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