From: Liu Jinsong <jinsong.liu@intel.com>
Date: Sat, 16 Feb 2013 08:59:03 +0000 (+0800)
Subject: xen/acpi: xen memory hotplug minor updates
X-Git-Tag: v3.9-rc1~2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=484400ffbf2dd33446d71c05b9cddf91932a882e;p=pandora-kernel.git

xen/acpi: xen memory hotplug minor updates

Dan Carpenter found current xen memory hotplug logic
has potential issue: at func acpi_memory_get_device()
*mem_device = acpi_driver_data(device);
while the device may be NULL and then dereference.

At native side, Rafael recently updated acpi_memory_get_device(),
dropping acpi_bus_add, adding lock, and avoiding above issue.

This patch updates xen memory hotplug logic accordingly, removing
redundant logic, adding lock, and avoiding dereference.

Signed-off-by: Liu Jinsong <jinsong.liu@intel.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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