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dm mpath: do not modify *__clone if blk_mq_alloc_request() fails 

Purely cleanup, avoids potential for strange coding bugs.  But in
reality if __multipath_map() fails the caller has no business looking at
*__clone.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Bart Van Assche 2016-11-15 15:34:32 -08:00 committed by Mike Snitzer
parent 4813577f93
commit 6599c84e4c
1 changed files with 8 additions and 7 deletions
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15
drivers/md/dm-mpath.c
View File

@ -580,16 +580,17 @@ static int __multipath_map(struct dm_target *ti, struct request *clone,
* .request_fn stacked on blk-mq path(s) and
* blk-mq stacked on blk-mq path(s).
*/
*__clone = blk_mq_alloc_request(bdev_get_queue(bdev),
rq_data_dir(rq), BLK_MQ_REQ_NOWAIT);
if (IS_ERR(*__clone)) {
/* ENOMEM, requeue */
clone = blk_mq_alloc_request(bdev_get_queue(bdev),
rq_data_dir(rq), BLK_MQ_REQ_NOWAIT);
if (IS_ERR(clone)) {
/* EBUSY, ENODEV or EWOULDBLOCK: requeue */
clear_request_fn_mpio(m, map_context);
return r;
}
(*__clone)->bio = (*__clone)->biotail = NULL;
(*__clone)->rq_disk = bdev->bd_disk;
(*__clone)->cmd_flags |= REQ_FAILFAST_TRANSPORT;
clone->bio = clone->biotail = NULL;
clone->rq_disk = bdev->bd_disk;
clone->cmd_flags |= REQ_FAILFAST_TRANSPORT;
*__clone = clone;
}
if (pgpath->pg->ps.type->start_io)