[PATCH RFC 3/6] block: Handle bio_split() errors in bio_submit_split()

[John Garry <john.g.garry@xxxxxxxxxx>]

bio_split() may error, so check this.

Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
Should we move the WARN_ON_ONCE(bio_zone_write_plugging(bio)) call (not
shown) in bio_submit_split() to bio_split()?

 block/blk-merge.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index ad763ec313b6..ec7be2031819 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -118,6 +118,11 @@ static struct bio *bio_submit_split(struct bio *bio, int split_sectors)
 
 		split = bio_split(bio, split_sectors, GFP_NOIO,
 				&bio->bi_bdev->bd_disk->bio_split);
+		if (IS_ERR(split)) {
+			bio->bi_status = errno_to_blk_status(PTR_ERR(split));
+			bio_endio(bio);
+			return NULL;
+		}
 		split->bi_opf |= REQ_NOMERGE;
 		blkcg_bio_issue_init(split);
 		bio_chain(split, bio);
-- 
2.31.1