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

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

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