linux-kernel - [PATCH 1/2] block: cleanup error handling in sg

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Date:	Sun, 20 Jul 2014 12:23:23 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] block: cleanup error handling in sg_io

Make sure we always clean up through the out label and just have
a single place to put the request.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/scsi_ioctl.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 14695c6..c4e6633 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -272,7 +272,6 @@ static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
 	r = blk_rq_unmap_user(bio);
 	if (!ret)
 		ret = r;
-	blk_put_request(rq);
 
 	return ret;
 }
@@ -312,10 +311,9 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 		return -ENOMEM;
 	blk_rq_set_block_pc(rq);
 
-	if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
-		blk_put_request(rq);
-		return -EFAULT;
-	}
+	ret = -EFAULT;
+	if (blk_fill_sghdr_rq(q, rq, hdr, mode))
+		goto out;
 
 	if (hdr->iovec_count) {
 		size_t iov_data_len;
@@ -366,7 +364,7 @@ static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
 
 	hdr->duration = jiffies_to_msecs(jiffies - start_time);
 
-	return blk_complete_sghdr_rq(rq, hdr, bio);
+	ret = blk_complete_sghdr_rq(rq, hdr, bio);
 out:
 	blk_put_request(rq);
 	return ret;
-- 
1.9.1

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