linux-kernel - [PATCH] [56/99] md/raid5: fix raid5_set_bi_hw

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Message-Id: <20110727214855.530AD2403FF@tassilo.jf.intel.com>
Date:	Wed, 27 Jul 2011 14:48:55 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	namhyung@...il.com, neilb@...e.de, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [56/99] md/raid5: fix raid5_set_bi_hw_segments

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Namhyung Kim <namhyung@...il.com>

commit 9b2dc8b665932a8e681a7ab3237f60475e75e161 upstream.

The @bio->bi_phys_segments consists of active stripes count in the
lower 16 bits and processed stripes count in the upper 16 bits. So
logical-OR operator should be bitwise one.

This bug has been present since 2.6.27 and the fix is suitable for any
-stable kernel since then.  Fortunately the bad code is only used on
error paths and is relatively unlikely to be hit.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/md/raid5.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.35.y/drivers/md/raid5.c
===================================================================
--- linux-2.6.35.y.orig/drivers/md/raid5.c
+++ linux-2.6.35.y/drivers/md/raid5.c
@@ -129,7 +129,7 @@ static inline int raid5_dec_bi_hw_segmen
 
 static inline void raid5_set_bi_hw_segments(struct bio *bio, unsigned int cnt)
 {
-	bio->bi_phys_segments = raid5_bi_phys_segments(bio) || (cnt << 16);
+	bio->bi_phys_segments = raid5_bi_phys_segments(bio) | (cnt << 16);
 }
 
 /* Find first data disk in a raid6 stripe */
--
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