md: Fix removal of extra drives when converting RAID6 to RAID5
authorNeilBrown <neilb@suse.de>
Thu, 13 Jan 2011 22:14:34 +0000 (09:14 +1100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Thu, 17 Feb 2011 22:47:24 +0000 (14:47 -0800)
commit0addbdd392125780ac65bcd9dcf69eae2afb9c01
tree6b0a7272c112588486a9fb4f8a3290f9f111a189
parent7896fe54a75c5bfd8dfed08d98cb7e15896e3749
md: Fix removal of extra drives when converting RAID6 to RAID5

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>
drivers/md/md.c