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authorJohannes Berg <johannes@sipsolutions.net>2009-03-14 04:42:49 -0400
committerJohn W. Linville <linville@tuxdriver.com>2009-03-27 20:12:53 -0400
commit7f0216a49bea717b9606b81c60f2f0b6152123eb (patch)
tree8e28ac84644a13fbb68e79d4c307cc7ea40a167a /net/mac80211/pm.c
parent8fdc621dc743b87879ccf0177969864b09388d9a (diff)
mac80211: acquire sta_lock for station suspend/resume
To avoid concurrent manipulations of the sta list (which shouldn't be possible at this point, but anyway) we need to hold the sta_lock around iterating the list. At the same time, we do not need to iterate the list at all if the driver doesn't want to be notified. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Bob Copeland <me@bobcopeland.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/pm.c')
-rw-r--r--net/mac80211/pm.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index c923ceb089a3..ef7be1ce2c87 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -10,6 +10,7 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
10 struct ieee80211_sub_if_data *sdata; 10 struct ieee80211_sub_if_data *sdata;
11 struct ieee80211_if_init_conf conf; 11 struct ieee80211_if_init_conf conf;
12 struct sta_info *sta; 12 struct sta_info *sta;
13 unsigned long flags;
13 14
14 ieee80211_stop_queues_by_reason(hw, 15 ieee80211_stop_queues_by_reason(hw,
15 IEEE80211_QUEUE_STOP_REASON_SUSPEND); 16 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
@@ -21,9 +22,9 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
21 ieee80211_disable_keys(sdata); 22 ieee80211_disable_keys(sdata);
22 23
23 /* remove STAs */ 24 /* remove STAs */
24 list_for_each_entry(sta, &local->sta_list, list) { 25 if (local->ops->sta_notify) {
25 26 spin_lock_irqsave(&local->sta_lock, flags);
26 if (local->ops->sta_notify) { 27 list_for_each_entry(sta, &local->sta_list, list) {
27 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 28 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
28 sdata = container_of(sdata->bss, 29 sdata = container_of(sdata->bss,
29 struct ieee80211_sub_if_data, 30 struct ieee80211_sub_if_data,
@@ -32,11 +33,11 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
32 local->ops->sta_notify(hw, &sdata->vif, 33 local->ops->sta_notify(hw, &sdata->vif,
33 STA_NOTIFY_REMOVE, &sta->sta); 34 STA_NOTIFY_REMOVE, &sta->sta);
34 } 35 }
36 spin_unlock_irqrestore(&local->sta_lock, flags);
35 } 37 }
36 38
37 /* remove all interfaces */ 39 /* remove all interfaces */
38 list_for_each_entry(sdata, &local->interfaces, list) { 40 list_for_each_entry(sdata, &local->interfaces, list) {
39
40 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 41 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
41 sdata->vif.type != NL80211_IFTYPE_MONITOR && 42 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
42 netif_running(sdata->dev)) { 43 netif_running(sdata->dev)) {
@@ -64,6 +65,7 @@ int __ieee80211_resume(struct ieee80211_hw *hw)
64 struct ieee80211_sub_if_data *sdata; 65 struct ieee80211_sub_if_data *sdata;
65 struct ieee80211_if_init_conf conf; 66 struct ieee80211_if_init_conf conf;
66 struct sta_info *sta; 67 struct sta_info *sta;
68 unsigned long flags;
67 int res; 69 int res;
68 70
69 /* restart hardware */ 71 /* restart hardware */
@@ -75,7 +77,6 @@ int __ieee80211_resume(struct ieee80211_hw *hw)
75 77
76 /* add interfaces */ 78 /* add interfaces */
77 list_for_each_entry(sdata, &local->interfaces, list) { 79 list_for_each_entry(sdata, &local->interfaces, list) {
78
79 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN && 80 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
80 sdata->vif.type != NL80211_IFTYPE_MONITOR && 81 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
81 netif_running(sdata->dev)) { 82 netif_running(sdata->dev)) {
@@ -87,9 +88,9 @@ int __ieee80211_resume(struct ieee80211_hw *hw)
87 } 88 }
88 89
89 /* add STAs back */ 90 /* add STAs back */
90 list_for_each_entry(sta, &local->sta_list, list) { 91 if (local->ops->sta_notify) {
91 92 spin_lock_irqsave(&local->sta_lock, flags);
92 if (local->ops->sta_notify) { 93 list_for_each_entry(sta, &local->sta_list, list) {
93 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 94 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
94 sdata = container_of(sdata->bss, 95 sdata = container_of(sdata->bss,
95 struct ieee80211_sub_if_data, 96 struct ieee80211_sub_if_data,
@@ -98,6 +99,7 @@ int __ieee80211_resume(struct ieee80211_hw *hw)
98 local->ops->sta_notify(hw, &sdata->vif, 99 local->ops->sta_notify(hw, &sdata->vif,
99 STA_NOTIFY_ADD, &sta->sta); 100 STA_NOTIFY_ADD, &sta->sta);
100 } 101 }
102 spin_unlock_irqrestore(&local->sta_lock, flags);
101 } 103 }
102 104
103 /* add back keys */ 105 /* add back keys */