linux-kernel - Re: NAK new drivers without proper power management?

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Message-ID: <20070211232105.GG15445@elf.ucw.cz>
Date:	Mon, 12 Feb 2007 00:21:05 +0100
From:	Pavel Machek <pavel@....cz>
To:	Nigel Cunningham <nigel@...el.suspend2.net>
Cc:	Alan <alan@...rguk.ukuu.org.uk>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: NAK new drivers without proper power management?

Hi!

> > > > define .suspend that will always return -ENOSYS (then people will know they
> > > > have to unload the driver before the suspend).  Similarly, if you aren't sure
> > > > whether or not the device requires .suspend and .resume, define .suspend that
> > > > will always return -ENOSYS."
> > > 
> > > Sounds ok to me. Where should this text go?
> > > Documentation/SubmittingDrivers ?
> > 
> > And testing/submitting drivers, perhaps with additional text in that to
> > make it clear we want suspend/resume support or good excuses
> > 
> > "Please verify your driver correctly handles suspend and resume. If it
> > does not your patch submission is likely to be suspended and only resume
> > when the driver correctly handles this feature"
> 
> Maybe make it explicit that testing should be done for both suspend to
> ram and to disk, and with the following usage scenarios as
 > applicable?

Well, for many people s2ram does not work even today... so requiring
them to test it is slightly draconian.

> - built in;
> - modular, loaded while suspending but not loaded prior to resume from
> disk;

These two should be equivalent.

> - modular, loaded while suspending and loaded prior to resume from disk;

Ok.. but I'm not sure how many people will actually test it _that_
thoroughly. "Try to test it" is good enough for a first version. When
suspend is in better shape, we can ask for more.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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