[PATCH AUTOSEL for 3.18 39/53] md/raid10: skip spare disk as 'first' disk

[Sasha Levin]

From: Shaohua Li <s...@fb.com>

[ 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 <gqji...@suse.com>
Cc: NeilBrown <ne...@suse.com>
Signed-off-by: Shaohua Li <s...@fb.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/md/raid10.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index d207748fdc41..432c17fa636e 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -4132,6 +4132,7 @@ static int raid10_start_reshape(struct mddev *mddev)
                                diff = 0;
                        if (first || diff < min_offset_diff)
                                min_offset_diff = diff;
+                       first = 0;
                }
        }
 
-- 
2.14.1