From: Alex Williamson <alex.williamson@redhat.com>
Date: Wed, 27 Aug 2014 19:01:35 +0000 (-0600)
Subject: radeon: Test for PCI root bus before assuming bus->self
X-Git-Tag: omap-fixes-against-v3.17-rc3~38^2~5^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bd252de78d406485c896508c13a8f7a78ee8353;p=pandora-kernel.git

radeon: Test for PCI root bus before assuming bus->self

If we assign a Radeon device to a virtual machine, we can no longer
assume a fixed hardware topology, like the GPU having a parent device.
This patch simply adds a few pci_is_root_bus() tests to avoid passing
a NULL pointer to PCI access functions, allowing the radeon driver to
work in a QEMU 440FX machine with an assigned HD8570 on the emulated
PCI root bus.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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