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             !(wowlan && wowlan->any)) {
  28                 mutex_lock(&local->sta_mtx);
  29                 list_for_each_entry(sta, &local->sta_list, list) {
  30                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  31                         ieee80211_sta_tear_down_BA_sessions(
  32                                         sta, AGG_STOP_LOCAL_REQUEST);
  33                 }
  34                 mutex_unlock(&local->sta_mtx);
  35         }
  36
  37         ieee80211_stop_queues_by_reason(hw,
  38                                         IEEE80211_MAX_QUEUE_MAP,
  39                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
  40                                         false);
  41
  42         /* flush out all packets */
  43         synchronize_net();
  44
  45         ieee80211_flush_queues(local, NULL, true);
  46
  47         local->quiescing = true;
  48         /* make quiescing visible to timers everywhere */
  49         mb();
  50
  51         flush_workqueue(local->workqueue);
  52
  53         /* Don't try to run timers while suspended. */
  54         del_timer_sync(&local->sta_cleanup);
  55
  56          /*
  57          * Note that this particular timer doesn't need to be
  58          * restarted at resume.
  59          */
  60         cancel_work_sync(&local->dynamic_ps_enable_work);
  61         del_timer_sync(&local->dynamic_ps_timer);
  62
  63         local->wowlan = wowlan;
  64         if (local->wowlan) {
  65                 int err;
  66
  67                 /* Drivers don't expect to suspend while some operations like
  68                  * authenticating or associating are in progress. It doesn't
  69                  * make sense anyway to accept that, since the authentication
  70                  * or association would never finish since the driver can't do
  71                  * that on its own.
  72                  * Thus, clean up in-progress auth/assoc first.
  73                  */
  74                 list_for_each_entry(sdata, &local->interfaces, list) {
  75                         if (!ieee80211_sdata_running(sdata))
  76                                 continue;
  77                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
  78                                 continue;
  79                         ieee80211_mgd_quiesce(sdata);
  80                         /* If suspended during TX in progress, and wowlan
  81                          * is enabled (connection will be active) there
  82                          * can be a race where the driver is put out
  83                          * of power-save due to TX and during suspend
  84                          * dynamic_ps_timer is cancelled and TX packet
  85                          * is flushed, leaving the driver in ACTIVE even
  86                          * after resuming until dynamic_ps_timer puts
  87                          * driver back in DOZE.
  88                          */
  89                         if (sdata->u.mgd.associated &&
  90                             sdata->u.mgd.powersave &&
  91                              !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
  92                                 local->hw.conf.flags |= IEEE80211_CONF_PS;
  93                                 ieee80211_hw_config(local,
  94                                                     IEEE80211_CONF_CHANGE_PS);
  95                         }
  96                 }
  97
  98                 err = drv_suspend(local, wowlan);
  99                 if (err < 0) {
 100                         local->quiescing = false;
 101                         local->wowlan = false;
 102                         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
 103                                 mutex_lock(&local->sta_mtx);
 104                                 list_for_each_entry(sta,
 105                                                     &local->sta_list, list) {
 106                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 107                                 }
 108                                 mutex_unlock(&local->sta_mtx);
 109                         }
 110                         ieee80211_wake_queues_by_reason(hw,
 111                                         IEEE80211_MAX_QUEUE_MAP,
 112                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 113                                         false);
 114                         return err;
 115                 } else if (err > 0) {
 116                         WARN_ON(err != 1);
 117                         /* cfg80211 will call back into mac80211 to disconnect
 118                          * all interfaces, allow that to proceed properly
 119                          */
 120                         ieee80211_wake_queues_by_reason(hw,
 121                                         IEEE80211_MAX_QUEUE_MAP,
 122                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 123                                         false);
 124                         return err;
 125                 } else {
 126                         goto suspend;
 127                 }
 128         }
 129
 130         /* remove all interfaces that were created in the driver */
 131         list_for_each_entry(sdata, &local->interfaces, list) {
 132                 if (!ieee80211_sdata_running(sdata))
 133                         continue;
 134                 switch (sdata->vif.type) {
 135                 case NL80211_IFTYPE_AP_VLAN:
 136                 case NL80211_IFTYPE_MONITOR:
 137                         continue;
 138                 case NL80211_IFTYPE_STATION:
 139                         ieee80211_mgd_quiesce(sdata);
 140                         break;
 141                 case NL80211_IFTYPE_WDS:
 142                         /* tear down aggregation sessions and remove STAs */
 143                         mutex_lock(&local->sta_mtx);
 144                         sta = sdata->u.wds.sta;
 145                         if (sta && sta->uploaded) {
 146                                 enum ieee80211_sta_state state;
 147
 148                                 state = sta->sta_state;
 149                                 for (; state > IEEE80211_STA_NOTEXIST; state--)
 150                                         WARN_ON(drv_sta_state(local, sta->sdata,
 151                                                               sta, state,
 152                                                               state - 1));
 153                         }
 154                         mutex_unlock(&local->sta_mtx);
 155                         break;
 156                 default:
 157                         break;
 158                 }
 159
 160                 drv_remove_interface(local, sdata);
 161         }
 162
 163         /*
 164          * We disconnected on all interfaces before suspend, all channel
 165          * contexts should be released.
 166          */
 167         WARN_ON(!list_empty(&local->chanctx_list));
 168
 169         /* stop hardware - this must stop RX */
 170         if (local->open_count)
 171                 ieee80211_stop_device(local);
 172
 173  suspend:
 174         local->suspended = true;
 175         /* need suspended to be visible before quiescing is false */
 176         barrier();
 177         local->quiescing = false;
 178
 179         return 0;
 180 }
 181
 182 /*
 183  * __ieee80211_resume() is a static inline which just calls
 184  * ieee80211_reconfig(), which is also needed for hardware
 185  * hang/firmware failure/etc. recovery.
 186  */
 187
 188 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 189                                     struct cfg80211_wowlan_wakeup *wakeup,
 190                                     gfp_t gfp)
 191 {
 192         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 193
 194         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 195 }
 196 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);