From: SandeepKsinha <sandeepksinha@gmail.com>
Date: Wed, 17 Jun 2009 22:49:35 +0000 (+1000)
Subject: md linear: Protecting mddev with rcu locks to avoid races
X-Git-Tag: v2.6.31-rc1~143^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=af11c397fd8835c70ec0bb777104e4ab98b2d660;p=pandora-kernel.git

md linear: Protecting mddev with rcu locks to avoid races


Due to the lack of memory ordering guarantees, we may have races around
mddev->conf.

In particular, the correct contents of the structure we get from
dereferencing ->private might not be visible to this CPU yet, and
they might not be correct w.r.t mddev->raid_disks.

This patch addresses the problem using rcu protection to avoid
such race conditions.

Signed-off-by: SandeepKsinha <sandeepksinha@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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