md/raid10: reset the 'first' at the end of loop

We need to set "first = 0' at the end of rdev_for_each
loop, so we can get the array's min_offset_diff correctly
otherwise min_offset_diff just means the last rdev's
offset diff.

Suggested-by: NeilBrown <neilb@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 0f13d57ef646..e055ec94b9a8 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3769,6 +3769,7 @@ static int raid10_run(struct mddev *mddev)
 
                 if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
                         discard_supported = true;
+                first = 0;
         }
 
         if (mddev->queue) {
@@ -4172,6 +4173,7 @@ static int raid10_start_reshape(struct mddev *mddev)
                         if (first || diff < min_offset_diff)
                                 min_offset_diff = diff;
                 }
+                first = 0;
         }
 
         if (max(before_length, after_length) > min_offset_diff)