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dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue() 

Otherwise the request-based DM blk-mq request_queue will be put into
service without being properly exported via sysfs.

Cc: stable@vger.kernel.org
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Bart Van Assche 2017-04-27 10:11:19 -07:00 committed by Mike Snitzer
parent c1d7ecf7ca
commit 23a6012489
1 changed files with 5 additions and 1 deletions
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6
drivers/md/dm-rq.c
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@ -809,10 +809,14 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
dm_init_md_queue(md);
/* backfill 'mq' sysfs registration normally done in blk_register_queue */
blk_mq_register_dev(disk_to_dev(md->disk), q);
err = blk_mq_register_dev(disk_to_dev(md->disk), q);
if (err)
goto out_cleanup_queue;
return 0;
out_cleanup_queue:
blk_cleanup_queue(q);
out_tag_set:
blk_mq_free_tag_set(md->tag_set);
out_kfree_tag_set: