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[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>
hifive-unleashed-5.1
Patrick McHardy 2007-03-23 11:27:04 -07:00 committed by David S. Miller
parent c7bf5f9dc2
commit 76d643cd3b
1 changed files with 1 additions and 1 deletions
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2
net/sched/sch_netem.c
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@ -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;