From: weiping zhang <zhangweiping@didichuxing.com>
Date: Tue, 31 Oct 2017 18:38:59 +0800
Subject: [PATCH] block: add WARN_ON if bdi register fail
Git-commit: 3a92168bc8a113098b44a95d499557a88bb387da
Patch-mainline: v4.15-rc2
References: bsc#1104967,FATE#325924
device_add_disk need do more safety error handle, so this patch just
add WARN_ON.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Adapted for current series by me.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
block/genhd.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/block/genhd.c b/block/genhd.c
index c2223f12a805..c143a2274238 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -671,10 +671,13 @@ void device_add_disk(struct device *parent, struct gendisk *disk)
disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
disk->flags |= GENHD_FL_NO_PART_SCAN;
} else {
+ int ret;
+
/* Register BDI before referencing it from bdev */
disk_to_dev(disk)->devt = devt;
- bdi_register_owner(disk->queue->backing_dev_info,
- disk_to_dev(disk));
+ ret = bdi_register_owner(disk->queue->backing_dev_info,
+ disk_to_dev(disk));
+ WARN_ON(ret);
blk_register_region(disk_devt(disk), disk->minors, NULL,
exact_match, exact_lock, disk);
}
--
2.16.4