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         if (!local->open_count)
  16                 goto suspend;
  17
  18         ieee80211_scan_cancel(local);
  19
  20         ieee80211_dfs_cac_cancel(local);
  21
  22         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  23                 mutex_lock(&local->sta_mtx);
  24                 list_for_each_entry(sta, &local->sta_list, list) {
  25                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  26                         ieee80211_sta_tear_down_BA_sessions(
  27                                         sta, AGG_STOP_LOCAL_REQUEST);
  28                 }
  29                 mutex_unlock(&local->sta_mtx);
  30         }
  31
  32         ieee80211_stop_queues_by_reason(hw,
  33                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  34
  35         /* flush out all packets */
  36         synchronize_net();
  37
  38         drv_flush(local, false);
  39
  40         local->quiescing = true;
  41         /* make quiescing visible to timers everywhere */
  42         mb();
  43
  44         flush_workqueue(local->workqueue);
  45
  46         /* Don't try to run timers while suspended. */
  47         del_timer_sync(&local->sta_cleanup);
  48
  49          /*
  50          * Note that this particular timer doesn't need to be
  51          * restarted at resume.
  52          */
  53         cancel_work_sync(&local->dynamic_ps_enable_work);
  54         del_timer_sync(&local->dynamic_ps_timer);
  55
  56         local->wowlan = wowlan && local->open_count;
  57         if (local->wowlan) {
  58                 int err = drv_suspend(local, wowlan);
  59                 if (err < 0) {
  60                         local->quiescing = false;
  61                         local->wowlan = false;
  62                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  63                                 mutex_lock(&local->sta_mtx);
  64                                 list_for_each_entry(sta,
  65                                                     &local->sta_list, list) {
  66                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  67                                 }
  68                                 mutex_unlock(&local->sta_mtx);
  69                         }
  70                         ieee80211_wake_queues_by_reason(hw,
  71                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  72                         return err;
  73                 } else if (err > 0) {
  74                         WARN_ON(err != 1);
  75                         return err;
  76                 } else {
  77                         goto suspend;
  78                 }
  79         }
  80
  81         /* tear down aggregation sessions and remove STAs */
  82         mutex_lock(&local->sta_mtx);
  83         list_for_each_entry(sta, &local->sta_list, list) {
  84                 if (sta->uploaded) {
  85                         enum ieee80211_sta_state state;
  86
  87                         state = sta->sta_state;
  88                         for (; state > IEEE80211_STA_NOTEXIST; state--)
  89                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
  90                                                       state, state - 1));
  91                 }
  92         }
  93         mutex_unlock(&local->sta_mtx);
  94
  95         /* remove all interfaces */
  96         list_for_each_entry(sdata, &local->interfaces, list) {
  97                 if (!ieee80211_sdata_running(sdata))
  98                         continue;
  99                 drv_remove_interface(local, sdata);
 100         }
 101
 102         sdata = rtnl_dereference(local->monitor_sdata);
 103         if (sdata)
 104                 drv_remove_interface(local, sdata);
 105
 106         /*
 107          * We disconnected on all interfaces before suspend, all channel
 108          * contexts should be released.
 109          */
 110         WARN_ON(!list_empty(&local->chanctx_list));
 111
 112         /* stop hardware - this must stop RX */
 113         if (local->open_count)
 114                 ieee80211_stop_device(local);
 115
 116  suspend:
 117         local->suspended = true;
 118         /* need suspended to be visible before quiescing is false */
 119         barrier();
 120         local->quiescing = false;
 121
 122         return 0;
 123 }
 124
 125 /*
 126  * __ieee80211_resume() is a static inline which just calls
 127  * ieee80211_reconfig(), which is also needed for hardware
 128  * hang/firmware failure/etc. recovery.
 129  */
 130
 131 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 132                                     struct cfg80211_wowlan_wakeup *wakeup,
 133                                     gfp_t gfp)
 134 {
 135         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 136
 137         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 138 }
 139 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);