From: NeilBrown <neilb@suse.de>
Date: Mon, 15 Dec 2014 01:56:59 +0000 (+1100)
Subject: md/raid5: use ->lock to protect accessing raid5 sysfs attributes.
X-Git-Tag: fixes-v4.0-rc1~120^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b1485bab9c49b0d3811d72beb0de60c7b8b337d;p=pandora-kernel.git

md/raid5: use ->lock to protect accessing raid5 sysfs attributes.

It is important that mddev->private isn't freed while
a sysfs attribute function is accessing it.

So use mddev->lock to protect the setting of ->private to NULL, and
take that lock when checking ->private for NULL and de-referencing it
in the sysfs access functions.

This only applies to the read ('show') side of access.  Write
access will be handled separately.

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