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

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Message-Id: <200612282127.46504.david-b@pacbell.net>
Date:	Thu, 28 Dec 2006 21:27:45 -0800
From:	David Brownell <david-b@...bell.net>
To:	Alan <alan@...rguk.ukuu.org.uk>
Cc:	Pavel Machek <pavel@...e.cz>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: Changes to PM layer break userspace

On Thursday 28 December 2006 5:31 am, Alan wrote:
> > Seems to me anyone really desperate to put PCI devices into a low
> > power mode, without driver support at the "ifdown" level, would be
> > able just "rmmod driver; setpci".  
> 
> Incorrect for very obvious reasons - there may be two devices driven by
> the same driver one up and one down.

Let me emphasize "desperate".  ;)

The examples given were all cases where that didn't seem to be an issue.

But agreed, the best approach is really to make devices not in active
use (i.e. before "ifup", after "ifdown" ... maybe even whenever no
driver is bound to the device) stay in low power states.

- Dave
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