From: Eric Dumazet <edumazet@google.com>
Date: Wed, 5 Mar 2014 18:14:34 +0000 (-0800)
Subject: net_sched: htb: do not acquire qdisc lock in dump operations
X-Git-Tag: v3.15-rc1~113^2~214
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6f542efcbc74801eb4bfa0dbba64c2df6811b2d3;p=pandora-kernel.git

net_sched: htb: do not acquire qdisc lock in dump operations

htb_dump() and htb_dump_class() do not strictly need to acquire
qdisc lock to fetch qdisc and/or class parameters.

We hold RTNL and no changes can occur.

This reduces by 50% qdisc lock pressure while doing tc qdisc|class dump
operations.

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