Re: [PATCH v3] PCI: Only enable IO window if supported

[Yinghai Lu]

On Wed, Aug 5, 2015 at 9:50 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> If I understand you correctly, we might need to change the code
> in pci_read_bridge_io() as follows.
>
> From
>
>         if (!(child->bus_flags & PCI_BUS_FLAGS_SUPPORTS_IO))
>                 return;
>
> to something like
>
>         if (!(child->bus_flags & PCI_BUS_FLAGS_SUPPORTS_IO)) {
>                 if (dev->transparent)
>                         return;
>                 child->bus_flags |= PCI_BUS_FLAGS_SUPPORTS_IO;
>         }
>
Then how about: the root bus really does not support IO PORT resource.
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