linux-kernel - Re: [linux-pm] [RFC] PCI: Runtime power management

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Message-Id: <200908152344.46898.rjw@sisk.pl>
Date:	Sat, 15 Aug 2009 23:44:46 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	linux-pci@...r.kernel.org, Greg KH <gregkh@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Subject: Re: [linux-pm] [RFC] PCI: Runtime power management

On Saturday 15 August 2009, Matthew Garrett wrote:
> On Sat, Aug 15, 2009 at 11:21:53PM +0200, Rafael J. Wysocki wrote:
> 
> > I can even imagine a scenario where this setting might be useful, like when
> > we don't want a network adapter to be woken up from the outside.
> 
> I think in that case we'd probably just want the interface to be downed? 
> Some of this is going to require device-specific policy, I think - for 
> the network case we probably want something in between IF_RUNNING and 
> IF_DOWN (IF_CARRIER, perhaps) that indicates that we want the PHY to be 
> powered. Pushing this out to sysfs would mean we'd have a consistent 
> interface but varying semantics, and I'm not convinced that's an 
> especially helpful interface.

I'm not disagreeing with that.

At this point I'd like to know the Alan's opinion.  I would gladly use the
'runtime_forbidden' flag only, but if we overlook something now, it's going
to be difficult to fix later.

Thanks,
Rafael
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