From 45ceeee81ecdd437f7ecac77ae79263486c755e8 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 16 Mar 2015 09:08:20 +0100 Subject: [PATCH] mac80211: add comment for rx_path_lock Add a comment explaining how the RX path lock is used. Signed-off-by: Johannes Berg --- 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))) { -- 2.20.1