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, 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  */