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authorBen Greear <greearb@candelatech.com>2013-06-13 01:08:44 +0400
committerJohannes Berg <johannes.berg@intel.com>2013-06-13 12:27:07 +0400
commite562078a19226660299eeaf40a50752672214f11 (patch)
tree09e911481176393b8e47913a594fce34828fb8a9
parent661eb3811df568161399af0048f1ecb4ac073687 (diff)
downloadlinux-e562078a19226660299eeaf40a50752672214f11.tar.xz
mac80211: Ensure tid_start_tx is protected by sta->lock
All accesses of the tid_start_tx lock should be protected by sta->lock if there is any chance that another thread could still be accessing the sta object. Signed-off-by: Ben Greear <greearb@candelatech.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--net/mac80211/ht.c4
-rw-r--r--net/mac80211/sta_info.h1
2 files changed, 4 insertions, 1 deletions
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 75dff338f581..f83534f6a2ee 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -281,13 +281,14 @@ void ieee80211_ba_session_work(struct work_struct *work)
sta, tid, WLAN_BACK_RECIPIENT,
WLAN_REASON_UNSPECIFIED, true);
+ spin_lock_bh(&sta->lock);
+
tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
if (tid_tx) {
/*
* Assign it over to the normal tid_tx array
* where it "goes live".
*/
- spin_lock_bh(&sta->lock);
sta->ampdu_mlme.tid_start_tx[tid] = NULL;
/* could there be a race? */
@@ -300,6 +301,7 @@ void ieee80211_ba_session_work(struct work_struct *work)
ieee80211_tx_ba_session_handle_start(sta, tid);
continue;
}
+ spin_unlock_bh(&sta->lock);
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index bd12fc54266c..4208dbd5861f 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -203,6 +203,7 @@ struct tid_ampdu_rx {
* driver requested to close until the work for it runs
* @mtx: mutex to protect all TX data (except non-NULL assignments
* to tid_tx[idx], which are protected by the sta spinlock)
+ * tid_start_tx is also protected by sta->lock.
*/
struct sta_ampdu_mlme {
struct mutex mtx;