mac80211: reconfigure tx on device reconfiguration
[linux-2.6.git] / 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 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_flags(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->vif);
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  */