blk-mq: Only register debugfs attributes for blk-mq queues

The code in blk-mq-debugfs.c assumes that it is working on a blk-mq
queue and is not intended to work on a blk-sq queue. Hence only
register blk-mq debugfs attributes for blk-mq queues.

Fixes: commit 9c1051aacde8 ("blk-mq: untangle debugfs and sysfs")
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 504fee9..712b018 100644 (file)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -887,10 +887,10 @@ int blk_register_queue(struct gendisk *disk)
                goto unlock;
        }
 
-       if (q->mq_ops)
+       if (q->mq_ops) {
                __blk_mq_register_dev(dev, q);
-
-       blk_mq_debugfs_register(q);
+               blk_mq_debugfs_register(q);
+       }
 
        kobject_uevent(&q->kobj, KOBJ_ADD);