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 /* return value indicates whether the driver should be further notified */
  10 static void ieee80211_quiesce(struct ieee80211_sub_if_data *sdata)
  11 {
  12         switch (sdata->vif.type) {
  13         case NL80211_IFTYPE_STATION:
  14                 ieee80211_sta_quiesce(sdata);
  15                 break;
  16         case NL80211_IFTYPE_ADHOC:
  17                 ieee80211_ibss_quiesce(sdata);
  18                 break;
  19         case NL80211_IFTYPE_MESH_POINT:
  20                 ieee80211_mesh_quiesce(sdata);
  21                 break;
  22         default:
  23                 break;
  24         }
  25
  26         cancel_work_sync(&sdata->work);
  27 }
  28
  29 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
  30 {
  31         struct ieee80211_local *local = hw_to_local(hw);
  32         struct ieee80211_sub_if_data *sdata;
  33         struct sta_info *sta;
  34         struct ieee80211_chanctx *ctx;
  35
  36         if (!local->open_count)
  37                 goto suspend;
  38
  39         ieee80211_scan_cancel(local);
  40
  41         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  42                 mutex_lock(&local->sta_mtx);
  43                 list_for_each_entry(sta, &local->sta_list, list) {
  44                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  45                         ieee80211_sta_tear_down_BA_sessions(
  46                                         sta, AGG_STOP_LOCAL_REQUEST);
  47                 }
  48                 mutex_unlock(&local->sta_mtx);
  49         }
  50
  51         ieee80211_stop_queues_by_reason(hw,
  52                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  53
  54         /* flush out all packets */
  55         synchronize_net();
  56
  57         drv_flush(local, false);
  58
  59         local->quiescing = true;
  60         /* make quiescing visible to timers everywhere */
  61         mb();
  62
  63         flush_workqueue(local->workqueue);
  64
  65         /* Don't try to run timers while suspended. */
  66         del_timer_sync(&local->sta_cleanup);
  67
  68          /*
  69          * Note that this particular timer doesn't need to be
  70          * restarted at resume.
  71          */
  72         cancel_work_sync(&local->dynamic_ps_enable_work);
  73         del_timer_sync(&local->dynamic_ps_timer);
  74
  75         local->wowlan = wowlan && local->open_count;
  76         if (local->wowlan) {
  77                 int err = drv_suspend(local, wowlan);
  78                 if (err < 0) {
  79                         local->quiescing = false;
  80                         local->wowlan = false;
  81                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  82                                 mutex_lock(&local->sta_mtx);
  83                                 list_for_each_entry(sta,
  84                                                     &local->sta_list, list) {
  85                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  86                                 }
  87                                 mutex_unlock(&local->sta_mtx);
  88                         }
  89                         ieee80211_wake_queues_by_reason(hw,
  90                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  91                         return err;
  92                 } else if (err > 0) {
  93                         WARN_ON(err != 1);
  94                         local->wowlan = false;
  95                 } else {
  96                         list_for_each_entry(sdata, &local->interfaces, list)
  97                                 if (ieee80211_sdata_running(sdata))
  98                                         ieee80211_quiesce(sdata);
  99                         goto suspend;
 100                 }
 101         }
 102
 103         /* disable keys */
 104         list_for_each_entry(sdata, &local->interfaces, list)
 105                 ieee80211_disable_keys(sdata);
 106
 107         /* tear down aggregation sessions and remove STAs */
 108         mutex_lock(&local->sta_mtx);
 109         list_for_each_entry(sta, &local->sta_list, list) {
 110                 if (sta->uploaded) {
 111                         enum ieee80211_sta_state state;
 112
 113                         state = sta->sta_state;
 114                         for (; state > IEEE80211_STA_NOTEXIST; state--)
 115                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
 116                                                       state, state - 1));
 117                 }
 118
 119                 mesh_plink_quiesce(sta);
 120         }
 121         mutex_unlock(&local->sta_mtx);
 122
 123         /* remove all interfaces */
 124         list_for_each_entry(sdata, &local->interfaces, list) {
 125                 static u8 zero_addr[ETH_ALEN] = {};
 126                 u32 changed = 0;
 127
 128                 if (!ieee80211_sdata_running(sdata))
 129                         continue;
 130
 131                 switch (sdata->vif.type) {
 132                 case NL80211_IFTYPE_AP_VLAN:
 133                 case NL80211_IFTYPE_MONITOR:
 134                         /* skip these */
 135                         continue;
 136                 case NL80211_IFTYPE_STATION:
 137                         if (sdata->vif.bss_conf.assoc)
 138                                 changed = BSS_CHANGED_ASSOC |
 139                                           BSS_CHANGED_BSSID |
 140                                           BSS_CHANGED_IDLE;
 141                         break;
 142                 case NL80211_IFTYPE_AP:
 143                 case NL80211_IFTYPE_ADHOC:
 144                 case NL80211_IFTYPE_MESH_POINT:
 145                         if (sdata->vif.bss_conf.enable_beacon)
 146                                 changed = BSS_CHANGED_BEACON_ENABLED;
 147                         break;
 148                 default:
 149                         break;
 150                 }
 151
 152                 ieee80211_quiesce(sdata);
 153
 154                 sdata->suspend_bss_conf = sdata->vif.bss_conf;
 155                 memset(&sdata->vif.bss_conf, 0, sizeof(sdata->vif.bss_conf));
 156                 sdata->vif.bss_conf.idle = true;
 157                 if (sdata->suspend_bss_conf.bssid)
 158                         sdata->vif.bss_conf.bssid = zero_addr;
 159
 160                 /* disable beaconing or remove association */
 161                 ieee80211_bss_info_change_notify(sdata, changed);
 162
 163                 if (sdata->vif.type == NL80211_IFTYPE_AP &&
 164                     rcu_access_pointer(sdata->u.ap.beacon))
 165                         drv_stop_ap(local, sdata);
 166
 167                 if (local->use_chanctx) {
 168                         struct ieee80211_chanctx_conf *conf;
 169
 170                         mutex_lock(&local->chanctx_mtx);
 171                         conf = rcu_dereference_protected(
 172                                         sdata->vif.chanctx_conf,
 173                                         lockdep_is_held(&local->chanctx_mtx));
 174                         if (conf) {
 175                                 ctx = container_of(conf,
 176                                                    struct ieee80211_chanctx,
 177                                                    conf);
 178                                 drv_unassign_vif_chanctx(local, sdata, ctx);
 179                         }
 180
 181                         mutex_unlock(&local->chanctx_mtx);
 182                 }
 183                 drv_remove_interface(local, sdata);
 184         }
 185
 186         sdata = rtnl_dereference(local->monitor_sdata);
 187         if (sdata) {
 188                 if (local->use_chanctx) {
 189                         struct ieee80211_chanctx_conf *conf;
 190
 191                         mutex_lock(&local->chanctx_mtx);
 192                         conf = rcu_dereference_protected(
 193                                         sdata->vif.chanctx_conf,
 194                                         lockdep_is_held(&local->chanctx_mtx));
 195                         if (conf) {
 196                                 ctx = container_of(conf,
 197                                                    struct ieee80211_chanctx,
 198                                                    conf);
 199                                 drv_unassign_vif_chanctx(local, sdata, ctx);
 200                         }
 201
 202                         mutex_unlock(&local->chanctx_mtx);
 203                 }
 204
 205                 drv_remove_interface(local, sdata);
 206         }
 207
 208         mutex_lock(&local->chanctx_mtx);
 209         list_for_each_entry(ctx, &local->chanctx_list, list)
 210                 drv_remove_chanctx(local, ctx);
 211         mutex_unlock(&local->chanctx_mtx);
 212
 213         /* stop hardware - this must stop RX */
 214         if (local->open_count)
 215                 ieee80211_stop_device(local);
 216
 217  suspend:
 218         local->suspended = true;
 219         /* need suspended to be visible before quiescing is false */
 220         barrier();
 221         local->quiescing = false;
 222
 223         return 0;
 224 }
 225
 226 /*
 227  * __ieee80211_resume() is a static inline which just calls
 228  * ieee80211_reconfig(), which is also needed for hardware
 229  * hang/firmware failure/etc. recovery.
 230  */