On Wed, Jun 13, 2012 at 7:00 PM, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 13 Jun 2012 16:03:23 +0800
> Lin Ming <ming.m.lin@xxxxxxxxx> wrote:
>
>> On Mon, May 28, 2012 at 5:51 PM, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> 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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