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: <200911162152.38333.rjw@sisk.pl>
Date:	Mon, 16 Nov 2009 21:52:38 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	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>,
	Matthew Garrett <mjg59@...f.ucam.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 Monday 16 November 2009, Alan Stern wrote:
> On Mon, 16 Nov 2009, Rafael J. Wysocki wrote:
> 
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > Apparently, there are devices that can wake up the system from sleep
> > states and yet are incapable of generating wake-up events at run
> > time.  Thus, introduce a flag indicating if given device is capable
> > of generating run-time wake-up events.
> 
> This raises the question: Who is responsible for setting the new 
> flag?  The code that registers the device?

Yes, in general.  The platform.

Actually, I needed it for PCI, but I thought it would be better to put it at
the core level.

> 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 if the user wants to override the kernel's setting?  Should there 
> be a sysfs attribute controlling the flag?

I have no plans for adding anything like that.

Rafael
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