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 */
  44
  45         rcu_read_lock();
  46
  47         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  48                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
  49                         set_sta_flags(sta, WLAN_STA_SUSPEND);
  50                         ieee80211_sta_tear_down_BA_sessions(sta);
  51                 }
  52         }
  53
  54         rcu_read_unlock();
  55
  56         /* remove STAs */
  57         mutex_lock(&local->sta_mtx);
  58         list_for_each_entry(sta, &local->sta_list, list) {
  59                 if (sta->uploaded) {
  60                         sdata = sta->sdata;
  61                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  62                                 sdata = container_of(sdata->bss,
  63                                              struct ieee80211_sub_if_data,
  64                                              u.ap);
  65
  66                         drv_sta_remove(local, sdata, &sta->sta);
  67                 }
  68
  69                 mesh_plink_quiesce(sta);
  70         }
  71         mutex_unlock(&local->sta_mtx);
  72
  73         /* remove all interfaces */
  74         list_for_each_entry(sdata, &local->interfaces, list) {
  75                 switch(sdata->vif.type) {
  76                 case NL80211_IFTYPE_STATION:
  77                         ieee80211_sta_quiesce(sdata);
  78                         break;
  79                 case NL80211_IFTYPE_ADHOC:
  80                         ieee80211_ibss_quiesce(sdata);
  81                         break;
  82                 case NL80211_IFTYPE_MESH_POINT:
  83                         ieee80211_mesh_quiesce(sdata);
  84                         break;
  85                 case NL80211_IFTYPE_AP_VLAN:
  86                 case NL80211_IFTYPE_MONITOR:
  87                         /* don't tell driver about this */
  88                         continue;
  89                 default:
  90                         break;
  91                 }
  92
  93                 if (!ieee80211_sdata_running(sdata))
  94                         continue;
  95
  96                 /* disable beaconing */
  97                 ieee80211_bss_info_change_notify(sdata,
  98                         BSS_CHANGED_BEACON_ENABLED);
  99
 100                 drv_remove_interface(local, &sdata->vif);
 101         }
 102
 103         /* stop hardware - this must stop RX */
 104         if (local->open_count)
 105                 ieee80211_stop_device(local);
 106
 107         local->suspended = true;
 108         /* need suspended to be visible before quiescing is false */
 109         barrier();
 110         local->quiescing = false;
 111
 112         return 0;
 113 }
 114
 115 /*
 116  * __ieee80211_resume() is a static inline which just calls
 117  * ieee80211_reconfig(), which is also needed for hardware
 118  * hang/firmware failure/etc. recovery.
 119  */