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 /* return value indicates whether the driver should be further notified */
  10 static bool ieee80211_quiesce(struct ieee80211_sub_if_data *sdata)
  11 {
  12         switch (sdata->vif.type) {
  13         case NL80211_IFTYPE_STATION:
  14                 ieee80211_sta_quiesce(sdata);
  15                 return true;
  16         case NL80211_IFTYPE_ADHOC:
  17                 ieee80211_ibss_quiesce(sdata);
  18                 return true;
  19         case NL80211_IFTYPE_MESH_POINT:
  20                 ieee80211_mesh_quiesce(sdata);
  21                 return true;
  22         case NL80211_IFTYPE_AP_VLAN:
  23         case NL80211_IFTYPE_MONITOR:
  24                 /* don't tell driver about this */
  25                 return false;
  26         default:
  27                 return true;
  28         }
  29 }
  30
  31 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
  32 {
  33         struct ieee80211_local *local = hw_to_local(hw);
  34         struct ieee80211_sub_if_data *sdata;
  35         struct sta_info *sta;
  36
  37         if (!local->open_count)
  38                 goto suspend;
  39
  40         ieee80211_scan_cancel(local);
  41
  42         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  43                 mutex_lock(&local->sta_mtx);
  44                 list_for_each_entry(sta, &local->sta_list, list) {
  45                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  46                         ieee80211_sta_tear_down_BA_sessions(sta, true);
  47                 }
  48                 mutex_unlock(&local->sta_mtx);
  49         }
  50
  51         ieee80211_stop_queues_by_reason(hw,
  52                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  53
  54         /* flush out all packets */
  55         synchronize_net();
  56
  57         drv_flush(local, false);
  58
  59         local->quiescing = true;
  60         /* make quiescing visible to timers everywhere */
  61         mb();
  62
  63         flush_workqueue(local->workqueue);
  64
  65         /* Don't try to run timers while suspended. */
  66         del_timer_sync(&local->sta_cleanup);
  67
  68          /*
  69          * Note that this particular timer doesn't need to be
  70          * restarted at resume.
  71          */
  72         cancel_work_sync(&local->dynamic_ps_enable_work);
  73         del_timer_sync(&local->dynamic_ps_timer);
  74
  75         local->wowlan = wowlan && local->open_count;
  76         if (local->wowlan) {
  77                 int err = drv_suspend(local, wowlan);
  78                 if (err < 0) {
  79                         local->quiescing = false;
  80                         local->wowlan = false;
  81                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  82                                 mutex_lock(&local->sta_mtx);
  83                                 list_for_each_entry(sta,
  84                                                     &local->sta_list, list) {
  85                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  86                                 }
  87                                 mutex_unlock(&local->sta_mtx);
  88                         }
  89                         ieee80211_wake_queues_by_reason(hw,
  90                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  91                         return err;
  92                 } else if (err > 0) {
  93                         WARN_ON(err != 1);
  94                         local->wowlan = false;
  95                 } else {
  96                         list_for_each_entry(sdata, &local->interfaces, list) {
  97                                 cancel_work_sync(&sdata->work);
  98                                 ieee80211_quiesce(sdata);
  99                         }
 100                         goto suspend;
 101                 }
 102         }
 103
 104         /* disable keys */
 105         list_for_each_entry(sdata, &local->interfaces, list)
 106                 ieee80211_disable_keys(sdata);
 107
 108         /* tear down aggregation sessions and remove STAs */
 109         mutex_lock(&local->sta_mtx);
 110         list_for_each_entry(sta, &local->sta_list, list) {
 111                 if (sta->uploaded) {
 112                         enum ieee80211_sta_state state;
 113
 114                         state = sta->sta_state;
 115                         for (; state > IEEE80211_STA_NOTEXIST; state--)
 116                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
 117                                                       state, state - 1));
 118                 }
 119
 120                 mesh_plink_quiesce(sta);
 121         }
 122         mutex_unlock(&local->sta_mtx);
 123
 124         /* remove all interfaces */
 125         list_for_each_entry(sdata, &local->interfaces, list) {
 126                 cancel_work_sync(&sdata->work);
 127
 128                 if (!ieee80211_quiesce(sdata))
 129                         continue;
 130
 131                 if (!ieee80211_sdata_running(sdata))
 132                         continue;
 133
 134                 /* disable beaconing */
 135                 ieee80211_bss_info_change_notify(sdata,
 136                         BSS_CHANGED_BEACON_ENABLED);
 137
 138                 drv_remove_interface(local, sdata);
 139         }
 140
 141         sdata = rtnl_dereference(local->monitor_sdata);
 142         if (sdata)
 143                 drv_remove_interface(local, sdata);
 144
 145         /* stop hardware - this must stop RX */
 146         if (local->open_count)
 147                 ieee80211_stop_device(local);
 148
 149  suspend:
 150         local->suspended = true;
 151         /* need suspended to be visible before quiescing is false */
 152         barrier();
 153         local->quiescing = false;
 154
 155         return 0;
 156 }
 157
 158 /*
 159  * __ieee80211_resume() is a static inline which just calls
 160  * ieee80211_reconfig(), which is also needed for hardware
 161  * hang/firmware failure/etc. recovery.
 162  */