linux-kernel - [PATCH V6 07/17] block: ublk_drv: add common exit handling

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Date:   Thu, 30 Mar 2023 19:36:20 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-block@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Miklos Szeredi <mszeredi@...hat.com>,
        ZiyangZhang <ZiyangZhang@...ux.alibaba.com>,
        Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>,
        Bernd Schubert <bschubert@....com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V6 07/17] block: ublk_drv: add common exit handling

Simplify exit handling a bit, and prepare for supporting fused command.

Reviewed-by: Ziyang Zhang <ZiyangZhang@...ux.alibaba.com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 drivers/block/ublk_drv.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index c73cc57ec547..bc46616710d4 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -655,14 +655,15 @@ static void ublk_complete_rq(struct request *req)
 	struct ublk_queue *ubq = req->mq_hctx->driver_data;
 	struct ublk_io *io = &ubq->ios[req->tag];
 	unsigned int unmapped_bytes;
+	blk_status_t res = BLK_STS_OK;
 
 	/* failed read IO if nothing is read */
 	if (!io->res && req_op(req) == REQ_OP_READ)
 		io->res = -EIO;
 
 	if (io->res < 0) {
-		blk_mq_end_request(req, errno_to_blk_status(io->res));
-		return;
+		res = errno_to_blk_status(io->res);
+		goto exit;
 	}
 
 	/*
@@ -671,10 +672,8 @@ static void ublk_complete_rq(struct request *req)
 	 *
 	 * Both the two needn't unmap.
 	 */
-	if (req_op(req) != REQ_OP_READ && req_op(req) != REQ_OP_WRITE) {
-		blk_mq_end_request(req, BLK_STS_OK);
-		return;
-	}
+	if (req_op(req) != REQ_OP_READ && req_op(req) != REQ_OP_WRITE)
+		goto exit;
 
 	/* for READ request, writing data in iod->addr to rq buffers */
 	unmapped_bytes = ublk_unmap_io(ubq, req, io);
@@ -691,6 +690,10 @@ static void ublk_complete_rq(struct request *req)
 		blk_mq_requeue_request(req, true);
 	else
 		__blk_mq_end_request(req, BLK_STS_OK);
+
+	return;
+exit:
+	blk_mq_end_request(req, res);
 }
 
 /*
-- 
2.39.2