From: David S. Miller <davem@davemloft.net>
Date: Wed, 16 Jul 2008 08:42:40 +0000 (-0700)
Subject: pkt_sched: Add and use qdisc_root() and qdisc_root_lock().
X-Git-Tag: v2.6.27-rc1~969^2~66
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7698b4fcabcd790efc4f226bada1e7b5870653af;p=pandora-kernel.git

pkt_sched: Add and use qdisc_root() and qdisc_root_lock().

When code wants to lock the qdisc tree state, the logic
operation it's doing is locking the top-level qdisc that
sits of the root of the netdev_queue.

Add qdisc_root_lock() to represent this and convert the
easiest cases.

In order for this to work out in all cases, we have to
hook up the noop_qdisc to a dummy netdev_queue.

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