From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Thu, 31 Oct 2013 12:24:28 +0000 (+0100)
Subject: s390/dasd: hold request queue sysfs lock when calling elevator_init()
X-Git-Tag: v3.13-rc1~100^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ef0899410ff630b2e75306da49996dbbfa318165;p=pandora-kernel.git

s390/dasd: hold request queue sysfs lock when calling elevator_init()

"elevator: Fix a race in elevator switching and md device initialization"
changed the semantics of elevator_init() in a way that now enforces to hold
the corresponding request queue's sysfs_lock when calling elevator_init()
to fix a race.
The patch did not convert the s390 dasd device driver which is the only
device driver which also calls elevator_init(). So add the missing locking.

Cc: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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