From: Shaohua Li <shli@fb.com>
Date: Mon, 1 May 2017 19:15:07 +0000 (-0700)
Subject: md/raid10: skip spare disk as 'first' disk
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b506335e5d2b4ec687dde392a3bdbf7601778f1d;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

md/raid10: skip spare disk as 'first' disk

Commit 6f287ca(md/raid10: reset the 'first' at the end of loop) ignores
a case in reshape, the first rdev could be a spare disk, which shouldn't
be accounted as the first disk since it doesn't include the offset info.

Fix: 6f287ca(md/raid10: reset the 'first' at the end of loop)
Cc: Guoqing Jiang <gqjiang@suse.com>
Cc: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
---

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 2883b720a265..cce23be9cc93 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4079,8 +4079,8 @@ static int raid10_start_reshape(struct mddev *mddev)
 				diff = 0;
 			if (first || diff < min_offset_diff)
 				min_offset_diff = diff;
+			first = 0;
 		}
-		first = 0;
 	}
 
 	if (max(before_length, after_length) > min_offset_diff)