linux-kernel - Re: [PATCH 2/3] PCI: correctly detect ACPI PCI host bridge objects

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Message-ID: <CAE9FiQU8Tt4yF40AnaGS_Ompt1LYHe-fupkNY1SRyp+3BTjg6w@mail.gmail.com>
Date:	Fri, 26 Oct 2012 11:13:50 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	linux-kernel@...r.kernel.org, Jiang Liu <jiang.liu@...wei.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/3] PCI: correctly detect ACPI PCI host bridge objects

On Fri, Oct 26, 2012 at 2:10 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Thu, Oct 18, 2012 at 2:50 PM, Yinghai Lu <yinghai@...nel.org> wrote:
>>
>> +static const struct acpi_device_id root_device_ids[] = {
>> +       {"PNP0A03", 0},
>> +       {"PNP0A08", 0},
>
> Why do we need PNP0A08 here?
>
> Per the PCI Firmware Spec, sec 4.1.5, PNP0A08 identifies a PCI Express
> or a PCI-X Mode 2 host bridge, and such a device is required to
> include PNP0A03 in _CID.  Therefore, it should be sufficient to look
> only for PNP0A03.

good, I removed that line and updated for-pci-split-pci-root-hp-2 branch.

Thanks

Yinghai
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