From: Patrick McHardy <kaber@trash.net>
Date: Mon, 24 Nov 2008 23:46:08 +0000 (-0800)
Subject: pkt_sched: sch_drr: fix drr_dequeue loop()
X-Git-Tag: v2.6.29-rc1~581^2~517
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f0947c3ffaed33c1c38b79e4b17f75ba072d3e9;p=pandora-kernel.git

pkt_sched: sch_drr: fix drr_dequeue loop()

Jarek Poplawski points out:

If all child qdiscs of sch_drr are non-work-conserving (e.g. sch_tbf)
drr_dequeue() will busy-loop waiting for skbs instead of leaving the
job for a watchdog. Checking for list_empty() in each loop isn't
necessary either, because this can never be true except the first time.

Using non-work-conserving qdiscs as children of DRR makes no sense,
simply bail out in that case.

Reported-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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