Re: [PATCH V11 07/17] powerpc/pci: Don't unset pci resources for VFs

[Benjamin Herrenschmidt <benh@au1.ibm.com>]

On Thu, 2015-01-15 at 10:27 +0800, Wei Yang wrote:
> If we're going to reassign resources with flag PCI_REASSIGN_ALL_RSRC, all
> resources will be cleaned out during device header fixup time and then get
> reassigned by PCI core. However, the VF resources won't be reassigned and
> thus, we shouldn't clean them out.
> 
> This patch adds a condition. If the pci_dev is a VF, skip the resource
> unset process.

I don't understand this, can you elaborate ? Why wouldn't we reassign
the IOV resource just like everything else ?

Ben.

> Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
> ---
>  arch/powerpc/kernel/pci-common.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
> index 37d512d..889f743 100644
> --- a/arch/powerpc/kernel/pci-common.c
> +++ b/arch/powerpc/kernel/pci-common.c
> @@ -788,6 +788,10 @@ static void pcibios_fixup_resources(struct pci_dev *dev)
>  		       pci_name(dev));
>  		return;
>  	}
> +
> +	if (dev->is_virtfn)
> +		return;
> +
>  	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
>  		struct resource *res = dev->resource + i;
>  		struct pci_bus_region reg;