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         ieee80211_roc_purge(local, NULL);
  23
  24         ieee80211_del_virtual_monitor(local);
  25
  26         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  27                 mutex_lock(&local->sta_mtx);
  28                 list_for_each_entry(sta, &local->sta_list, list) {
  29                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  30                         ieee80211_sta_tear_down_BA_sessions(
  31                                         sta, AGG_STOP_LOCAL_REQUEST);
  32                 }
  33                 mutex_unlock(&local->sta_mtx);
  34         }
  35
  36         ieee80211_stop_queues_by_reason(hw,
  37                                         IEEE80211_MAX_QUEUE_MAP,
  38                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  39
  40         /* flush out all packets */
  41         synchronize_net();
  42
  43         ieee80211_flush_queues(local, NULL);
  44
  45         local->quiescing = true;
  46         /* make quiescing visible to timers everywhere */
  47         mb();
  48
  49         flush_workqueue(local->workqueue);
  50
  51         /* Don't try to run timers while suspended. */
  52         del_timer_sync(&local->sta_cleanup);
  53
  54          /*
  55          * Note that this particular timer doesn't need to be
  56          * restarted at resume.
  57          */
  58         cancel_work_sync(&local->dynamic_ps_enable_work);
  59         del_timer_sync(&local->dynamic_ps_timer);
  60
  61         local->wowlan = wowlan && local->open_count;
  62         if (local->wowlan) {
  63                 int err = drv_suspend(local, wowlan);
  64                 if (err < 0) {
  65                         local->quiescing = false;
  66                         local->wowlan = false;
  67                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  68                                 mutex_lock(&local->sta_mtx);
  69                                 list_for_each_entry(sta,
  70                                                     &local->sta_list, list) {
  71                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  72                                 }
  73                                 mutex_unlock(&local->sta_mtx);
  74                         }
  75                         ieee80211_wake_queues_by_reason(hw,
  76                                         IEEE80211_MAX_QUEUE_MAP,
  77                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  78                         return err;
  79                 } else if (err > 0) {
  80                         WARN_ON(err != 1);
  81                         return err;
  82                 } else {
  83                         goto suspend;
  84                 }
  85         }
  86
  87         /* tear down aggregation sessions and remove STAs */
  88         mutex_lock(&local->sta_mtx);
  89         list_for_each_entry(sta, &local->sta_list, list) {
  90                 if (sta->uploaded) {
  91                         enum ieee80211_sta_state state;
  92
  93                         state = sta->sta_state;
  94                         for (; state > IEEE80211_STA_NOTEXIST; state--)
  95                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
  96                                                       state, state - 1));
  97                 }
  98         }
  99         mutex_unlock(&local->sta_mtx);
 100
 101         /* remove all interfaces that were created in the driver */
 102         list_for_each_entry(sdata, &local->interfaces, list) {
 103                 if (!ieee80211_sdata_running(sdata))
 104                         continue;
 105                 switch (sdata->vif.type) {
 106                 case NL80211_IFTYPE_AP_VLAN:
 107                 case NL80211_IFTYPE_MONITOR:
 108                         continue;
 109                 case NL80211_IFTYPE_STATION:
 110                         ieee80211_mgd_quiesce(sdata);
 111                         break;
 112                 default:
 113                         break;
 114                 }
 115
 116                 drv_remove_interface(local, sdata);
 117         }
 118
 119         /*
 120          * We disconnected on all interfaces before suspend, all channel
 121          * contexts should be released.
 122          */
 123         WARN_ON(!list_empty(&local->chanctx_list));
 124
 125         /* stop hardware - this must stop RX */
 126         if (local->open_count)
 127                 ieee80211_stop_device(local);
 128
 129  suspend:
 130         local->suspended = true;
 131         /* need suspended to be visible before quiescing is false */
 132         barrier();
 133         local->quiescing = false;
 134
 135         return 0;
 136 }
 137
 138 /*
 139  * __ieee80211_resume() is a static inline which just calls
 140  * ieee80211_reconfig(), which is also needed for hardware
 141  * hang/firmware failure/etc. recovery.
 142  */
 143
 144 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 145                                     struct cfg80211_wowlan_wakeup *wakeup,
 146                                     gfp_t gfp)
 147 {
 148         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 149
 150         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 151 }
 152 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);