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md/raid5: fix raid5_set_bi_hw_segments

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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.

Cc: [email protected]
Signed-off-by: Namhyung Kim <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
This commit is contained in:
Namhyung Kim 2011-06-13 14:48:22 +09:00 • committed by NeilBrown
commit 9b2dc8b665
1 changed files with 1 additions and 1 deletions
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2
drivers/md/raid5.c
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@ -129,7 +129,7 @@ static inline int raid5_dec_bi_hw_segments(struct bio *bio)
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 */