linux-kernel - Re: [PATCH v4 02/13] libata: bind the Linux device tree to the ACPI device tree

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Date:	Thu, 14 Jun 2012 15:43:57 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Aaron Lu <aaron.lu@....com>, Holger Macht <holger@...ac.de>,
	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v4 02/13] libata: bind the Linux device tree to the ACPI
 device tree

On Wed, Jun 13, 2012 at 7:00 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Wed, 13 Jun 2012 16:03:23 +0800
> Lin Ming <ming.m.lin@...el.com> wrote:
>
>> On Mon, May 28, 2012 at 5:51 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
>> >> +static int is_pci_ata(struct device *dev)
>> >> +{
>> >> +     struct pci_dev *pdev;
>> >> +
>> >> +     if (!is_pci_dev(dev))
>> >> +             return 0;
>> >> +
>> >> +     pdev = to_pci_dev(dev);
>> >> +
>> >> +     if ((pdev->class >> 8) != PCI_CLASS_STORAGE_SATA &&
>> >> +         (pdev->class >> 8) != PCI_CLASS_STORAGE_IDE)
>> >> +             return 0;
>> >
>> > This needs a better name. It doesn't check if a device is PCI ATA or
>> > anything of the sort, it checks if its probably a device in compatibility
>> > mode. A lot of controllers will in fact report RAID class or similar in
>> > native mode.
>>
>> How about compat_pci_ata?
>
> Sounds reasonable. I'm not btw sure the test is entirely right, but I'm
> not sure quite what you are trying to figure out from it and how ACPI
> expects this mapping to work.

It's used to figure out if the dev passed in from scsi layer is a ata device.

scsi_sysfs_add_sdev
device_add
acpi_platform_notify
ata_acpi_find_device
is_pci_ata

Thanks,
Lin Ming

>
> Alan
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