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| author | Jeff Moyer <jmoyer@redhat.com> | 2011-10-17 14:57:22 +0400 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2011-10-24 18:24:30 +0400 |
| commit | 834f9f61a525d2f6d3d0c93894e26326c8d3ceed (patch) | |
| tree | 73e973ad0c01ce4ac0317f089c9cbb3707186834 /block/blk-flush.c | |
| parent | 456be1484ffc72a24bdb4200b5847c4fa90139d9 (diff) | |
| download | linux-834f9f61a525d2f6d3d0c93894e26326c8d3ceed.tar.xz | |
blk-flush: fix invalid BUG_ON in blk_insert_flush
A user reported a regression due to commit
4853abaae7e4a2af938115ce9071ef8684fb7af4 (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.
[1] http://www.redhat.com/archives/dm-devel/2011-September/msg00154.html
Reported-by: Christophe Saout <christophe@saout.de>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com
Acked-by: Tejun Heo <tj@kernel.org>
Stable note: 3.1
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-flush.c')
| -rw-r--r-- | block/blk-flush.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c index 491eb30a242d..89ae3b9bf7ca 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -320,7 +320,7 @@ void blk_insert_flush(struct request *rq) return; } - 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 |