Re: [PATCH 4/4] block: add WARN_ON if bdi register fail

device_add_disk need do more safety error handle, so this patch just
add WARN_ON.

Signed-off-by: weiping zhang <redacted>
---
 block/genhd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index dd305c65ffb0..cb55eea821eb 100644
--- a/block/genhd.c
+++ b/block/genhd.c

@@ -660,7 +660,9 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
 
 	/* Register BDI before referencing it from bdev */
 	bdi = disk->queue->backing_dev_info;
-	bdi_register_owner(bdi, disk_to_dev(disk));
+	retval = bdi_register_owner(bdi, disk_to_dev(disk));
+	if (retval)
+		WARN_ON(1);