commit ada151252655b63409860e0795993cb369e667cc
author Johannes Berg <johannes.berg@intel.com> Wed Mar 28 11:04:27 2012 +0200
committer John W. Linville <linville@tuxdriver.com> Tue Apr 10 14:54:11 2012 -0400
tree f92860d8aeec0947ef28a33e9b474e234d65665f
parent ded81f6ba934e792e441f20178683608cbc0b5cb

mac80211: debounce queue stop/wake

When the queue status changes we need to do a fair
bit of work, so ignore no-op changes early.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/util.c

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 2b62307..ef725ca 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -276,6 +276,9 @@
 	if (WARN_ON(queue >= hw->queues))
 		return;
 
+	if (!test_bit(reason, &local->queue_stop_reasons[queue]))
+		return;
+
 	__clear_bit(reason, &local->queue_stop_reasons[queue]);
 
 	if (local->queue_stop_reasons[queue] != 0)
@@ -323,6 +326,9 @@
 	if (WARN_ON(queue >= hw->queues))
 		return;
 
+	if (test_bit(reason, &local->queue_stop_reasons[queue]))
+		return;
+
 	__set_bit(reason, &local->queue_stop_reasons[queue]);
 
 	rcu_read_lock();