1 files changed, 3 insertions, 0 deletions

diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 500bafe0a0bb..10d0fcb417ae 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -142,8 +142,11 @@ struct tid_ampdu_rx {
  * @work: work struct for starting/stopping aggregation
  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
  *      RX timer expired 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)
  */
 struct sta_ampdu_mlme {
+        struct mutex mtx;
         /* rx */
         struct tid_ampdu_rx *tid_rx[STA_TID_NUM];
         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(STA_TID_NUM)];