linux-kernel - Re: error to be returned while suspended

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Message-ID: <20061005085706.GB27594@elf.ucw.cz>
Date:	Thu, 5 Oct 2006 10:57:06 +0200
From:	Pavel Machek <pavel@....cz>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	linux-kernel@...r.kernel.org, linux-usb-devel@...ts.sourceforge.net
Subject: Re: error to be returned while suspended

Hi!

> > (So we are talking runtime suspend?)
> 
> Yes. Otherwise the patch would have been ready two days ago.
> But if I am implenting this, I'll do a full implementation.
> 
> > No, I do not know what the right interface is. I started to suspect
> > that drivers should suspend/resume devices automatically, without
> > userland help. Maybe having autosuspend_timeout in sysfs is enough.
> 
> If you do this at kernel level, you'll screw up any demon implementing
> a power policy to stay within the budget.

Well, in case of machine where "must get approval before you can use
printer"... just do exactly that. Make userland ask approval of
powerbudgetd before it opens /dev/lp0.

It will only be neccessary on very small machines, anyway.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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