s390/dasd: hold request queue sysfs lock when calling elevator_init()
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Thu, 31 Oct 2013 12:24:28 +0000 (13:24 +0100)
committerJens Axboe <axboe@kernel.dk>
Fri, 8 Nov 2013 16:10:29 +0000 (09:10 -0700)
commitef0899410ff630b2e75306da49996dbbfa318165
tree1e29b53d1e1b7fc0f455cdd92e6e2fb15d4d13b7
parentb88fac630bf71bd0af44502d6688e99a5426d438
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>
drivers/s390/block/dasd.c