[PATCH] mac80211: add comment for rx_path_lock
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2015-03-16 08:08:49
Subsystem:
mac80211, the rest · Maintainers:
Johannes Berg, Linus Torvalds
From: Johannes Berg <redacted> Add a comment explaining how the RX path lock is used. Signed-off-by: Johannes Berg <redacted> --- net/mac80211/rx.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index bdabf349c6ee..6accd61ee54b 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c@@ -3123,6 +3123,12 @@ static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, goto rxh_next; \ } while (0); + /* Lock here to avoid hitting all of the data used in the RX + * path (e.g. key data, station data, ...) concurrently when + * a frame is released from the reorder buffer due to timeout + * from the timer, potentially concurrently with RX from the + * driver. + */ spin_lock_bh(&rx->local->rx_path_lock); while ((skb = __skb_dequeue(frames))) {
--
2.1.4