[PATCH 4/4] block: add WARN_ON if bdi register fail
From: weiping zhang <hidden>
Date: 2017-10-26 17:36:49
Also in:
linux-mm
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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); blk_register_region(disk_devt(disk), disk->minors, NULL, exact_match, exact_lock, disk);
--
2.14.2