From: Johannes Berg <johannes.berg@intel.com>
Date: Mon, 16 Mar 2015 08:08:20 +0000 (+0100)
Subject: mac80211: add comment for rx_path_lock
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=45ceeee81ecdd437f7ecac77ae79263486c755e8;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

mac80211: add comment for rx_path_lock

Add a comment explaining how the RX path lock is used.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

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))) {