1 // SPDX-License-Identifier: GPL-2.0
2 #include <net/mac80211.h>
3 #include <net/rtnetlink.h>
4
5 #include "ieee80211_i.h"
6 #include "mesh.h"
7 #include "driver-ops.h"
8 #include "led.h"
9
10 static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
11 {
12 if (ieee80211_request_sched_scan_stop(local))
13 return;
14 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy, 0);
15 }
16
17 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
18 {
19 struct ieee80211_local *local = hw_to_local(hw);
20 struct ieee80211_sub_if_data *sdata;
21 struct sta_info *sta;
22
23 if (!local->open_count)
24 goto suspend;
25
26 ieee80211_scan_cancel(local);
27
28 ieee80211_dfs_cac_cancel(local);
29
30 ieee80211_roc_purge(local, NULL);
31
32 ieee80211_del_virtual_monitor(local);
33
34 if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
35 !(wowlan && wowlan->any)) {
36 mutex_lock(&local->sta_mtx);
37 list_for_each_entry(sta, &local->sta_list, list) {
38 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
39 ieee80211_sta_tear_down_BA_sessions(
40 sta, AGG_STOP_LOCAL_REQUEST);
41 }
42 mutex_unlock(&local->sta_mtx);
43 }
44
45 /* keep sched_scan only in case of 'any' trigger */
46 if (!(wowlan && wowlan->any))
47 ieee80211_sched_scan_cancel(local);
48
49 ieee80211_stop_queues_by_reason(hw,
50 IEEE80211_MAX_QUEUE_MAP,
51 IEEE80211_QUEUE_STOP_REASON_SUSPEND,
52 false);
53
54 /* flush out all packets */
55 synchronize_net();
56
57 ieee80211_flush_queues(local, NULL, true);
58
59 local->quiescing = true;
60 /* make quiescing visible to timers everywhere */
61 mb();
62
63 flush_workqueue(local->workqueue);
64
65 /* Don't try to run timers while suspended. */
66 del_timer_sync(&local->sta_cleanup);
67
68 /*
69 * Note that this particular timer doesn't need to be
70 * restarted at resume.
71 */
72 cancel_work_sync(&local->dynamic_ps_enable_work);
73 del_timer_sync(&local->dynamic_ps_timer);
74
75 local->wowlan = wowlan;
76 if (local->wowlan) {
77 int err;
78
79 /* Drivers don't expect to suspend while some operations like
80 * authenticating or associating are in progress. It doesn't
81 * make sense anyway to accept that, since the authentication
82 * or association would never finish since the driver can't do
83 * that on its own.
84 * Thus, clean up in-progress auth/assoc first.
85 */
86 list_for_each_entry(sdata, &local->interfaces, list) {
87 if (!ieee80211_sdata_running(sdata))
88 continue;
89 if (sdata->vif.type != NL80211_IFTYPE_STATION)
90 continue;
91 ieee80211_mgd_quiesce(sdata);
92 /* If suspended during TX in progress, and wowlan
93 * is enabled (connection will be active) there
94 * can be a race where the driver is put out
95 * of power-save due to TX and during suspend
96 * dynamic_ps_timer is cancelled and TX packet
97 * is flushed, leaving the driver in ACTIVE even
98 * after resuming until dynamic_ps_timer puts
99 * driver back in DOZE.
100 */
101 if (sdata->u.mgd.associated &&
102 sdata->u.mgd.powersave &&
103 !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
104 local->hw.conf.flags |= IEEE80211_CONF_PS;
105 ieee80211_hw_config(local,
106 IEEE80211_CONF_CHANGE_PS);
107 }
108 }
109
110 err = drv_suspend(local, wowlan);
111 if (err < 0) {
112 local->quiescing = false;
113 local->wowlan = false;
114 if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
115 mutex_lock(&local->sta_mtx);
116 list_for_each_entry(sta,
117 &local->sta_list, list) {
118 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
119 }
120 mutex_unlock(&local->sta_mtx);
121 }
122 ieee80211_wake_queues_by_reason(hw,
123 IEEE80211_MAX_QUEUE_MAP,
124 IEEE80211_QUEUE_STOP_REASON_SUSPEND,
125 false);
126 return err;
127 } else if (err > 0) {
128 WARN_ON(err != 1);
129 /* cfg80211 will call back into mac80211 to disconnect
130 * all interfaces, allow that to proceed properly
131 */
132 ieee80211_wake_queues_by_reason(hw,
133 IEEE80211_MAX_QUEUE_MAP,
134 IEEE80211_QUEUE_STOP_REASON_SUSPEND,
135 false);
136 return err;
137 } else {
138 goto suspend;
139 }
140 }
141
142 /* remove all interfaces that were created in the driver */
143 list_for_each_entry(sdata, &local->interfaces, list) {
144 if (!ieee80211_sdata_running(sdata))
145 continue;
146 switch (sdata->vif.type) {
147 case NL80211_IFTYPE_AP_VLAN:
148 case NL80211_IFTYPE_MONITOR:
149 continue;
150 case NL80211_IFTYPE_STATION:
151 ieee80211_mgd_quiesce(sdata);
152 break;
153 case NL80211_IFTYPE_WDS:
154 /* tear down aggregation sessions and remove STAs */
155 mutex_lock(&local->sta_mtx);
156 sta = sdata->u.wds.sta;
157 if (sta && sta->uploaded) {
158 enum ieee80211_sta_state state;
159
160 state = sta->sta_state;
161 for (; state > IEEE80211_STA_NOTEXIST; state--)
162 WARN_ON(drv_sta_state(local, sta->sdata,
163 sta, state,
164 state - 1));
165 }
166 mutex_unlock(&local->sta_mtx);
167 break;
168 default:
169 break;
170 }
171
172 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
173 drv_remove_interface(local, sdata);
174 }
175
176 /*
177 * We disconnected on all interfaces before suspend, all channel
178 * contexts should be released.
179 */
180 WARN_ON(!list_empty(&local->chanctx_list));
181
182 /* stop hardware - this must stop RX */
183 ieee80211_stop_device(local);
184
185 suspend:
186 local->suspended = true;
187 /* need suspended to be visible before quiescing is false */
188 barrier();
189 local->quiescing = false;
190
191 return 0;
192 }
193
194 /*
195 * __ieee80211_resume() is a static inline which just calls
196 * ieee80211_reconfig(), which is also needed for hardware
197 * hang/firmware failure/etc. recovery.
198 */
199
200 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
201 struct cfg80211_wowlan_wakeup *wakeup,
202 gfp_t gfp)
203 {
204 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
205
206 cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
207 }
208 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);