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TOMOYO Linux Cross Reference
Linux/net/mac80211/pm.c

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  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);
209 

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