block: use default groups to register the queue attributes

Set up the default_groups for blk_queue_ktype instead of manually calling
sysfs_create_group.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20220628171850.1313069-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-sysfs.c

@@ -795,7 +795,13 @@ static const struct sysfs_ops queue_sysfs_ops = {
 	.store	= queue_attr_store,
 };
 
+static const struct attribute_group *blk_queue_attr_groups[] = {
+	&queue_attr_group,
+	NULL
+};
+
 struct kobj_type blk_queue_ktype = {
+	.default_groups = blk_queue_attr_groups,
 	.sysfs_ops	= &queue_sysfs_ops,
 	.release	= blk_release_queue,
 };
@@ -816,12 +822,6 @@ int blk_register_queue(struct gendisk *disk)
 	if (ret < 0)
 		goto unlock;
 
-	ret = sysfs_create_group(&q->kobj, &queue_attr_group);
-	if (ret) {
-		kobject_del(&q->kobj);
-		goto unlock;
-	}
-
 	if (queue_is_mq(q))
 		__blk_mq_register_dev(dev, q);
 	mutex_lock(&q->sysfs_lock);