return(local); |
e229f844 | 284 | } |
0a51b27e | 285 | |
5cff20e6 | 286 | ieee80211_recalc_idle(local); |
e229f844 | 287 | |
0a51b27e | 288 | ieee80211_mlme_notify_scan_completed(local); |
46900298 | 289 | ieee80211_ibss_notify_scan_completed(local); |
472dbc45 | 290 | ieee80211_mesh_notify_scan_completed(local); |
2eb278e0 | 291 | ieee80211_start_next_roc(local); |
0a51b27e | 292 | } |
8789d459 JB |
293 | |
294 | void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted) | |
295 | { | |
296 | struct ieee80211_local *local = hw_to_local(hw); | |
297 | ||
298 | trace_api_scan_completed(local, aborted); | |
299 | ||
300 | set_bit(SCAN_COMPLETED, &local->scanning); | |
301 | if (aborted) | |
302 | set_bit(SCAN_ABORTED, &local->scanning); | |
303 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0); | |
304 | } | |
0a51b27e JB |
305 | EXPORT_SYMBOL(ieee80211_scan_completed); |
306 | ||
f3b85252 JB |
307 | static int ieee80211_start_sw_scan(struct ieee80211_local *local) |
308 | { | |
fe57d9f5 JB |
309 | /* Software scan is not supported in multi-channel cases */ |
310 | if (local->use_chanctx) | |
311 | return -EOPNOTSUPP; | |
312 | ||
f3b85252 JB |
313 | /* |
314 | * Hardware/driver doesn't support hw_scan, so use software | |
315 | * scanning instead. First send a nullfunc frame with power save | |
316 | * bit on so that AP will buffer the frames for us while we are not | |
317 | * listening, then send probe requests to each channel and wait for | |
318 | * the responses. After all channels are scanned, tune back to the | |
319 | * original channel and send a nullfunc frame with power save bit | |
320 | * off to trigger the AP to send us all the buffered frames. | |
321 | * | |
322 | * Note that while local->sw_scanning is true everything else but | |
323 | * nullfunc frames and probe requests will be dropped in | |
324 | * ieee80211_tx_h_check_assoc(). | |
325 | */ | |
24487981 | 326 | drv_sw_scan_start(local); |
f3b85252 | 327 | |
de312db3 | 328 | local->leave_oper_channel_time = jiffies; |
977923b0 | 329 | local->next_scan_state = SCAN_DECISION; |
f3b85252 JB |
330 | local->scan_channel_idx = 0; |
331 | ||
aacde9ee | 332 | ieee80211_offchannel_stop_vifs(local); |
a80f7c0b | 333 | |
3ac64bee | 334 | ieee80211_configure_filter(local); |
f3b85252 | 335 | |
59bdf3b0 BG |
336 | /* We need to set power level at maximum rate for scanning. */ |
337 | ieee80211_hw_config(local, 0); | |
338 | ||
42935eca | 339 | ieee80211_queue_delayed_work(&local->hw, |
07ef03ee | 340 | &local->scan_work, 0); |
f3b85252 JB |
341 | |
342 | return 0; | |
343 | } | |
344 | ||
133d40f9 SG |
345 | static bool ieee80211_can_scan(struct ieee80211_local *local, |
346 | struct ieee80211_sub_if_data *sdata) | |
347 | { | |
2eb278e0 | 348 | if (!list_empty(&local->roc_list)) |
133d40f9 SG |
349 | return false; |
350 | ||
351 | if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
352 | sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL | | |
353 | IEEE80211_STA_CONNECTION_POLL)) | |
354 | return false; | |
355 | ||
356 | return true; | |
357 | } | |
358 | ||
359 | void ieee80211_run_deferred_scan(struct ieee80211_local *local) | |
360 | { | |
361 | lockdep_assert_held(&local->mtx); | |
362 | ||
363 | if (!local->scan_req || local->scanning) | |
364 | return; | |
365 | ||
e2fd5dbc JB |
366 | if (!ieee80211_can_scan(local, |
367 | rcu_dereference_protected( | |
368 | local->scan_sdata, | |
369 | lockdep_is_held(&local->mtx)))) | |
133d40f9 SG |
370 | return; |
371 | ||
372 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
373 | round_jiffies_relative(0)); | |
374 | } | |
f3b85252 | 375 | |
8a690674 BG |
376 | static void ieee80211_scan_state_send_probe(struct ieee80211_local *local, |
377 | unsigned long *next_delay) | |
378 | { | |
379 | int i; | |
e2fd5dbc | 380 | struct ieee80211_sub_if_data *sdata; |
8a690674 BG |
381 | enum ieee80211_band band = local->hw.conf.channel->band; |
382 | ||
e2fd5dbc | 383 | sdata = rcu_dereference_protected(local->scan_sdata, |
316b6b5d | 384 | lockdep_is_held(&local->mtx)); |
e2fd5dbc | 385 | |
8a690674 BG |
386 | for (i = 0; i < local->scan_req->n_ssids; i++) |
387 | ieee80211_send_probe_req( | |
388 | sdata, NULL, | |
389 | local->scan_req->ssids[i].ssid, | |
390 | local->scan_req->ssids[i].ssid_len, | |
391 | local->scan_req->ie, local->scan_req->ie_len, | |
392 | local->scan_req->rates[band], false, | |
1672c0e3 JB |
393 | local->scan_req->no_cck ? |
394 | IEEE80211_TX_CTL_NO_CCK_RATE : 0, | |
55de908a | 395 | local->hw.conf.channel, true); |
8a690674 BG |
396 | |
397 | /* | |
398 | * After sending probe requests, wait for probe responses | |
399 | * on the channel. | |
400 | */ | |
401 | *next_delay = IEEE80211_CHANNEL_TIME; | |
402 | local->next_scan_state = SCAN_DECISION; | |
403 | } | |
404 | ||
f3b85252 JB |
405 | static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, |
406 | struct cfg80211_scan_request *req) | |
407 | { | |
408 | struct ieee80211_local *local = sdata->local; | |
f3b85252 JB |
409 | int rc; |
410 | ||
e229f844 SG |
411 | lockdep_assert_held(&local->mtx); |
412 | ||
f3b85252 JB |
413 | if (local->scan_req) |
414 | return -EBUSY; | |
415 | ||
133d40f9 | 416 | if (!ieee80211_can_scan(local, sdata)) { |
6e7e6213 | 417 | /* wait for the work to finish/time out */ |
c0ce77b8 | 418 | local->scan_req = req; |
e2fd5dbc | 419 | rcu_assign_pointer(local->scan_sdata, sdata); |
c0ce77b8 JB |
420 | return 0; |
421 | } | |
422 | ||
f3b85252 JB |
423 | if (local->ops->hw_scan) { |
424 | u8 *ies; | |
f3b85252 | 425 | |
c604b9f2 JB |
426 | local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN + |
427 | local->scan_ies_len + | |
428 | req->ie_len; | |
4d36ec58 JB |
429 | local->hw_scan_req = kmalloc( |
430 | sizeof(*local->hw_scan_req) + | |
431 | req->n_channels * sizeof(req->channels[0]) + | |
c604b9f2 | 432 | local->hw_scan_ies_bufsize, GFP_KERNEL); |
4d36ec58 | 433 | if (!local->hw_scan_req) |
f3b85252 JB |
434 | return -ENOMEM; |
435 | ||
4d36ec58 JB |
436 | local->hw_scan_req->ssids = req->ssids; |
437 | local->hw_scan_req->n_ssids = req->n_ssids; | |
438 | ies = (u8 *)local->hw_scan_req + | |
439 | sizeof(*local->hw_scan_req) + | |
440 | req->n_channels * sizeof(req->channels[0]); | |
441 | local->hw_scan_req->ie = ies; | |
cd2bb512 | 442 | local->hw_scan_req->flags = req->flags; |
4d36ec58 JB |
443 | |
444 | local->hw_scan_band = 0; | |
6e7e6213 JL |
445 | |
446 | /* | |
447 | * After allocating local->hw_scan_req, we must | |
448 | * go through until ieee80211_prep_hw_scan(), so | |
449 | * anything that might be changed here and leave | |
450 | * this function early must not go after this | |
451 | * allocation. | |
452 | */ | |
f3b85252 JB |
453 | } |
454 | ||
455 | local->scan_req = req; | |
e2fd5dbc | 456 | rcu_assign_pointer(local->scan_sdata, sdata); |
f3b85252 | 457 | |
8a690674 | 458 | if (local->ops->hw_scan) { |
fbe9c429 | 459 | __set_bit(SCAN_HW_SCANNING, &local->scanning); |
8a690674 | 460 | } else if ((req->n_channels == 1) && |
55de908a | 461 | (req->channels[0] == local->_oper_channel)) { |
9b864870 JB |
462 | /* |
463 | * If we are scanning only on the operating channel | |
464 | * then we do not need to stop normal activities | |
8a690674 BG |
465 | */ |
466 | unsigned long next_delay; | |
467 | ||
468 | __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning); | |
469 | ||
470 | ieee80211_recalc_idle(local); | |
471 | ||
472 | /* Notify driver scan is starting, keep order of operations | |
473 | * same as normal software scan, in case that matters. */ | |
474 | drv_sw_scan_start(local); | |
475 | ||
476 | ieee80211_configure_filter(local); /* accept probe-responses */ | |
477 | ||
478 | /* We need to ensure power level is at max for scanning. */ | |
479 | ieee80211_hw_config(local, 0); | |
480 | ||
481 | if ((req->channels[0]->flags & | |
482 | IEEE80211_CHAN_PASSIVE_SCAN) || | |
483 | !local->scan_req->n_ssids) { | |
484 | next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
485 | } else { | |
486 | ieee80211_scan_state_send_probe(local, &next_delay); | |
487 | next_delay = IEEE80211_CHANNEL_TIME; | |
488 | } | |
489 | ||
490 | /* Now, just wait a bit and we are all done! */ | |
491 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, | |
492 | next_delay); | |
493 | return 0; | |
494 | } else { | |
495 | /* Do normal software scan */ | |
fbe9c429 | 496 | __set_bit(SCAN_SW_SCANNING, &local->scanning); |
8a690674 | 497 | } |
6e7e6213 | 498 | |
5cff20e6 | 499 | ieee80211_recalc_idle(local); |
f3b85252 | 500 | |
4d36ec58 JB |
501 | if (local->ops->hw_scan) { |
502 | WARN_ON(!ieee80211_prep_hw_scan(local)); | |
a060bbfe | 503 | rc = drv_hw_scan(local, sdata, local->hw_scan_req); |
4d36ec58 | 504 | } else |
f3b85252 JB |
505 | rc = ieee80211_start_sw_scan(local); |
506 | ||
f3b85252 | 507 | if (rc) { |
4d36ec58 JB |
508 | kfree(local->hw_scan_req); |
509 | local->hw_scan_req = NULL; | |
fbe9c429 | 510 | local->scanning = 0; |
f3b85252 | 511 | |
5cff20e6 JB |
512 | ieee80211_recalc_idle(local); |
513 | ||
f3b85252 | 514 | local->scan_req = NULL; |
e2fd5dbc | 515 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
516 | } |
517 | ||
518 | return rc; | |
519 | } | |
520 | ||
df13cce5 HS |
521 | static unsigned long |
522 | ieee80211_scan_get_channel_time(struct ieee80211_channel *chan) | |
523 | { | |
524 | /* | |
525 | * TODO: channel switching also consumes quite some time, | |
526 | * add that delay as well to get a better estimation | |
527 | */ | |
528 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN) | |
529 | return IEEE80211_PASSIVE_CHANNEL_TIME; | |
530 | return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME; | |
531 | } | |
532 | ||
e229f844 SG |
533 | static void ieee80211_scan_state_decision(struct ieee80211_local *local, |
534 | unsigned long *next_delay) | |
7d3be3cc | 535 | { |
142b9f50 | 536 | bool associated = false; |
df13cce5 HS |
537 | bool tx_empty = true; |
538 | bool bad_latency; | |
142b9f50 | 539 | struct ieee80211_sub_if_data *sdata; |
df13cce5 | 540 | struct ieee80211_channel *next_chan; |
cd2bb512 | 541 | enum mac80211_scan_state next_scan_state; |
142b9f50 | 542 | |
df13cce5 HS |
543 | /* |
544 | * check if at least one STA interface is associated, | |
545 | * check if at least one STA interface has pending tx frames | |
546 | * and grab the lowest used beacon interval | |
547 | */ | |
142b9f50 HS |
548 | mutex_lock(&local->iflist_mtx); |
549 | list_for_each_entry(sdata, &local->interfaces, list) { | |
9607e6b6 | 550 | if (!ieee80211_sdata_running(sdata)) |
142b9f50 HS |
551 | continue; |
552 | ||
553 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { | |
554 | if (sdata->u.mgd.associated) { | |
555 | associated = true; | |
df13cce5 | 556 | |
df13cce5 HS |
557 | if (!qdisc_all_tx_empty(sdata->dev)) { |
558 | tx_empty = false; | |
559 | break; | |
560 | } | |
142b9f50 HS |
561 | } |
562 | } | |
563 | } | |
564 | mutex_unlock(&local->iflist_mtx); | |
565 | ||
b23b025f BG |
566 | next_chan = local->scan_req->channels[local->scan_channel_idx]; |
567 | ||
a80f7c0b | 568 | /* |
07ef03ee JB |
569 | * we're currently scanning a different channel, let's |
570 | * see if we can scan another channel without interfering | |
571 | * with the current traffic situation. | |
572 | * | |
3f892b61 | 573 | * Keep good latency, do not stay off-channel more than 125 ms. |
a80f7c0b | 574 | */ |
a80f7c0b | 575 | |
07ef03ee | 576 | bad_latency = time_after(jiffies + |
3f892b61 SG |
577 | ieee80211_scan_get_channel_time(next_chan), |
578 | local->leave_oper_channel_time + HZ / 8); | |
142b9f50 | 579 | |
cd2bb512 SL |
580 | if (associated && !tx_empty) { |
581 | if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY) | |
582 | next_scan_state = SCAN_ABORT; | |
583 | else | |
584 | next_scan_state = SCAN_SUSPEND; | |
3f892b61 | 585 | } else if (associated && bad_latency) { |
cd2bb512 SL |
586 | next_scan_state = SCAN_SUSPEND; |
587 | } else { | |
588 | next_scan_state = SCAN_SET_CHANNEL; | |
589 | } | |
590 | ||
591 | local->next_scan_state = next_scan_state; | |
142b9f50 | 592 | |
07ef03ee | 593 | *next_delay = 0; |
142b9f50 HS |
594 | } |
595 | ||
2fb3f028 HS |
596 | static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, |
597 | unsigned long *next_delay) | |
598 | { | |
599 | int skip; | |
600 | struct ieee80211_channel *chan; | |
2fb3f028 | 601 | |
7d3be3cc HS |
602 | skip = 0; |
603 | chan = local->scan_req->channels[local->scan_channel_idx]; | |
604 | ||
584991dc | 605 | local->scan_channel = chan; |
b23b025f | 606 | |
07ef03ee JB |
607 | if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) |
608 | skip = 1; | |
7d3be3cc | 609 | |
7d3be3cc HS |
610 | /* advance state machine to next channel/band */ |
611 | local->scan_channel_idx++; | |
612 | ||
0ee9c13c HS |
613 | if (skip) { |
614 | /* if we skip this channel return to the decision state */ | |
615 | local->next_scan_state = SCAN_DECISION; | |
2fb3f028 | 616 | return; |
0ee9c13c | 617 | } |
7d3be3cc HS |
618 | |
619 | /* | |
620 | * Probe delay is used to update the NAV, cf. 11.1.3.2.2 | |
621 | * (which unfortunately doesn't say _why_ step a) is done, | |
622 | * but it waits for the probe delay or until a frame is | |
623 | * received - and the received frame would update the NAV). | |
624 | * For now, we do not support waiting until a frame is | |
625 | * received. | |
626 | * | |
627 | * In any case, it is not necessary for a passive scan. | |
628 | */ | |
629 | if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN || | |
630 | !local->scan_req->n_ssids) { | |
631 | *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME; | |
977923b0 | 632 | local->next_scan_state = SCAN_DECISION; |
2fb3f028 | 633 | return; |
7d3be3cc HS |
634 | } |
635 | ||
2fb3f028 | 636 | /* active scan, send probes */ |
7d3be3cc | 637 | *next_delay = IEEE80211_PROBE_DELAY; |
977923b0 | 638 | local->next_scan_state = SCAN_SEND_PROBE; |
7d3be3cc HS |
639 | } |
640 | ||
07ef03ee JB |
641 | static void ieee80211_scan_state_suspend(struct ieee80211_local *local, |
642 | unsigned long *next_delay) | |
643 | { | |
644 | /* switch back to the operating channel */ | |
645 | local->scan_channel = NULL; | |
646 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); | |
647 | ||
aacde9ee SG |
648 | /* disable PS */ |
649 | ieee80211_offchannel_return(local); | |
07ef03ee JB |
650 | |
651 | *next_delay = HZ / 5; | |
652 | /* afterwards, resume scan & go to next channel */ | |
653 | local->next_scan_state = SCAN_RESUME; | |
654 | } | |
655 | ||
656 | static void ieee80211_scan_state_resume(struct ieee80211_local *local, | |
657 | unsigned long *next_delay) | |
658 | { | |
aacde9ee | 659 | ieee80211_offchannel_stop_vifs(local); |
07ef03ee JB |
660 | |
661 | if (local->ops->flush) { | |
662 | drv_flush(local, false); | |
663 | *next_delay = 0; | |
664 | } else | |
665 | *next_delay = HZ / 10; | |
666 | ||
667 | /* remember when we left the operating channel */ | |
668 | local->leave_oper_channel_time = jiffies; | |
669 | ||
670 | /* advance to the next channel to be scanned */ | |
de2ee84d | 671 | local->next_scan_state = SCAN_SET_CHANNEL; |
07ef03ee JB |
672 | } |
673 | ||
c2b13452 | 674 | void ieee80211_scan_work(struct work_struct *work) |
0a51b27e JB |
675 | { |
676 | struct ieee80211_local *local = | |
677 | container_of(work, struct ieee80211_local, scan_work.work); | |
d07bfd8b | 678 | struct ieee80211_sub_if_data *sdata; |
0a51b27e | 679 | unsigned long next_delay = 0; |
d07bfd8b | 680 | bool aborted, hw_scan; |
0a51b27e | 681 | |
259b62e3 | 682 | mutex_lock(&local->mtx); |
8789d459 | 683 | |
e2fd5dbc JB |
684 | sdata = rcu_dereference_protected(local->scan_sdata, |
685 | lockdep_is_held(&local->mtx)); | |
d07bfd8b | 686 | |
8a690674 BG |
687 | /* When scanning on-channel, the first-callback means completed. */ |
688 | if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) { | |
689 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); | |
690 | goto out_complete; | |
691 | } | |
692 | ||
259b62e3 | 693 | if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) { |
8789d459 | 694 | aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning); |
259b62e3 | 695 | goto out_complete; |
8789d459 JB |
696 | } |
697 | ||
259b62e3 SG |
698 | if (!sdata || !local->scan_req) |
699 | goto out; | |
f3b85252 | 700 | |
fbe9c429 | 701 | if (local->scan_req && !local->scanning) { |
f3b85252 JB |
702 | struct cfg80211_scan_request *req = local->scan_req; |
703 | int rc; | |
704 | ||
705 | local->scan_req = NULL; | |
e2fd5dbc | 706 | rcu_assign_pointer(local->scan_sdata, NULL); |
f3b85252 JB |
707 | |
708 | rc = __ieee80211_start_scan(sdata, req); | |
259b62e3 | 709 | if (rc) { |
3aed49ef SG |
710 | /* need to complete scan in cfg80211 */ |
711 | local->scan_req = req; | |
259b62e3 SG |
712 | aborted = true; |
713 | goto out_complete; | |
714 | } else | |
715 | goto out; | |
f3b85252 JB |
716 | } |
717 | ||
5bc75728 JB |
718 | /* |
719 | * Avoid re-scheduling when the sdata is going away. | |
720 | */ | |
9607e6b6 | 721 | if (!ieee80211_sdata_running(sdata)) { |
259b62e3 SG |
722 | aborted = true; |
723 | goto out_complete; | |
f3b85252 | 724 | } |
0a51b27e | 725 | |
f502d09b HS |
726 | /* |
727 | * as long as no delay is required advance immediately | |
728 | * without scheduling a new work | |
729 | */ | |
730 | do { | |
c29acf20 RM |
731 | if (!ieee80211_sdata_running(sdata)) { |
732 | aborted = true; | |
733 | goto out_complete; | |
734 | } | |
735 | ||
977923b0 | 736 | switch (local->next_scan_state) { |
2fb3f028 | 737 | case SCAN_DECISION: |
e229f844 SG |
738 | /* if no more bands/channels left, complete scan */ |
739 | if (local->scan_channel_idx >= local->scan_req->n_channels) { | |
740 | aborted = false; | |
741 | goto out_complete; | |
742 | } | |
743 | ieee80211_scan_state_decision(local, &next_delay); | |
f502d09b | 744 | break; |
2fb3f028 HS |
745 | case SCAN_SET_CHANNEL: |
746 | ieee80211_scan_state_set_channel(local, &next_delay); | |
747 | break; | |
f502d09b HS |
748 | case SCAN_SEND_PROBE: |
749 | ieee80211_scan_state_send_probe(local, &next_delay); | |
750 | break; | |
07ef03ee JB |
751 | case SCAN_SUSPEND: |
752 | ieee80211_scan_state_suspend(local, &next_delay); | |
142b9f50 | 753 | break; |
07ef03ee JB |
754 | case SCAN_RESUME: |
755 | ieee80211_scan_state_resume(local, &next_delay); | |
142b9f50 | 756 | break; |
cd2bb512 SL |
757 | case SCAN_ABORT: |
758 | aborted = true; | |
759 | goto out_complete; | |
f502d09b HS |
760 | } |
761 | } while (next_delay == 0); | |
0a51b27e | 762 | |
42935eca | 763 | ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay); |
d07bfd8b | 764 | goto out; |
259b62e3 SG |
765 | |
766 | out_complete: | |
e229f844 | 767 | hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning); |
d07bfd8b | 768 | __ieee80211_scan_completed(&local->hw, aborted, hw_scan); |
259b62e3 SG |
769 | out: |
770 | mutex_unlock(&local->mtx); | |
0a51b27e JB |
771 | } |
772 | ||
f3b85252 JB |
773 | int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata, |
774 | struct cfg80211_scan_request *req) | |
0a51b27e | 775 | { |
f3b85252 | 776 | int res; |
de95a54b | 777 | |
a1699b75 | 778 | mutex_lock(&sdata->local->mtx); |
f3b85252 | 779 | res = __ieee80211_start_scan(sdata, req); |
a1699b75 | 780 | mutex_unlock(&sdata->local->mtx); |
0a51b27e | 781 | |
f3b85252 | 782 | return res; |
0a51b27e JB |
783 | } |
784 | ||
34bcf715 SG |
785 | int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata, |
786 | const u8 *ssid, u8 ssid_len, | |
787 | struct ieee80211_channel *chan) | |
0a51b27e | 788 | { |
0a51b27e | 789 | struct ieee80211_local *local = sdata->local; |
f3b85252 | 790 | int ret = -EBUSY; |
fb63bc41 | 791 | enum ieee80211_band band; |
2a519311 | 792 | |
a1699b75 | 793 | mutex_lock(&local->mtx); |
0a51b27e | 794 | |
f3b85252 JB |
795 | /* busy scanning */ |
796 | if (local->scan_req) | |
797 | goto unlock; | |
9116dd01 | 798 | |
be4a4b6a JB |
799 | /* fill internal scan request */ |
800 | if (!chan) { | |
34bcf715 SG |
801 | int i, max_n; |
802 | int n_ch = 0; | |
be4a4b6a JB |
803 | |
804 | for (band = 0; band < IEEE80211_NUM_BANDS; band++) { | |
805 | if (!local->hw.wiphy->bands[band]) | |
806 | continue; | |
34bcf715 SG |
807 | |
808 | max_n = local->hw.wiphy->bands[band]->n_channels; | |
809 | for (i = 0; i < max_n; i++) { | |
810 | struct ieee80211_channel *tmp_ch = | |
be4a4b6a | 811 | &local->hw.wiphy->bands[band]->channels[i]; |
34bcf715 SG |
812 | |
813 | if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS | | |
814 | IEEE80211_CHAN_DISABLED)) | |
815 | continue; | |
816 | ||
817 | local->int_scan_req->channels[n_ch] = tmp_ch; | |
818 | n_ch++; | |
be4a4b6a JB |
819 | } |
820 | } | |
821 | ||
34bcf715 SG |
822 | if (WARN_ON_ONCE(n_ch == 0)) |
823 | goto unlock; | |
824 | ||
825 | local->int_scan_req->n_channels = n_ch; | |
be4a4b6a | 826 | } else { |
34bcf715 SG |
827 | if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS | |
828 | IEEE80211_CHAN_DISABLED))) | |
829 | goto unlock; | |
830 | ||
be4a4b6a JB |
831 | local->int_scan_req->channels[0] = chan; |
832 | local->int_scan_req->n_channels = 1; | |
833 | } | |
834 | ||
835 | local->int_scan_req->ssids = &local->scan_ssid; | |
836 | local->int_scan_req->n_ssids = 1; | |
5ba63533 JB |
837 | memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN); |
838 | local->int_scan_req->ssids[0].ssid_len = ssid_len; | |
9116dd01 | 839 | |
5ba63533 | 840 | ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req); |
f3b85252 | 841 | unlock: |
a1699b75 | 842 | mutex_unlock(&local->mtx); |
f3b85252 | 843 | return ret; |
0a51b27e | 844 | } |
5bb644a0 | 845 | |
4136c422 SG |
846 | /* |
847 | * Only call this function when a scan can't be queued -- under RTNL. | |
848 | */ | |
5bb644a0 JB |
849 | void ieee80211_scan_cancel(struct ieee80211_local *local) |
850 | { | |
5bb644a0 | 851 | /* |
b856439b | 852 | * We are canceling software scan, or deferred scan that was not |
4136c422 SG |
853 | * yet really started (see __ieee80211_start_scan ). |
854 | * | |
855 | * Regarding hardware scan: | |
856 | * - we can not call __ieee80211_scan_completed() as when | |
857 | * SCAN_HW_SCANNING bit is set this function change | |
858 | * local->hw_scan_req to operate on 5G band, what race with | |
859 | * driver which can use local->hw_scan_req | |
860 | * | |
861 | * - we can not cancel scan_work since driver can schedule it | |
862 | * by ieee80211_scan_completed(..., true) to finish scan | |
863 | * | |
b856439b EP |
864 | * Hence we only call the cancel_hw_scan() callback, but the low-level |
865 | * driver is still responsible for calling ieee80211_scan_completed() | |
866 | * after the scan was completed/aborted. | |
5bb644a0 | 867 | */ |
4136c422 | 868 | |
a1699b75 | 869 | mutex_lock(&local->mtx); |
b856439b EP |
870 | if (!local->scan_req) |
871 | goto out; | |
872 | ||
873 | if (test_bit(SCAN_HW_SCANNING, &local->scanning)) { | |
874 | if (local->ops->cancel_hw_scan) | |
e2fd5dbc JB |
875 | drv_cancel_hw_scan(local, |
876 | rcu_dereference_protected(local->scan_sdata, | |
877 | lockdep_is_held(&local->mtx))); | |
b856439b | 878 | goto out; |
4136c422 | 879 | } |
b856439b EP |
880 | |
881 | /* | |
882 | * If the work is currently running, it must be blocked on | |
883 | * the mutex, but we'll set scan_sdata = NULL and it'll | |
884 | * simply exit once it acquires the mutex. | |
885 | */ | |
886 | cancel_delayed_work(&local->scan_work); | |
887 | /* and clean up */ | |
888 | __ieee80211_scan_completed(&local->hw, true, false); | |
889 | out: | |
d07bfd8b | 890 | mutex_unlock(&local->mtx); |
5bb644a0 | 891 | } |
79f460ca LC |
892 | |
893 | int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata, | |
894 | struct cfg80211_sched_scan_request *req) | |
895 | { | |
896 | struct ieee80211_local *local = sdata->local; | |
bca1e29f | 897 | struct ieee80211_sched_scan_ies sched_scan_ies = {}; |
c604b9f2 JB |
898 | int ret, i, iebufsz; |
899 | ||
900 | iebufsz = 2 + IEEE80211_MAX_SSID_LEN + | |
901 | local->scan_ies_len + req->ie_len; | |
79f460ca | 902 | |
5260a5b2 | 903 | mutex_lock(&local->mtx); |
79f460ca | 904 | |
5260a5b2 | 905 | if (rcu_access_pointer(local->sched_scan_sdata)) { |
79f460ca LC |
906 | ret = -EBUSY; |
907 | goto out; | |
908 | } | |
909 | ||
910 | if (!local->ops->sched_scan_start) { | |
911 | ret = -ENOTSUPP; | |
912 | goto out; | |
913 | } | |
914 | ||
915 | for (i = 0; i < IEEE80211_NUM_BANDS; i++) { | |
d811b3d5 AN |
916 | if (!local->hw.wiphy->bands[i]) |
917 | continue; | |
918 | ||
c604b9f2 | 919 | sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL); |
30dd3edf | 920 | if (!sched_scan_ies.ie[i]) { |
79f460ca LC |
921 | ret = -ENOMEM; |
922 | goto out_free; | |
923 | } | |
924 | ||
30dd3edf JB |
925 | sched_scan_ies.len[i] = |
926 | ieee80211_build_preq_ies(local, sched_scan_ies.ie[i], | |
c604b9f2 JB |
927 | iebufsz, req->ie, req->ie_len, |
928 | i, (u32) -1, 0); | |
79f460ca LC |
929 | } |
930 | ||
30dd3edf JB |
931 | ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies); |
932 | if (ret == 0) | |
5260a5b2 | 933 | rcu_assign_pointer(local->sched_scan_sdata, sdata); |
79f460ca LC |
934 | |
935 | out_free: | |
936 | while (i > 0) | |
30dd3edf | 937 | kfree(sched_scan_ies.ie[--i]); |
79f460ca | 938 | out: |
5260a5b2 | 939 | mutex_unlock(&local->mtx); |
79f460ca LC |
940 | return ret; |
941 | } | |
942 | ||
85a9994a | 943 | int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata) |
79f460ca LC |
944 | { |
945 | struct ieee80211_local *local = sdata->local; | |
30dd3edf | 946 | int ret = 0; |
79f460ca | 947 | |
5260a5b2 | 948 | mutex_lock(&local->mtx); |
79f460ca LC |
949 | |
950 | if (!local->ops->sched_scan_stop) { | |
951 | ret = -ENOTSUPP; | |
952 | goto out; | |
953 | } | |
954 | ||
30dd3edf | 955 | if (rcu_access_pointer(local->sched_scan_sdata)) |
85a9994a | 956 | drv_sched_scan_stop(local, sdata); |
30dd3edf | 957 | |
79f460ca | 958 | out: |
5260a5b2 | 959 | mutex_unlock(&local->mtx); |
79f460ca LC |
960 | |
961 | return ret; | |
962 | } | |
963 | ||
964 | void ieee80211_sched_scan_results(struct ieee80211_hw *hw) | |
965 | { | |
966 | struct ieee80211_local *local = hw_to_local(hw); | |
967 | ||
968 | trace_api_sched_scan_results(local); | |
969 | ||
970 | cfg80211_sched_scan_results(hw->wiphy); | |
971 | } | |
972 | EXPORT_SYMBOL(ieee80211_sched_scan_results); | |
973 | ||
85a9994a LC |
974 | void ieee80211_sched_scan_stopped_work(struct work_struct *work) |
975 | { | |
976 | struct ieee80211_local *local = | |
977 | container_of(work, struct ieee80211_local, | |
978 | sched_scan_stopped_work); | |
85a9994a LC |
979 | |
980 | mutex_lock(&local->mtx); | |
981 | ||
5260a5b2 | 982 | if (!rcu_access_pointer(local->sched_scan_sdata)) { |
85a9994a LC |
983 | mutex_unlock(&local->mtx); |
984 | return; | |
985 | } | |
986 | ||
5260a5b2 | 987 | rcu_assign_pointer(local->sched_scan_sdata, NULL); |
85a9994a LC |
988 | |
989 | mutex_unlock(&local->mtx); | |
990 | ||
991 | cfg80211_sched_scan_stopped(local->hw.wiphy); | |
992 | } | |
993 | ||
79f460ca LC |
994 | void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw) |
995 | { | |
996 | struct ieee80211_local *local = hw_to_local(hw); | |
997 | ||
998 | trace_api_sched_scan_stopped(local); | |
999 | ||
85a9994a | 1000 | ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work); |
79f460ca LC |
1001 | } |
1002 | EXPORT_SYMBOL(ieee80211_sched_scan_stopped); |