linux-kernel - /sys/.../power/state Re: [linux-usb-devel] error to be returned while suspended

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Message-ID: <20061008194124.GB4042@elf.ucw.cz>
Date:	Sun, 8 Oct 2006 21:41:24 +0200
From:	Pavel Machek <pavel@....cz>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	David Brownell <david-b@...bell.net>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: /sys/.../power/state Re: [linux-usb-devel] error to be returned while suspended

Hi!

> > > The power management functions without 
> > > timeout are also exported. For other power control features like
> > > cpu frequency considerable effort has been made to export them to
> > > user space.
> > 
> > Yes, and many of us use the much lighter weight kernel based control
> > models by preference.   Why waste hundreds of Kbytes of userspace for
> > a daemon when a few hundred bytes of kernel code can implement a
> > better and more reactive kernel policy for cpufreq?
> 
> That's an important aspect. How about implementing autosuspend
> first and keeping the sysfs-based suspension for now? If autosuspend

Current sysfs-based suspension allows people to do bad stuff to
drivers, like confusing them, oopsing them, etc. It is so broken that
it can not be fixed. (When I suspend my USB this way, I end up with
dead USB. When I suspend my sound card, I get any soundcard users in
unrecoverable D state.)

Now... you can prove me wrong, but that likely means auditing all the
drivers with suspend() and/or resume() methods. I'm not prepared to do
that work... are you?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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