Re: RFC: ACPI/scsi/libata integration and hotswap

Alan Cox
2005-12-08T14:03:02Z

On Iau, 2005-12-08 at 13:39 +0000, Matthew Garrett wrote:
> On Thu, Dec 08, 2005 at 01:33:08PM +0000, Christoph Hellwig wrote:
>
> > Don't do it at all. We don't need to fuck up every layer and driver for
> > intels braindamage.
>
> Doing SATA suspend/resume properly on x86 depends on knowing the ACPI
> object that corresponds to a host or target. It's also the only way to
> support hotswap on this hardware[1], since there's no way for userspace
> to know which device a notification refers to.
>
> [1] ie, most laptops sold nowadays

Actually "most PC systems"

Nevertheless Christoph has a point even if its hidden behind a George
Bush approach to diplomacy. The scsi core directly shouldn't need to
know about ACPI or other arch specific PM systems.

Something like "pci_to_acpi(struct pcidev *)" belongs in arch specific
code even if we do add a generic "void * pm_device" type pointer to
struct pci_dev or struct device for such a purpose.

Alan