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

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Date:	Mon, 16 Nov 2009 14:39:03 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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 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?

What if the kernel can't tell whether or not the device can generate 
runtime wake-up events?

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

Alan Stern

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