linux-kernel - [PATCH AUTOSEL 4.9 04/48] swim: fix cleanup on setup error

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Message-Id: <20181031231054.29333-4-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:10:10 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Omar Sandoval <osandov@...com>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 04/48] swim: fix cleanup on setup error

From: Omar Sandoval <osandov@...com>

[ Upstream commit 1448a2a5360ae06f25e2edc61ae070dff5c0beb4 ]

If we fail to allocate the request queue for a disk, we still need to
free that disk, not just the previous ones. Additionally, we need to
cleanup the previous request queues.

Signed-off-by: Omar Sandoval <osandov@...com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/swim.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
index b5afd495d482..eec6e393c124 100644
--- a/drivers/block/swim.c
+++ b/drivers/block/swim.c
@@ -868,8 +868,17 @@ static int swim_floppy_init(struct swim_priv *swd)
 
 exit_put_disks:
 	unregister_blkdev(FLOPPY_MAJOR, "fd");
-	while (drive--)
-		put_disk(swd->unit[drive].disk);
+	do {
+		struct gendisk *disk = swd->unit[drive].disk;
+
+		if (disk) {
+			if (disk->queue) {
+				blk_cleanup_queue(disk->queue);
+				disk->queue = NULL;
+			}
+			put_disk(disk);
+		}
+	} while (drive--);
 	return err;
 }
 
-- 
2.17.1