[PATCH v13 10/12] PCI: Assign unassigned bus resources in pci_scan_root_bus()

[Yinghai Lu]

On Mon, Sep 29, 2014 at 7:29 AM, Liviu Dudau <Liviu.Dudau at arm.com> wrote:
> If the firmware has not assigned all the bus resources and we are not just
> probing the PCI buses, it makes sense to assign the unassigned resources
> in pci_scan_root_bus().
>
> Signed-off-by: Liviu Dudau <Liviu.Dudau at arm.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
> CC: Arnd Bergmann <arnd at arndb.de>
> CC: Jason Gunthorpe <jgunthorpe at obsidianresearch.com>
> CC: Rob Herring <robh+dt at kernel.org>
> ---
>  drivers/pci/probe.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 636d1c9..d2ebd49 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1951,6 +1951,9 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
>         if (!found)
>                 pci_bus_update_busn_res_end(b, max);
>
> +       if (!pci_has_flag(PCI_PROBE_ONLY))
> +               pci_assign_unassigned_bus_resources(b);
> +
>         pci_bus_add_devices(b);
>         return b;
>  }

No, you can not do it that early.

On x86, we need to call
pcibios_resource_survey_bus at first.

Thanks

Yinghai