From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Garrett <mjg59@srcf.ucam.org>
Subject: Re: [RFC][PATCH 1/10] PM: Add flag for devices capable of
	generating run-time wake-up events
Date: Mon, 16 Nov 2009 21:05:45 +0000
Message-ID: <20091116210545.GA29696@srcf.ucam.org>
References: <200911162152.38333.rjw@sisk.pl> <Pine.LNX.4.44L0.0911161557130.2971-100000@iolanthe.rowland.org>
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To: Alan Stern <stern@rowland.harvard.edu>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, pm list <linux-pm@lists.linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, Linux PCI <linux-pci@vger.kernel.org>, ACPI Devel Maling List <linux-acpi@vger.kernel.org>, Jesse Barnes <jbarnes@virtuousgeek.org>, Oliver Neukum <oliver@neukum.org>, Shaohua Li <shaohua.li@intel.com>, Bjorn Helgaas <bjorn.helgaas@hp.com>
List-Id: linux-acpi@vger.kernel.org

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@srcf.ucam.org