linux-kernel - [PATCH AUTOSEL for 4.14 032/135] badblocks: fix wrong return value in badblocks

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Date:   Thu, 7 Dec 2017 15:45:37 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Liu Bo <bo.li.liu@...cle.com>, Shaohua Li <shli@...com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 032/135] badblocks: fix wrong return value in
 badblocks_set if badblocks are disabled

From: Liu Bo <bo.li.liu@...cle.com>

[ Upstream commit 39b4954c0a1556f8f7f1fdcf59a227117fcd8a0b ]

MD's rdev_set_badblocks() expects that badblocks_set() returns 1 if
badblocks are disabled, otherwise, rdev_set_badblocks() will record
superblock changes and return success in that case and md will fail to
report an IO error which it should.

This bug has existed since badblocks were introduced in commit
9e0e252a048b ("badblocks: Add core badblock management code").

Signed-off-by: Liu Bo <bo.li.liu@...cle.com>
Acked-by: Guoqing Jiang <gqjiang@...e.com>
Signed-off-by: Shaohua Li <shli@...com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 block/badblocks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/badblocks.c b/block/badblocks.c
index 43c71166e1e2..91f7bcf979d3 100644
--- a/block/badblocks.c
+++ b/block/badblocks.c
@@ -178,7 +178,7 @@ int badblocks_set(struct badblocks *bb, sector_t s, int sectors,
 
 	if (bb->shift < 0)
 		/* badblocks are disabled */
-		return 0;
+		return 1;
 
 	if (bb->shift) {
 		/* round the start down, and the end up */
-- 
2.11.0