linux-kernel - Re: Changes to sysfs PM layer break userspace

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Message-Id: <1166561743.3365.1282.camel@laptopd505.fenrus.org>
Date:	Tue, 19 Dec 2006 21:55:43 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	linux-kernel@...r.kernel.org, david-b@...bell.net, gregkh@...e.de
Subject: Re: Changes to sysfs PM layer break userspace

On Tue, 2006-12-19 at 20:32 +0000, Matthew Garrett wrote:
> On Tue, Dec 19, 2006 at 09:23:05PM +0100, Arjan van de Ven wrote:
> > On Tue, 2006-12-19 at 20:08 +0000, Matthew Garrett wrote:
> > > I'm not sure. Suspending the chip means you lose things like link beat 
> > > detection, so it's not something you necessarily want to automatically 
> > > tie to something like interface status. 
> > 
> > right now the "spec" for Linux network drivers assumes that you put the
> > NIC into D3 on down, except for cases where Wake-on-Lan is enabled etc.
> 
> Really? I can't find any drivers that seem to do this. The only calls to 
> pci_set_power_state seem to be in the suspend, resume, init and exit 
> routines.

your grep missed tg3.c for example, which has a wrapper around the power
state code and goes to D3hot on downing of the interface. (just the
first one I looked at as a "reference driver", others probably do the
same thing)

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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