From ecf177df3b63d88f6fb5e10683004f50b6dfe116 Mon Sep 17 00:00:00 2001 From: Junichi Nomura Date: Tue, 22 Dec 2015 10:23:44 -0700 Subject: [PATCH] block: ensure to split after potentially bouncing a bio commit 23688bf4f830a89866fd0ed3501e342a7360fe4f upstream. blk_queue_bio() does split then bounce, which makes the segment counting based on pages before bouncing and could go wrong. Move the split to after bouncing, like we do for blk-mq, and the we fix the issue of having the bio count for segments be wrong. Fixes: 54efd50bfd87 ("block: make generic_make_request handle arbitrarily sized bios") Tested-by: Artem S. Tashkinov Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index 77f1fa3d4e0fc..b128c16093476 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1616,8 +1616,6 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio) struct request *req; unsigned int request_count = 0; - blk_queue_split(q, &bio, q->bio_split); - /* * low level driver can indicate that it wants pages above a * certain limit bounced to low memory (ie for highmem, or even @@ -1625,6 +1623,8 @@ static void blk_queue_bio(struct request_queue *q, struct bio *bio) */ blk_queue_bounce(q, &bio); + blk_queue_split(q, &bio, q->bio_split); + if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { bio->bi_error = -EIO; bio_endio(bio); -- 2.47.2