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[PKT_SCHED]: netetm: trap infinite loop hange on qlen underflow

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Due to bugs in netem (fixed by later patches), it is possible to get qdisc
qlen to go negative. If this happens the CPU ends up spinning forever
in qdisc_run(). So add a BUG_ON() to trap it.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2005-05-03 16:24:03 -07:00 committed by David S. Miller
parent bd96535b81
commit 8cbe1d46d6
1 changed files with 1 additions and 0 deletions
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net/sched/sch_generic.c
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@ -179,6 +179,7 @@ requeue:
netif_schedule(dev);
return 1;
}
BUG_ON((int) q->q.qlen < 0);
return q->q.qlen;
}