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TOMOYO Linux Cross Reference
Linux/net/mac80211/pm.c

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  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 bool 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                 return true;
 16         case NL80211_IFTYPE_ADHOC:
 17                 ieee80211_ibss_quiesce(sdata);
 18                 return true;
 19         case NL80211_IFTYPE_MESH_POINT:
 20                 ieee80211_mesh_quiesce(sdata);
 21                 return true;
 22         case NL80211_IFTYPE_AP_VLAN:
 23         case NL80211_IFTYPE_MONITOR:
 24                 /* don't tell driver about this */
 25                 return false;
 26         default:
 27                 return true;
 28         }
 29 }
 30 
 31 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 32 {
 33         struct ieee80211_local *local = hw_to_local(hw);
 34         struct ieee80211_sub_if_data *sdata;
 35         struct sta_info *sta;
 36 
 37         if (!local->open_count)
 38                 goto suspend;
 39 
 40         ieee80211_scan_cancel(local);
 41 
 42         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
 43                 mutex_lock(&local->sta_mtx);
 44                 list_for_each_entry(sta, &local->sta_list, list) {
 45                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 46                         ieee80211_sta_tear_down_BA_sessions(sta, true);
 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                         return err;
 81                 } else if (err > 0) {
 82                         WARN_ON(err != 1);
 83                         local->wowlan = false;
 84                 } else {
 85                         list_for_each_entry(sdata, &local->interfaces, list) {
 86                                 cancel_work_sync(&sdata->work);
 87                                 ieee80211_quiesce(sdata);
 88                         }
 89                         goto suspend;
 90                 }
 91         }
 92 
 93         /* disable keys */
 94         list_for_each_entry(sdata, &local->interfaces, list)
 95                 ieee80211_disable_keys(sdata);
 96 
 97         /* tear down aggregation sessions and remove STAs */
 98         mutex_lock(&local->sta_mtx);
 99         list_for_each_entry(sta, &local->sta_list, list) {
100                 if (sta->uploaded) {
101                         sdata = sta->sdata;
102                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
103                                 sdata = container_of(sdata->bss,
104                                              struct ieee80211_sub_if_data,
105                                              u.ap);
106 
107                         drv_sta_remove(local, sdata, &sta->sta);
108                 }
109 
110                 mesh_plink_quiesce(sta);
111         }
112         mutex_unlock(&local->sta_mtx);
113 
114         /* remove all interfaces */
115         list_for_each_entry(sdata, &local->interfaces, list) {
116                 cancel_work_sync(&sdata->work);
117 
118                 if (!ieee80211_quiesce(sdata))
119                         continue;
120 
121                 if (!ieee80211_sdata_running(sdata))
122                         continue;
123 
124                 /* disable beaconing */
125                 ieee80211_bss_info_change_notify(sdata,
126                         BSS_CHANGED_BEACON_ENABLED);
127 
128                 drv_remove_interface(local, sdata);
129         }
130 
131         /* stop hardware - this must stop RX */
132         if (local->open_count)
133                 ieee80211_stop_device(local);
134 
135  suspend:
136         local->suspended = true;
137         /* need suspended to be visible before quiescing is false */
138         barrier();
139         local->quiescing = false;
140 
141         return 0;
142 }
143 
144 /*
145  * __ieee80211_resume() is a static inline which just calls
146  * ieee80211_reconfig(), which is also needed for hardware
147  * hang/firmware failure/etc. recovery.
148  */
149 

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