Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6-microblaze.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 static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
10 {
11         if (ieee80211_request_sched_scan_stop(local))
12                 return;
13         cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
14 }
15
16 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
17 {
18         struct ieee80211_local *local = hw_to_local(hw);
19         struct ieee80211_sub_if_data *sdata;
20         struct sta_info *sta;
21
22         if (!local->open_count)
23                 goto suspend;
24
25         ieee80211_scan_cancel(local);
26
27         ieee80211_dfs_cac_cancel(local);
28
29         ieee80211_roc_purge(local, NULL);
30
31         ieee80211_del_virtual_monitor(local);
32
33         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
34             !(wowlan && wowlan->any)) {
35                 mutex_lock(&local->sta_mtx);
36                 list_for_each_entry(sta, &local->sta_list, list) {
37                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
38                         ieee80211_sta_tear_down_BA_sessions(
39                                         sta, AGG_STOP_LOCAL_REQUEST);
40                 }
41                 mutex_unlock(&local->sta_mtx);
42         }
43
44         /* keep sched_scan only in case of 'any' trigger */
45         if (!(wowlan && wowlan->any))
46                 ieee80211_sched_scan_cancel(local);
47
48         ieee80211_stop_queues_by_reason(hw,
49                                         IEEE80211_MAX_QUEUE_MAP,
50                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
51                                         false);
52
53         /* flush out all packets */
54         synchronize_net();
55
56         ieee80211_flush_queues(local, NULL, true);
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;
75         if (local->wowlan) {
76                 int err;
77
78                 /* Drivers don't expect to suspend while some operations like
79                  * authenticating or associating are in progress. It doesn't
80                  * make sense anyway to accept that, since the authentication
81                  * or association would never finish since the driver can't do
82                  * that on its own.
83                  * Thus, clean up in-progress auth/assoc first.
84                  */
85                 list_for_each_entry(sdata, &local->interfaces, list) {
86                         if (!ieee80211_sdata_running(sdata))
87                                 continue;
88                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
89                                 continue;
90                         ieee80211_mgd_quiesce(sdata);
91                         /* If suspended during TX in progress, and wowlan
92                          * is enabled (connection will be active) there
93                          * can be a race where the driver is put out
94                          * of power-save due to TX and during suspend
95                          * dynamic_ps_timer is cancelled and TX packet
96                          * is flushed, leaving the driver in ACTIVE even
97                          * after resuming until dynamic_ps_timer puts
98                          * driver back in DOZE.
99                          */
100                         if (sdata->u.mgd.associated &&
101                             sdata->u.mgd.powersave &&
102                              !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
103                                 local->hw.conf.flags |= IEEE80211_CONF_PS;
104                                 ieee80211_hw_config(local,
105                                                     IEEE80211_CONF_CHANGE_PS);
106                         }
107                 }
108
109                 err = drv_suspend(local, wowlan);
110                 if (err < 0) {
111                         local->quiescing = false;
112                         local->wowlan = false;
113                         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
114                                 mutex_lock(&local->sta_mtx);
115                                 list_for_each_entry(sta,
116                                                     &local->sta_list, list) {
117                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
118                                 }
119                                 mutex_unlock(&local->sta_mtx);
120                         }
121                         ieee80211_wake_queues_by_reason(hw,
122                                         IEEE80211_MAX_QUEUE_MAP,
123                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
124                                         false);
125                         return err;
126                 } else if (err > 0) {
127                         WARN_ON(err != 1);
128                         /* cfg80211 will call back into mac80211 to disconnect
129                          * all interfaces, allow that to proceed properly
130                          */
131                         ieee80211_wake_queues_by_reason(hw,
132                                         IEEE80211_MAX_QUEUE_MAP,
133                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
134                                         false);
135                         return err;
136                 } else {
137                         goto suspend;
138                 }
139         }
140
141         /* remove all interfaces that were created in the driver */
142         list_for_each_entry(sdata, &local->interfaces, list) {
143                 if (!ieee80211_sdata_running(sdata))
144                         continue;
145                 switch (sdata->vif.type) {
146                 case NL80211_IFTYPE_AP_VLAN:
147                 case NL80211_IFTYPE_MONITOR:
148                         continue;
149                 case NL80211_IFTYPE_STATION:
150                         ieee80211_mgd_quiesce(sdata);
151                         break;
152                 case NL80211_IFTYPE_WDS:
153                         /* tear down aggregation sessions and remove STAs */
154                         mutex_lock(&local->sta_mtx);
155                         sta = sdata->u.wds.sta;
156                         if (sta && sta->uploaded) {
157                                 enum ieee80211_sta_state state;
158
159                                 state = sta->sta_state;
160                                 for (; state > IEEE80211_STA_NOTEXIST; state--)
161                                         WARN_ON(drv_sta_state(local, sta->sdata,
162                                                               sta, state,
163                                                               state - 1));
164                         }
165                         mutex_unlock(&local->sta_mtx);
166                         break;
167                 default:
168                         break;
169                 }
170
171                 drv_remove_interface(local, sdata);
172         }
173
174         /*
175          * We disconnected on all interfaces before suspend, all channel
176          * contexts should be released.
177          */
178         WARN_ON(!list_empty(&local->chanctx_list));
179
180         /* stop hardware - this must stop RX */
181         if (local->open_count)
182                 ieee80211_stop_device(local);
183
184  suspend:
185         local->suspended = true;
186         /* need suspended to be visible before quiescing is false */
187         barrier();
188         local->quiescing = false;
189
190         return 0;
191 }
192
193 /*
194  * __ieee80211_resume() is a static inline which just calls
195  * ieee80211_reconfig(), which is also needed for hardware
196  * hang/firmware failure/etc. recovery.
197  */
198
199 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
200                                     struct cfg80211_wowlan_wakeup *wakeup,
201                                     gfp_t gfp)
202 {
203         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
204
205         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
206 }
207 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);