From: Jarek Poplawski <jarkao2@gmail.com>
Date: Tue, 20 Jan 2009 22:08:23 +0000 (-0800)
Subject: pkt_sched: cls_u32: Fix locking in u32_change()
X-Git-Tag: v2.6.27.13~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c20cba0d08f3c6c10e0181077cca7f1833ffdb6b;p=pandora-kernel.git

pkt_sched: cls_u32: Fix locking in u32_change()

[ Upstream commit: 6f57321422e0d359e83c978c2b03db77b967b7d5 ]

New nodes are inserted in u32_change() under rtnl_lock() with wmb(),
so without tcf_tree_lock() like in other classifiers (e.g. cls_fw).
This isn't enough without rmb() on the read side, but on the other
hand adding such barriers doesn't give any savings, so the lock is
added instead.

Reported-by: m0sia <m0sia@plotinka.ru>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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