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PCI: add pci_scan_root_bus() that accepts resource list
"Early" and "header" quirks often use incorrect bus resources because they
see the default resources assigned by pci_create_bus(), before the
architecture fixes them up (typically in pcibios_fixup_bus()). Regions
reserved by these quirks end up with the wrong parents.
Here's the standard path for scanning a PCI root bus:
pci_scan_bus or pci_scan_bus_parented
pci_create_bus <-- A create with default resources
pci_scan_child_bus
pci_scan_slot
pci_scan_single_device
pci_scan_device
pci_setup_device
pci_fixup_device(early) <-- B
pci_device_add
pci_fixup_device(header) <-- C
pcibios_fixup_bus <-- D fill in correct resources
Early and header quirks at B and C use the default (incorrect) root bus
resources rather than those filled in at D.
This patch adds a new pci_scan_root_bus() function that sets the bus
resources correctly from a supplied list of resources.
I intend to remove pci_scan_bus() and pci_scan_bus_parented() after
fixing all callers.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>