From: Eric Dumazet <edumazet@google.com>
Date: Thu, 12 Dec 2013 23:41:56 +0000 (-0800)
Subject: pkt_sched: set root qdisc before change() in attach_default_qdiscs()
X-Git-Tag: v3.14-rc1~94^2~496
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e57a784d8cae429f5b697fe55abf420181d9ff09;p=pandora-kernel.git

pkt_sched: set root qdisc before change() in attach_default_qdiscs()

After commit 95dc19299f74 ("pkt_sched: give visibility to mq slave
qdiscs") we call disc_list_add() while the device qdisc might be
the noop_qdisc one.

This shows up as duplicates in "tc qdisc show", as all inactive devices
point to noop_qdisc.

Fix this by setting dev->qdisc to the new qdisc before calling
ops->change() in attach_default_qdiscs()

Add a WARN_ON_ONCE() to catch any future similar problem.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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