net/mac80211/pm.c

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