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

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

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

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