1 files changed, 8 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 6ce62e553dc2..32345b479adb 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -639,6 +639,14 @@ struct ieee80211_local {
         struct sk_buff_head pending[IEEE80211_MAX_QUEUES];
         struct tasklet_struct tx_pending_tasklet;
 
+        /*
+         * This lock is used to prevent concurrent A-MPDU
+         * session start/stop processing, this thus also
+         * synchronises the ->ampdu_action() callback to
+         * drivers and limits it to one at a time.
+         */
+        spinlock_t ampdu_lock;
+
         /* number of interfaces with corresponding IFF_ flags */
         atomic_t iff_allmultis, iff_promiscs;