From a83919e0940f6eb8f77ab1d602a063f8a6703117 Mon Sep 17 00:00:00 2001
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Date: Fri, 10 Jan 2014 15:29:19 +0100
Subject: [PATCH] xen/pcifront: Use global PCI rescan-remove locking

Multiple race conditions are possible between the Xen pcifront device
addition and removal and the generic PCI device addition and removal that
can be triggered via sysfs.

To avoid those race conditions make the Xen pcifront code use global PCI
rescan-remove locking.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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