From: Namhyung Kim Date: Mon, 13 Jun 2011 05:48:22 +0000 (+0900) Subject: md/raid5: fix raid5_set_bi_hw_segments X-Git-Tag: firefly_0821_release~10164^2~6^2~17 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6f4976aa404e521e7d57f1b703856210a3669683;p=firefly-linux-kernel-4.4.55.git md/raid5: fix raid5_set_bi_hw_segments 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 Signed-off-by: NeilBrown Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 23949739fc25..05e8eecdb079 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -127,7 +127,7 @@ 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 */