From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
---
net/mac80211/ht.c | 4 +++-
net/mac80211/sta_info.h | 1 +
2 files changed, 4 insertions(+), 1 deletions(-)
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;
--
1.7.3.4
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