dm rq: check blk_mq_register_dev() return value in dm_mq_init_request_queue()
commit 23a601248958fa4142d49294352fe8d1fdf3e509 upstream.
Otherwise the request-based DM blk-mq request_queue will be put into
service without being properly exported via sysfs.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 2c96542..ba7c4c6 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -997,10 +997,14 @@
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: