From: David S. Miller <davem@davemloft.net>
Date: Wed, 13 Aug 2008 22:18:38 +0000 (-0700)
Subject: pkt_sched: Fix queue quiescence testing in dev_deactivate().
X-Git-Tag: v2.6.27-rc4~103^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b9a3b1102bc80b4044224494100f67de132d5448;p=pandora-kernel.git

pkt_sched: Fix queue quiescence testing in dev_deactivate().

Based upon discussions with Jarek P. and Herbert Xu.

First, we're testing the wrong qdisc.  We just reset the device
queue qdiscs to &noop_qdisc and checking it's state is completely
pointless here.

We want to wait until the previous qdisc that was sitting at
the ->qdisc pointer is not busy any more.  And that would be
->qdisc_sleeping.

Because of how we propagate the samples qdisc pointer down into
qdisc_run and friends via per-cpu ->output_queue and netif_schedule,
we have to wait also for the __QDISC_STATE_SCHED bit to clear as
well.

Signed-off-by: David S. Miller <davem@davemloft.net>
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