> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/mm.h>
> +#include <linux/of_pci.h>
> +#include <linux/of_platform.h>
> +#include <linux/slab.h>
> +
> +#include <asm/pci-bridge.h>
> +
> +
> +/*
> + * Return the domain number for this bus
> + */
> +int pci_domain_nr(struct pci_bus *bus)
> +{
> +     struct pci_host_bridge *bridge = to_pci_host_bridge(bus->bridge);

Here bus is specific to root bus ? or, what about use find_pci_host_bridge() to 
get the pci_host_bridge
instead.

> +
> +     if (bridge)
> +             return bridge->domain_nr;
> +
> +     return 0;
> +}
> +
> +int pci_proc_domain(struct pci_bus *bus)
> +{
> +     return pci_domain_nr(bus);
> +}
> +
> +/*
> + * Called after each bus is probed, but before its children are examined
> + */
> +void pcibios_fixup_bus(struct pci_bus *bus)
> +{
> +     struct pci_dev *dev;
> +     struct resource *res;
> +     int i;
> +
> +     if (bus->self != NULL) {

What about use !pci_is_root_bus() ?

> +             pci_read_bridge_bases(bus);
> +
> +             pci_bus_for_each_resource(bus, res, i) {
> +                     if (!res || !res->flags || res->parent)
> +                             continue;
> +
> +                     /*
> +                      * If we are going to reassign everything, we can
> +                      * shrink the P2P resource to have zero size to
> +                      * save space
> +                      */
> +                     if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) {
> +                             res->flags |= IORESOURCE_UNSET;
> +                             res->start = 0;
> +                             res->end = -1;
> +                             continue;
> +                     }
> +             }
> +     }
> +

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