mac80211: Ensure tid_start_tx is protected by sta->lock.

Commit Message

Ben Greear June 12, 2013, 9:08 p.m. UTC

From: Ben Greear <[e-mail]>

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 <[e-mail]>
---
 net/mac80211/ht.c       |    4 +++-
 net/mac80211/sta_info.h |    1 +
 2 files changed, 4 insertions(+), 1 deletions(-)

Comments

Johannes Berg June 13, 2013, 8:28 a.m. UTC | #1

On Wed, 2013-06-12 at 14:08 -0700, [e-mail] wrote:
> From: Ben Greear <[e-mail]>
> 
> 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.

Applied.

johannes

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Patch

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 0db25d4..87b8b23 100644
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -283,13 +283,14 @@  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? */
@@ -302,6 +303,7 @@  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 c509423..de40c5b 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -204,6 +204,7 @@  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;