From: Jarek Poplawski <jarkao2@gmail.com>
Date: Thu, 21 Aug 2008 12:11:14 +0000 (-0700)
Subject: pkt_sched: Fix qdisc_watchdog() vs. dev_deactivate() race
X-Git-Tag: v2.6.27-rc5~42^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2540e0511ea17e25831be543cdf9381e6209950d;p=pandora-kernel.git

pkt_sched: Fix qdisc_watchdog() vs. dev_deactivate() race

dev_deactivate() can skip rescheduling of a qdisc by qdisc_watchdog()
or other timer calling netif_schedule() after dev_queue_deactivate().
We prevent this checking aliveness before scheduling the timer. Since
during deactivation the root qdisc is available only as qdisc_sleeping
additional accessor qdisc_root_sleeping() is created.

With feedback from Herbert Xu <herbert@gondor.apana.org.au>

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