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

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Message-Id: <200702120016.18480.rjw@sisk.pl>
Date:	Mon, 12 Feb 2007 00:16:17 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	nigel@...el.suspend2.net
Cc:	Alan <alan@...rguk.ukuu.org.uk>, Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: NAK new drivers without proper power management?

On Monday, 12 February 2007 00:10, Nigel Cunningham wrote:
> Hi.
> 
> On Sun, 2007-02-11 at 21:02 +0000, Alan wrote:
> > > > "If the device requires that, implement .suspend and .resume or at least
> > > > 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?
> 
> - built in;
> - modular, loaded while suspending but not loaded prior to resume from
> disk;
> - modular, loaded while suspending and loaded prior to resume from disk;

I think we should state the general rule in Documentation/SubmittingDrivers
and give more details in Documentation/power/devices.txt

Greetings,
Rafael
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