[patch 56/67] MD: Fix problem where hot-added drives are not resynced.

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Neil Brown <neilb@xxxxxxx>

If a drive is added with HOT_ADD_DISK rather than ADD_NEW_DISK,
saved_raid_disk isn't initialised properly, and the drive can be
included in the array without a resync.


From: Neil Brown <neilb@xxxxxxx>
Cc: <syrius.ml@xxxxxxxxxx>
Cc: Richard Bollinger <rabollinger@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/md/md.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-2.6.18.orig/drivers/md/md.c
+++ linux-2.6.18/drivers/md/md.c
@@ -3867,6 +3867,7 @@ static int hot_add_disk(mddev_t * mddev,
 	}
 	clear_bit(In_sync, &rdev->flags);
 	rdev->desc_nr = -1;
+	rdev->saved_raid_disk = -1;
 	err = bind_rdev_to_array(rdev, mddev);
 	if (err)
 		goto abort_export;

--
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