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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-10-31 13:24:28 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-11-08 09:10:29 -0700 |
| commit | ef0899410ff630b2e75306da49996dbbfa318165 (patch) | |
| tree | 1e29b53d1e1b7fc0f455cdd92e6e2fb15d4d13b7 /drivers | |
| parent | b88fac630bf71bd0af44502d6688e99a5426d438 (diff) | |
| download | op-kernel-dev-ef0899410ff630b2e75306da49996dbbfa318165.zip op-kernel-dev-ef0899410ff630b2e75306da49996dbbfa318165.tar.gz | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/block/dasd.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 451bf99..846d5c6 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -2978,12 +2978,12 @@ static int dasd_alloc_queue(struct dasd_block *block) elevator_exit(block->request_queue->elevator); block->request_queue->elevator = NULL; + mutex_lock(&block->request_queue->sysfs_lock); rc = elevator_init(block->request_queue, "deadline"); - if (rc) { + if (rc) blk_cleanup_queue(block->request_queue); - return rc; - } - return 0; + mutex_unlock(&block->request_queue->sysfs_lock); + return rc; } /* |
