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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 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 10 {
 11         struct ieee80211_local *local = hw_to_local(hw);
 12         struct ieee80211_sub_if_data *sdata;
 13         struct sta_info *sta;
 14 
 15         ieee80211_scan_cancel(local);
 16 
 17         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
 18                 mutex_lock(&local->sta_mtx);
 19                 list_for_each_entry(sta, &local->sta_list, list) {
 20                         set_sta_flags(sta, WLAN_STA_BLOCK_BA);
 21                         ieee80211_sta_tear_down_BA_sessions(sta, true);
 22                 }
 23                 mutex_unlock(&local->sta_mtx);
 24         }
 25 
 26         ieee80211_stop_queues_by_reason(hw,
 27                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 28 
 29         /* flush out all packets */
 30         synchronize_net();
 31 
 32         drv_flush(local, false);
 33 
 34         local->quiescing = true;
 35         /* make quiescing visible to timers everywhere */
 36         mb();
 37 
 38         flush_workqueue(local->workqueue);
 39 
 40         /* Don't try to run timers while suspended. */
 41         del_timer_sync(&local->sta_cleanup);
 42 
 43          /*
 44          * Note that this particular timer doesn't need to be
 45          * restarted at resume.
 46          */
 47         cancel_work_sync(&local->dynamic_ps_enable_work);
 48         del_timer_sync(&local->dynamic_ps_timer);
 49 
 50         local->wowlan = wowlan && local->open_count;
 51         if (local->wowlan) {
 52                 int err = drv_suspend(local, wowlan);
 53                 if (err) {
 54                         local->quiescing = false;
 55                         return err;
 56                 }
 57                 goto suspend;
 58         }
 59 
 60         /* disable keys */
 61         list_for_each_entry(sdata, &local->interfaces, list)
 62                 ieee80211_disable_keys(sdata);
 63 
 64         /* tear down aggregation sessions and remove STAs */
 65         mutex_lock(&local->sta_mtx);
 66         list_for_each_entry(sta, &local->sta_list, list) {
 67                 if (sta->uploaded) {
 68                         sdata = sta->sdata;
 69                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 70                                 sdata = container_of(sdata->bss,
 71                                              struct ieee80211_sub_if_data,
 72                                              u.ap);
 73 
 74                         drv_sta_remove(local, sdata, &sta->sta);
 75                 }
 76 
 77                 mesh_plink_quiesce(sta);
 78         }
 79         mutex_unlock(&local->sta_mtx);
 80 
 81         /* remove all interfaces */
 82         list_for_each_entry(sdata, &local->interfaces, list) {
 83                 cancel_work_sync(&sdata->work);
 84 
 85                 switch(sdata->vif.type) {
 86                 case NL80211_IFTYPE_STATION:
 87                         ieee80211_sta_quiesce(sdata);
 88                         break;
 89                 case NL80211_IFTYPE_ADHOC:
 90                         ieee80211_ibss_quiesce(sdata);
 91                         break;
 92                 case NL80211_IFTYPE_MESH_POINT:
 93                         ieee80211_mesh_quiesce(sdata);
 94                         break;
 95                 case NL80211_IFTYPE_AP_VLAN:
 96                 case NL80211_IFTYPE_MONITOR:
 97                         /* don't tell driver about this */
 98                         continue;
 99                 default:
100                         break;
101                 }
102 
103                 if (!ieee80211_sdata_running(sdata))
104                         continue;
105 
106                 /* disable beaconing */
107                 ieee80211_bss_info_change_notify(sdata,
108                         BSS_CHANGED_BEACON_ENABLED);
109 
110                 drv_remove_interface(local, &sdata->vif);
111         }
112 
113         /* stop hardware - this must stop RX */
114         if (local->open_count)
115                 ieee80211_stop_device(local);
116 
117  suspend:
118         local->suspended = true;
119         /* need suspended to be visible before quiescing is false */
120         barrier();
121         local->quiescing = false;
122 
123         return 0;
124 }
125 
126 /*
127  * __ieee80211_resume() is a static inline which just calls
128  * ieee80211_reconfig(), which is also needed for hardware
129  * hang/firmware failure/etc. recovery.
130  */
131 

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