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

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 @@ int qdisc_restart(struct net_device *dev)
netif_schedule(dev);
return 1;
}
BUG_ON((int) q->q.qlen < 0);
return q->q.qlen;
}