1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/md/raid6main.c b/drivers/md/raid6main.c
index 00da37848d05..0000d162d198 100644
--- a/drivers/md/raid6main.c
+++ b/drivers/md/raid6main.c
@@ -2158,9 +2158,15 @@ static int raid6_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
                 /* no point adding a device */
                 return 0;
         /*
-         * find the disk ...
+         * find the disk ... but prefer rdev->saved_raid_disk
+         * if possible.
          */
-        for (disk=0; disk < mddev->raid_disks; disk++)
+        if (rdev->saved_raid_disk >= 0 &&
+            conf->disks[rdev->saved_raid_disk].rdev == NULL)
+                disk = rdev->saved_raid_disk;
+        else
+                disk = 0;
+        for ( ; disk < mddev->raid_disks; disk++)
                 if ((p=conf->disks + disk)->rdev == NULL) {
                         clear_bit(In_sync, &rdev->flags);
                         rdev->raid_disk = disk;