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Subject[215/272] md: fix regression with re-adding devices to arrays with no metadata
2.6.37-stable review patch.  If anyone has any objections, please let us know.


From: NeilBrown <>

commit bf572541ab44240163eaa2d486b06f306a31d45a upstream.

Commit 1a855a0606 (2.6.37-rc4) fixed a problem where devices were
re-added when they shouldn't be but caused a regression in a less
common case that means sometimes devices cannot be re-added when they
should be.

In particular, when re-adding a device to an array without metadata
we should always access the device, but after the above commit we

This patch sets the In_sync flag in that case so that the re-add

This patch is suitable for any -stable kernel to which 1a855a0606 was

Signed-off-by: NeilBrown <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/md/md.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5159,9 +5159,10 @@ static int add_new_disk(mddev_t * mddev,
/* set saved_raid_disk if appropriate */
if (!mddev->persistent) {
if (info->state & (1<<MD_DISK_SYNC) &&
- info->raid_disk < mddev->raid_disks)
+ info->raid_disk < mddev->raid_disks) {
rdev->raid_disk = info->raid_disk;
- else
+ set_bit(In_sync, &rdev->flags);
+ } else
rdev->raid_disk = -1;
} else

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