diff options
| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-10-31 13:24:28 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-23 21:38:20 -0700 |
| commit | ed93fb01a3991ced713a37bc844ed2f2abef8ea8 (patch) | |
| tree | 8c2010da4dbf37be27f99cb9241c312060fc993f /drivers/s390 | |
| parent | 5a0b9c33b0a361a7b82fc4ae509bfc1df004f2c0 (diff) | |
s390/dasd: hold request queue sysfs lock when calling elevator_init()
commit ef0899410ff630b2e75306da49996dbbfa318165 upstream.
"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>
Cc: Christian Borntraeger <christian@borntraeger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/s390')
| -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 d72a9216ee2e..e91ec8cd9b09 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -2879,12 +2879,12 @@ 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; } /* |