commit 76d643cd3bd2b4a1e27e3eafee8e37be9c681792
author Patrick McHardy <kaber@trash.net> Fri Mar 23 11:27:04 2007 -0700
committer David S. Miller <davem@sunset.davemloft.net> Wed Apr 25 22:27:47 2007 -0700
tree de8ede0c0700755caf16ca9d3dc4dba06075984d
parent c7bf5f9dc2f78ae8ebbfffc5f17becd0d9e6ba9e

[NET_SCHED]: sch_netem: fix off-by-one in send time comparison

netem checks PSCHED_TLESS(cb->time_to_send, now) to find out whether it is
allowed to send a packet, which is equivalent to cb->time_to_send < now.
Use !PSCHED_TLESS(now, cb->time_to_send) instead to properly handle
cb->time_to_send == now.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_netem.c

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 3e1b633..bc42843 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -286,7 +286,7 @@
 		/* if more time remaining? */
 		PSCHED_GET_TIME(now);
 
-		if (PSCHED_TLESS(cb->time_to_send, now)) {
+		if (!PSCHED_TLESS(now, cb->time_to_send)) {
 			pr_debug("netem_dequeue: return skb=%p\n", skb);
 			sch->q.qlen--;
 			return skb;