[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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 3e1b633e8b0d..bc4284396fcb 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -286,7 +286,7 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
                 /* 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;