tree 7f75b60c3a010e5699e43b38853fbd33f85d9267
parent 3682a3946d2b0bad621db871e3bead83e523a238
author Myron Stowe <mstowe@redhat.com> 1321901647 -0700
committer Jesse Barnes <jbarnes@virtuousgeek.org> 1329237885 -0800

PCI: Fix starting basis for resource requests

pci_revert_fw_address() is used to reinstate a PCI device's original
FW-assigned BIOS BAR value(s) if normal resource assignment fails.

When attempting to reinstate an address, the point within the resource
tree from which to attempt the new resource request should be the parent
resource corresponding to the device, not the base of the resource tree
(ioport_resource or iomem_resource).  For PCI devices this would
typically be the resource corresponding to the upstream PCI host bridge
or P2P bridge aperture.

This patch sets the point within the resource tree to attempt a new
resource assignment request to the PCI device's parent resource and only
if that fails does it fall back to the base ioport_resource or
iomem_resource.

Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>