linux-kernel - Re: [RFC PATCH 1/3] MIPS: PCI: Use pci_bus_remove_resources()/pci_bus_add

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Date:	Wed, 24 Aug 2011 08:35:19 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Deng-Cheng Zhu <dengcheng.zhu@...il.com>
Cc:	jbarnes@...tuousgeek.org, ralf@...ux-mips.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org, eyal@...s.com, zenon@...s.com
Subject: Re: [RFC PATCH 1/3] MIPS: PCI: Use pci_bus_remove_resources()/pci_bus_add_resource()
 to set up root resources

On Wed, Aug 24, 2011 at 12:24 AM, Deng-Cheng Zhu
<dengcheng.zhu@...il.com> wrote:
> Use this new style (instead of filling in the pci_bus->resource[] array
> directly) to hide some ugly implementation details.
>
> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@...il.com>
> ---
>  arch/mips/pci/pci.c |   11 +++++++++--
>  1 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
> index 33bba7b..7473214 100644
> --- a/arch/mips/pci/pci.c
> +++ b/arch/mips/pci/pci.c
> @@ -261,6 +261,14 @@ static void pcibios_fixup_device_resources(struct pci_dev *dev,
>        }
>  }
>
> +static void __devinit
> +pcibios_setup_root_resources(struct pci_bus *bus, struct pci_controller *ctrl)
> +{
> +       pci_bus_remove_resources(bus);
> +       pci_bus_add_resource(bus, ctrl->io_resource, 0);
> +       pci_bus_add_resource(bus, ctrl->mem_resource, 0);
> +}
> +
>  void __devinit pcibios_fixup_bus(struct pci_bus *bus)
>  {
>        /* Propagate hose info into the subordinate devices.  */
> @@ -270,8 +278,7 @@ void __devinit pcibios_fixup_bus(struct pci_bus *bus)
>        struct pci_dev *dev = bus->self;
>
>        if (!dev) {
> -               bus->resource[0] = hose->io_resource;
> -               bus->resource[1] = hose->mem_resource;
> +               pcibios_setup_root_resources(bus, hose);
>        } else if (pci_probe_only &&
>                   (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
>                pci_read_bridge_bases(bus);

I don't understand this patch.

Wouldn't it be enough to have [PATCH 2/3], which adds the
pci_create_bus() argument with nobody using it yet, then [PATCH 3/3],
which makes mips supply the new argument, and add a hunk to [PATCH
3/3] that completely removes the bus->resource fixups in
pcibios_fixup_bus() at the same time?

Bjorn
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