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

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 e93f68a1fc 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.

Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
hifive-unleashed-5.1
NeilBrown 2011-01-14 09:14:34 +11:00
parent ba1b41b6b4
commit bf2cb0dab8
1 changed files with 1 additions and 1 deletions
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2
drivers/md/md.c
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@ -3126,7 +3126,7 @@ 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;