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-Tag: v4.9.90~61
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2710fb8f0c828656a147870dccc5164c0f0c48ea;p=platform%2Fkernel%2Flinux-amlogic.git

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


[ Upstream commit b506335e5d2b4ec687dde392a3bdbf7601778f1d ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index b1daff78f7b2..18a4271bf569 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4089,6 +4089,7 @@ static int raid10_start_reshape(struct mddev *mddev)
 				diff = 0;
 			if (first || diff < min_offset_diff)
 				min_offset_diff = diff;
+			first = 0;
 		}
 	}