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md: Fix removal of extra drives when converting RAID6 to RAID5

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commit bf2cb0dab8c97f00a71875d9b13dbac17a2f47ca upstream.

When a RAID6 is converted to a RAID5, the extra drive should
be discarded.  However it isn't due to a typo in a comparison.

This bug was introduced in commit e93f68a1fc6 in 2.6.35-rc4
and is suitable for any -stable since than.

As the extra drive is not removed, the 'degraded' counter is wrong and
so the RAID5 will not respond correctly to a subsequent failure.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
NeilBrown 2011-01-14 09:14:34 +11:00 committed by Greg Kroah-Hartman
parent 2758704d68
commit 9d175349c0
1 changed files with 1 additions and 1 deletions
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2
drivers/md/md.c
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@ -3117,7 +3117,7 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
char nm[20];
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk > mddev->raid_disks)
if (rdev->new_raid_disk >= mddev->raid_disks)
rdev->new_raid_disk = -1;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;