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_MAX_QUEUE_MAP,
  34                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  35
  36         /* flush out all packets */
  37         synchronize_net();
  38
  39         ieee80211_flush_queues(local, NULL);
  40
  41         local->quiescing = true;
  42         /* make quiescing visible to timers everywhere */
  43         mb();
  44
  45         flush_workqueue(local->workqueue);
  46
  47         /* Don't try to run timers while suspended. */
  48         del_timer_sync(&local->sta_cleanup);
  49
  50          /*
  51          * Note that this particular timer doesn't need to be
  52          * restarted at resume.
  53          */
  54         cancel_work_sync(&local->dynamic_ps_enable_work);
  55         del_timer_sync(&local->dynamic_ps_timer);
  56
  57         local->wowlan = wowlan && local->open_count;
  58         if (local->wowlan) {
  59                 int err = drv_suspend(local, wowlan);
  60                 if (err < 0) {
  61                         local->quiescing = false;
  62                         local->wowlan = false;
  63                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  64                                 mutex_lock(&local->sta_mtx);
  65                                 list_for_each_entry(sta,
  66                                                     &local->sta_list, list) {
  67                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  68                                 }
  69                                 mutex_unlock(&local->sta_mtx);
  70                         }
  71                         ieee80211_wake_queues_by_reason(hw,
  72                                         IEEE80211_MAX_QUEUE_MAP,
  73                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  74                         return err;
  75                 } else if (err > 0) {
  76                         WARN_ON(err != 1);
  77                         return err;
  78                 } else {
  79                         goto suspend;
  80                 }
  81         }
  82
  83         /* tear down aggregation sessions and remove STAs */
  84         mutex_lock(&local->sta_mtx);
  85         list_for_each_entry(sta, &local->sta_list, list) {
  86                 if (sta->uploaded) {
  87                         enum ieee80211_sta_state state;
  88
  89                         state = sta->sta_state;
  90                         for (; state > IEEE80211_STA_NOTEXIST; state--)
  91                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
  92                                                       state, state - 1));
  93                 }
  94         }
  95         mutex_unlock(&local->sta_mtx);
  96
  97         /* remove all interfaces */
  98         list_for_each_entry(sdata, &local->interfaces, list) {
  99                 if (!ieee80211_sdata_running(sdata))
 100                         continue;
 101                 drv_remove_interface(local, sdata);
 102         }
 103
 104         sdata = rtnl_dereference(local->monitor_sdata);
 105         if (sdata)
 106                 drv_remove_interface(local, sdata);
 107
 108         /*
 109          * We disconnected on all interfaces before suspend, all channel
 110          * contexts should be released.
 111          */
 112         WARN_ON(!list_empty(&local->chanctx_list));
 113
 114         /* stop hardware - this must stop RX */
 115         if (local->open_count)
 116                 ieee80211_stop_device(local);
 117
 118  suspend:
 119         local->suspended = true;
 120         /* need suspended to be visible before quiescing is false */
 121         barrier();
 122         local->quiescing = false;
 123
 124         return 0;
 125 }
 126
 127 /*
 128  * __ieee80211_resume() is a static inline which just calls
 129  * ieee80211_reconfig(), which is also needed for hardware
 130  * hang/firmware failure/etc. recovery.
 131  */
 132
 133 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 134                                     struct cfg80211_wowlan_wakeup *wakeup,
 135                                     gfp_t gfp)
 136 {
 137         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 138
 139         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 140 }
 141 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);