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                                         false);
  40
  41         /* flush out all packets */
  42         synchronize_net();
  43
  44         ieee80211_flush_queues(local, NULL);
  45
  46         local->quiescing = true;
  47         /* make quiescing visible to timers everywhere */
  48         mb();
  49
  50         flush_workqueue(local->workqueue);
  51
  52         /* Don't try to run timers while suspended. */
  53         del_timer_sync(&local->sta_cleanup);
  54
  55          /*
  56          * Note that this particular timer doesn't need to be
  57          * restarted at resume.
  58          */
  59         cancel_work_sync(&local->dynamic_ps_enable_work);
  60         del_timer_sync(&local->dynamic_ps_timer);
  61
  62         local->wowlan = wowlan && local->open_count;
  63         if (local->wowlan) {
  64                 int err = drv_suspend(local, wowlan);
  65                 if (err < 0) {
  66                         local->quiescing = false;
  67                         local->wowlan = false;
  68                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  69                                 mutex_lock(&local->sta_mtx);
  70                                 list_for_each_entry(sta,
  71                                                     &local->sta_list, list) {
  72                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  73                                 }
  74                                 mutex_unlock(&local->sta_mtx);
  75                         }
  76                         ieee80211_wake_queues_by_reason(hw,
  77                                         IEEE80211_MAX_QUEUE_MAP,
  78                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  79                                         false);
  80                         return err;
  81                 } else if (err > 0) {
  82                         WARN_ON(err != 1);
  83                         return err;
  84                 } else {
  85                         goto suspend;
  86                 }
  87         }
  88
  89         /* remove all interfaces that were created in the driver */
  90         list_for_each_entry(sdata, &local->interfaces, list) {
  91                 if (!ieee80211_sdata_running(sdata))
  92                         continue;
  93                 switch (sdata->vif.type) {
  94                 case NL80211_IFTYPE_AP_VLAN:
  95                 case NL80211_IFTYPE_MONITOR:
  96                         continue;
  97                 case NL80211_IFTYPE_STATION:
  98                         ieee80211_mgd_quiesce(sdata);
  99                         break;
 100                 case NL80211_IFTYPE_WDS:
 101                         /* tear down aggregation sessions and remove STAs */
 102                         mutex_lock(&local->sta_mtx);
 103                         sta = sdata->u.wds.sta;
 104                         if (sta && sta->uploaded) {
 105                                 enum ieee80211_sta_state state;
 106
 107                                 state = sta->sta_state;
 108                                 for (; state > IEEE80211_STA_NOTEXIST; state--)
 109                                         WARN_ON(drv_sta_state(local, sta->sdata,
 110                                                               sta, state,
 111                                                               state - 1));
 112                         }
 113                         mutex_unlock(&local->sta_mtx);
 114                         break;
 115                 default:
 116                         break;
 117                 }
 118
 119                 flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 120                 drv_remove_interface(local, sdata);
 121         }
 122
 123         /*
 124          * We disconnected on all interfaces before suspend, all channel
 125          * contexts should be released.
 126          */
 127         WARN_ON(!list_empty(&local->chanctx_list));
 128
 129         /* stop hardware - this must stop RX */
 130         if (local->open_count)
 131                 ieee80211_stop_device(local);
 132
 133  suspend:
 134         local->suspended = true;
 135         /* need suspended to be visible before quiescing is false */
 136         barrier();
 137         local->quiescing = false;
 138
 139         return 0;
 140 }
 141
 142 /*
 143  * __ieee80211_resume() is a static inline which just calls
 144  * ieee80211_reconfig(), which is also needed for hardware
 145  * hang/firmware failure/etc. recovery.
 146  */
 147
 148 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 149                                     struct cfg80211_wowlan_wakeup *wakeup,
 150                                     gfp_t gfp)
 151 {
 152         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 153
 154         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 155 }
 156 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);