From: Wang YanQing <udknight@gmail.com>
Date: Tue, 23 Jun 2015 10:54:45 +0000 (+0800)
Subject: fs:super:get_anon_bdev: fix race condition could cause dev exceed its upper limitation
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~6^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1af95de6f0119d5bde02d3a811a9f3a3661e954e;p=pandora-kernel.git

fs:super:get_anon_bdev: fix race condition could cause dev exceed its upper limitation

Execution of get_anon_bdev concurrently and preemptive kernel all
could bring race condition, it isn't enough to check dev against
its upper limitation with equality operator only.

This patch fix it.

Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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