From: Joe Thornber <ejt@redhat.com>
Date: Thu, 11 Jun 2015 16:11:48 +0000 (+0100)
Subject: dm thin metadata: fix a race when entering fail mode
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~116^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1f11aff04cc86daa0757ada5deb669a92a8f0fb;p=pandora-kernel.git

dm thin metadata: fix a race when entering fail mode

In dm_thin_find_block() the ->fail_io flag was checked outside the
metadata device's root_lock, causing dm_thin_find_block() to race with
the setting of this flag.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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