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

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Message-ID: <20091116210545.GA29696@srcf.ucam.org>
Date:	Mon, 16 Nov 2009 21:05:45 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Oliver Neukum <oliver@...kum.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>
Subject: Re: [RFC][PATCH 1/10] PM: Add flag for devices capable of
	generating run-time wake-up events

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?

> > > 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.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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