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authorJohannes Berg <johannes.berg@intel.com>2010-06-10 10:21:29 +0200
committerJohn W. Linville <linville@tuxdriver.com>2010-06-14 21:38:16 +0200
commit2a419056c15478d2df3f3e9d4fa64e34eb1faa7d (patch)
tree680342d6b883c18eec9003f2b93abd8ffd1e6ae6 /net/mac80211/pm.c
parentcfg80211/mac80211: allow action frame TX/RX in IBSS (diff)
downloadlinux-2a419056c15478d2df3f3e9d4fa64e34eb1faa7d.tar.xz
linux-2a419056c15478d2df3f3e9d4fa64e34eb1faa7d.zip
mac80211: simplify station/aggregation code
A number of places use RCU locking for accessing the station list, even though they do not need to. Use mutex locking instead to prepare for the locking changes I want to make. The mlme code is also using a WLAN_STA_DISASSOC flag that has the same meaning as WLAN_STA_BLOCK_BA, so use that. While doing so, combine places where we loop over stations twice, and optimise away some of the loops by checking if the hardware supports aggregation at all first. Also fix a more theoretical race condition: right now we could resume, set up an aggregation session, and right after tear it down again due to the code that is needed for hardware reconfiguration here. Also mark add a comment to that code marking it as a workaround. Finally, remove a pointless aggregation disabling loop when an interface is stopped, directly after that we remove all stations from it which will also disable all aggregation sessions that may still be active, and does so in a race-free way unlike the current loop that doesn't block new sessions. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/pm.c')
-rw-r--r--net/mac80211/pm.c16
1 files changed, 4 insertions, 12 deletions
diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index 75202b295a4e..e145a949b820 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -40,22 +40,14 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
list_for_each_entry(sdata, &local->interfaces, list)
ieee80211_disable_keys(sdata);
- /* Tear down aggregation sessions */
-
- rcu_read_lock();
-
- if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
- list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ /* tear down aggregation sessions and remove STAs */
+ mutex_lock(&local->sta_mtx);
+ list_for_each_entry(sta, &local->sta_list, list) {
+ if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
set_sta_flags(sta, WLAN_STA_BLOCK_BA);
ieee80211_sta_tear_down_BA_sessions(sta);
}
- }
-
- rcu_read_unlock();
- /* remove STAs */
- mutex_lock(&local->sta_mtx);
- list_for_each_entry(sta, &local->sta_list, list) {
if (sta->uploaded) {
sdata = sta->sdata;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)