From: NeilBrown <neilb@suse.de>
Date: Thu, 11 Oct 2012 03:24:13 +0000 (+1100)
Subject: md/raid5: be careful not to resize_stripes too big.
X-Git-Tag: v3.7-rc1~10^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e56108d65f8705170d238858616728359542aebb;p=pandora-kernel.git

md/raid5: be careful not to resize_stripes too big.

When a RAID5 is reshaping, conf->raid_disks is increased
before mddev->delta_disks becomes zero.
This can result in check_reshape calling resize_stripes with a
number that is too large.  This particularly happens
when md_check_recovery calls ->check_reshape().

If we use ->previous_raid_disks, we don't risk this.

Signed-off-by: NeilBrown <neilb@suse.de>
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