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