linux-kernel - [PATCH 3.18 096/183] dm: fix missed error code if .end_io isnt implemented by target

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Date:	Sun, 25 Jan 2015 10:06:58 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Alex Chen <alex.chen@...wei.com>,
	Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 3.18 096/183] dm: fix missed error code if .end_io isnt implemented by target_type

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: zhendong chen <alex.chen@...wei.com>

commit 5164bece1673cdf04782f8ed3fba70743700f5da upstream.

In bio-based DM's clone_endio(), when target_type doesn't implement
.end_io (e.g. linear) r will be always be initialized 0.  So if a
WRITE SAME bio fails WRITE SAME will not be disabled as intended.

Fix this by initializing r to error, rather than 0, in clone_endio().

Signed-off-by: Alex Chen <alex.chen@...wei.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Fixes: 7eee4ae2db ("dm: disable WRITE SAME if it fails")
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -899,7 +899,7 @@ static void disable_write_same(struct ma
 
 static void clone_endio(struct bio *bio, int error)
 {
-	int r = 0;
+	int r = error;
 	struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
 	struct dm_io *io = tio->io;
 	struct mapped_device *md = tio->io->md;


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