From: NeilBrown <neilb@suse.de>
Date: Wed, 16 Feb 2011 02:58:51 +0000 (+1100)
Subject: md: correctly handle probe of an 'mdp' device.
X-Git-Tag: v2.6.38-rc7~34^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d;p=pandora-kernel.git

md: correctly handle probe of an 'mdp' device.

'mdp' devices are md devices with preallocated device numbers
for partitions. As such it is possible to mknod and open a partition
before opening the whole device.

this causes  md_probe() to be called with a device number of a
partition, which in-turn calls mddev_find with such a number.

However mddev_find expects the number of a 'whole device' and
does the wrong thing with partition numbers.

So add code to mddev_find to remove the 'partition' part of
a device number and just work with the 'whole device'.

This patch addresses https://bugzilla.kernel.org/show_bug.cgi?id=28652

Reported-by: hkmaly@bigfoot.com
Signed-off-by: NeilBrown <neilb@suse.de>
Cc: <stable@kernel.org>
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