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 (ieee80211_hw_check(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, true);
  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;
  63         if (local->wowlan) {
  64                 int err;
  65
  66                 /* Drivers don't expect to suspend while some operations like
  67                  * authenticating or associating are in progress. It doesn't
  68                  * make sense anyway to accept that, since the authentication
  69                  * or association would never finish since the driver can't do
  70                  * that on its own.
  71                  * Thus, clean up in-progress auth/assoc first.
  72                  */
  73                 list_for_each_entry(sdata, &local->interfaces, list) {
  74                         if (!ieee80211_sdata_running(sdata))
  75                                 continue;
  76                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  77                                 continue;
  78                         ieee80211_mgd_quiesce(sdata);
  79                         /* If suspended during TX in progress, and wowlan
  80                          * is enabled (connection will be active) there
  81                          * can be a race where the driver is put out
  82                          * of power-save due to TX and during suspend
  83                          * dynamic_ps_timer is cancelled and TX packet
  84                          * is flushed, leaving the driver in ACTIVE even
  85                          * after resuming until dynamic_ps_timer puts
  86                          * driver back in DOZE.
  87                          */
  88                         if (sdata->u.mgd.associated &&
  89                             sdata->u.mgd.powersave &&
  90                              !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
  91                                 local->hw.conf.flags |= IEEE80211_CONF_PS;
  92                                 ieee80211_hw_config(local,
  93                                                     IEEE80211_CONF_CHANGE_PS);
  94                         }
  95                 }
  96
  97                 err = drv_suspend(local, wowlan);
  98                 if (err < 0) {
  99                         local->quiescing = false;
 100                         local->wowlan = false;
 101                         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
 102                                 mutex_lock(&local->sta_mtx);
 103                                 list_for_each_entry(sta,
 104                                                     &local->sta_list, list) {
 105                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 106                                 }
 107                                 mutex_unlock(&local->sta_mtx);
 108                         }
 109                         ieee80211_wake_queues_by_reason(hw,
 110                                         IEEE80211_MAX_QUEUE_MAP,
 111                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 112                                         false);
 113                         return err;
 114                 } else if (err > 0) {
 115                         WARN_ON(err != 1);
 116                         /* cfg80211 will call back into mac80211 to disconnect
 117                          * all interfaces, allow that to proceed properly
 118                          */
 119                         ieee80211_wake_queues_by_reason(hw,
 120                                         IEEE80211_MAX_QUEUE_MAP,
 121                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 122                                         false);
 123                         return err;
 124                 } else {
 125                         goto suspend;
 126                 }
 127         }
 128
 129         /* remove all interfaces that were created in the driver */
 130         list_for_each_entry(sdata, &local->interfaces, list) {
 131                 if (!ieee80211_sdata_running(sdata))
 132                         continue;
 133                 switch (sdata->vif.type) {
 134                 case NL80211_IFTYPE_AP_VLAN:
 135                 case NL80211_IFTYPE_MONITOR:
 136                         continue;
 137                 case NL80211_IFTYPE_STATION:
 138                         ieee80211_mgd_quiesce(sdata);
 139                         break;
 140                 case NL80211_IFTYPE_WDS:
 141                         /* tear down aggregation sessions and remove STAs */
 142                         mutex_lock(&local->sta_mtx);
 143                         sta = sdata->u.wds.sta;
 144                         if (sta && sta->uploaded) {
 145                                 enum ieee80211_sta_state state;
 146
 147                                 state = sta->sta_state;
 148                                 for (; state > IEEE80211_STA_NOTEXIST; state--)
 149                                         WARN_ON(drv_sta_state(local, sta->sdata,
 150                                                               sta, state,
 151                                                               state - 1));
 152                         }
 153                         mutex_unlock(&local->sta_mtx);
 154                         break;
 155                 default:
 156                         break;
 157                 }
 158
 159                 drv_remove_interface(local, sdata);
 160         }
 161
 162         /*
 163          * We disconnected on all interfaces before suspend, all channel
 164          * contexts should be released.
 165          */
 166         WARN_ON(!list_empty(&local->chanctx_list));
 167
 168         /* stop hardware - this must stop RX */
 169         if (local->open_count)
 170                 ieee80211_stop_device(local);
 171
 172  suspend:
 173         local->suspended = true;
 174         /* need suspended to be visible before quiescing is false */
 175         barrier();
 176         local->quiescing = false;
 177
 178         return 0;
 179 }
 180
 181 /*
 182  * __ieee80211_resume() is a static inline which just calls
 183  * ieee80211_reconfig(), which is also needed for hardware
 184  * hang/firmware failure/etc. recovery.
 185  */
 186
 187 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 188                                     struct cfg80211_wowlan_wakeup *wakeup,
 189                                     gfp_t gfp)
 190 {
 191         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 192
 193         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 194 }
 195 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);