From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: [PATCH] block: early return from blk_queue_split() if q->bio_split is NULL Date: Mon, 20 Nov 2017 11:54:02 -0500 Message-ID: <20171120165401.GA10608@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-block-owner@vger.kernel.org To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, dm-devel@redhat.com List-Id: dm-devel.ids DM appears to be the only block driver that doesn't lean on the block core's bio splitting. My hope is to fix that but in the meantime it doesn't make sense for a device that doesn't need blk_queue_split() to go through the associated work. Signed-off-by: Mike Snitzer --- block/blk-merge.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-merge.c b/block/blk-merge.c index f5dedd5..212004c 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -186,6 +186,9 @@ void blk_queue_split(struct request_queue *q, struct bio **bio) struct bio *split, *res; unsigned nsegs; + if (!q->bio_split) + return; + switch (bio_op(*bio)) { case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: -- 2.10.1