linux-kernel - Re: [RFD] Automatic suspend

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Date:	Mon, 16 Feb 2009 08:06:13 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

Am Monday 16 February 2009 03:20:12 schrieb Arjan van de Ven:
> >or
> > network or similar where the driver cannot shut the device down
> > without losing the ability to detect activity (ie, switch your PHY
> > off is nice but you lose the ability to monitor the link for example).
> 
> what this needs is a separation between "interface down, all off" and
> "interface down enough so that link detection works".
> Some NICs can go all the way down and still do link detection, others
> cannot. This is obviously something the driver will know, nothing else
> in the system should know.

Why shouldn't user space know the consequences of still requesting
a service and be able to decide on that basis which services to request?

	Regards
		Oliver

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