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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 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 (hw->flags & IEEE80211_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 
 40         /* flush out all packets and station cleanup call_rcu()s */
 41         synchronize_net();
 42         rcu_barrier();
 43 
 44         ieee80211_flush_queues(local, NULL);
 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 && local->open_count;
 63         if (local->wowlan) {
 64                 int err = drv_suspend(local, wowlan);
 65                 if (err < 0) {
 66                         local->quiescing = false;
 67                         local->wowlan = false;
 68                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
 69                                 mutex_lock(&local->sta_mtx);
 70                                 list_for_each_entry(sta,
 71                                                     &local->sta_list, list) {
 72                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 73                                 }
 74                                 mutex_unlock(&local->sta_mtx);
 75                         }
 76                         ieee80211_wake_queues_by_reason(hw,
 77                                         IEEE80211_MAX_QUEUE_MAP,
 78                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 79                         return err;
 80                 } else if (err > 0) {
 81                         WARN_ON(err != 1);
 82                         return err;
 83                 } else {
 84                         goto suspend;
 85                 }
 86         }
 87 
 88         /* tear down aggregation sessions and remove STAs */
 89         mutex_lock(&local->sta_mtx);
 90         list_for_each_entry(sta, &local->sta_list, list) {
 91                 if (sta->uploaded) {
 92                         enum ieee80211_sta_state state;
 93 
 94                         state = sta->sta_state;
 95                         for (; state > IEEE80211_STA_NOTEXIST; state--)
 96                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
 97                                                       state, state - 1));
 98                 }
 99         }
100         mutex_unlock(&local->sta_mtx);
101 
102         /* remove all interfaces that were created in the driver */
103         list_for_each_entry(sdata, &local->interfaces, list) {
104                 if (!ieee80211_sdata_running(sdata) ||
105                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
106                     sdata->vif.type == NL80211_IFTYPE_MONITOR)
107                         continue;
108 
109                 drv_remove_interface(local, sdata);
110         }
111 
112         /*
113          * We disconnected on all interfaces before suspend, all channel
114          * contexts should be released.
115          */
116         WARN_ON(!list_empty(&local->chanctx_list));
117 
118         /* stop hardware - this must stop RX */
119         if (local->open_count)
120                 ieee80211_stop_device(local);
121 
122  suspend:
123         local->suspended = true;
124         /* need suspended to be visible before quiescing is false */
125         barrier();
126         local->quiescing = false;
127 
128         return 0;
129 }
130 
131 /*
132  * __ieee80211_resume() is a static inline which just calls
133  * ieee80211_reconfig(), which is also needed for hardware
134  * hang/firmware failure/etc. recovery.
135  */
136 
137 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
138                                     struct cfg80211_wowlan_wakeup *wakeup,
139                                     gfp_t gfp)
140 {
141         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
142 
143         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
144 }
145 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);
146 

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