Re: [RFC][PATCH 1/10] PM: Add flag for devices capable of generatingrun-time wake-up events

[Alan Stern]

On Mon, 16 Nov 2009, Matthew Garrett wrote:

> On Mon, Nov 16, 2009 at 04:00:49PM -0500, Alan Stern wrote:
> > On Mon, 16 Nov 2009, Rafael J. Wysocki wrote:
> > > Yes, in general.  The platform.
> > 
> > And for non-platform devices (hot-pluggable, for example)?  Presumably 
> > you would want the driver that detects and registers the device to set 
> > this flag.
> 
> Are there any cases where the bus code won't know this?

None that I'm aware of.  I merely wanted to clarify where the flag was 
supposed to get set.

> > > > What if the kernel can't tell whether or not the device can generate 
> > > > runtime wake-up events?
> > > 
> > > Do you have any specific examples in mind?
> > 
> > What about Matthew's example of an ACPI GPE which might or might not 
> > cause a runtime wake-up event, depending on the AML code in the BIOS?
> 
> The platform knows whether or not that's the case.

Okay, then it isn't a problem.  Except perhaps in the case of buggy 
devices which _should_ generate these events but don't.

Alan Stern

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