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 and station cleanup call_rcu()s */
  41         synchronize_net();
  42         rcu_barrier();
  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                         return err;
  80                 } else if (err > 0) {
  81                         WARN_ON(err != 1);
  82                         return err;
  83                 } else {
  84                         goto suspend;
  85                 }
  86         }
  87
  88         /* tear down aggregation sessions and remove STAs */
  89         mutex_lock(&local->sta_mtx);
  90         list_for_each_entry(sta, &local->sta_list, list) {
  91                 if (sta->uploaded) {
  92                         enum ieee80211_sta_state state;
  93
  94                         state = sta->sta_state;
  95                         for (; state > IEEE80211_STA_NOTEXIST; state--)
  96                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
  97                                                       state, state - 1));
  98                 }
  99         }
 100         mutex_unlock(&local->sta_mtx);
 101
 102         /* remove all interfaces */
 103         list_for_each_entry(sdata, &local->interfaces, list) {
 104                 if (!ieee80211_sdata_running(sdata))
 105                         continue;
 106                 drv_remove_interface(local, sdata);
 107         }
 108
 109         /*
 110          * We disconnected on all interfaces before suspend, all channel
 111          * contexts should be released.
 112          */
 113         WARN_ON(!list_empty(&local->chanctx_list));
 114
 115         /* stop hardware - this must stop RX */
 116         if (local->open_count)
 117                 ieee80211_stop_device(local);
 118
 119  suspend:
 120         local->suspended = true;
 121         /* need suspended to be visible before quiescing is false */
 122         barrier();
 123         local->quiescing = false;
 124
 125         return 0;
 126 }
 127
 128 /*
 129  * __ieee80211_resume() is a static inline which just calls
 130  * ieee80211_reconfig(), which is also needed for hardware
 131  * hang/firmware failure/etc. recovery.
 132  */
 133
 134 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 135                                     struct cfg80211_wowlan_wakeup *wakeup,
 136                                     gfp_t gfp)
 137 {
 138         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 139
 140         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 141 }
 142 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);