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

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Date:	Wed, 13 Jun 2012 12:00:50 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Lin Ming <ming.m.lin@...el.com>
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, 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.

Alan
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