linux-kernel - [PATCH 02/14] block: switch register_disk to use blkdev_get_by

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Message-Id: <20200917165720.3285256-3-hch@lst.de>
Date:   Thu, 17 Sep 2020 18:57:08 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Josef Bacik <josef@...icpanda.com>,
        Minchan Kim <minchan@...nel.org>,
        Stefan Haberland <sth@...ux.ibm.com>,
        Jan Hoeppner <hoeppner@...ux.ibm.com>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, Len Brown <len.brown@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, nbd@...er.debian.org,
        linux-ide@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, ocfs2-devel@....oracle.com,
        linux-pm@...r.kernel.org, linux-mm@...ck.org,
        linux-block@...r.kernel.org
Subject: [PATCH 02/14] block: switch register_disk to use blkdev_get_by_dev

Use blkdev_get_by_dev instead of open coding it using bdget_disk +
blkdev_get.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/genhd.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 7b56203c90a303..f778716fac6cde 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -732,10 +732,9 @@ static void register_disk(struct device *parent, struct gendisk *disk,
 		goto exit;
 
 	set_bit(GD_NEED_PART_SCAN, &disk->state);
-	err = blkdev_get(bdev, FMODE_READ, NULL);
-	if (err < 0)
-		goto exit;
-	blkdev_put(bdev, FMODE_READ);
+	bdev = blkdev_get_by_dev(disk_devt(disk), FMODE_READ, NULL);
+	if (!IS_ERR(bdev))
+		blkdev_put(bdev, FMODE_READ);
 
 exit:
 	/* announce disk after possible partitions are created */
-- 
2.28.0