Commit 834f9f61 authored by Jeff Moyer's avatar Jeff Moyer Committed by Jens Axboe
Browse files

blk-flush: fix invalid BUG_ON in blk_insert_flush

A user reported a regression due to commit
4853abaa (block: fix flush
machinery for stacking drivers with differring flush flags).
Part of the problem is that blk_insert_flush required a
single bio be attached to the request.  In reality, having
no attached bio is also a valid case, as can be observed with
an empty flush.


Reported-by: default avatarChristophe Saout <>
Signed-off-by: default avatarJeff Moyer <>
Acked-by: default avatarTejun Heo <>

Stable note: 3.1
Signed-off-by: default avatarJens Axboe <>
parent 456be148
......@@ -320,7 +320,7 @@ void blk_insert_flush(struct request *rq)
BUG_ON(!rq->bio || rq->bio != rq->biotail);
BUG_ON(rq->bio != rq->biotail); /*assumes zero or single bio rq */
* If there's data but flush is not necessary, the request can be
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment