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

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Message-ID: <CAE9FiQVDwX_-bX9sH2qv3thkKzOosFR3WvkUYWM=TsU-4oOSzA@mail.gmail.com>
Date:	Thu, 6 Aug 2015 08:58:40 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v3] PCI: Only enable IO window if supported

On Wed, Aug 5, 2015 at 9:50 PM, Guenter Roeck <linux@...ck-us.net> 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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