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