linux-kernel - Re: [PATCH] Add SIMPLE_PM_OPS: make switching to dev_pm

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Message-Id: <200908052047.26293.rjw@sisk.pl>
Date:	Wed, 5 Aug 2009 20:47:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Frans Pop <elendil@...net.nl>, linux-kernel@...r.kernel.org,
	Linux PM List <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] Add SIMPLE_PM_OPS: make switching to dev_pm_ops less error-prone

On Wednesday 05 August 2009, Albin Tonnerre wrote:
> On Tue, Aug 04, 2009 at 09:55:33PM -0700, Dmitry Torokhov wrote :
> > On Tue, Aug 04, 2009 at 11:36:12AM +0200, Albin Tonnerre wrote:
> > > In a number of cases, the .suspend, .freeze, .poweroff and .resume,
> > > .thaw, .restore functions are identical. However, they all need to be
> > > assigned to avoid regressionsm as the previous code called .suspend
> > > resp. .resume in all those cases. SIMPLE_PM_OPS allows to deal with
> > > this case.
> 
> 
> > I'd much rather have conversions done with a bit more analysis now that
> > our framework is more flexible and we can have specialized routines for
> > hibernation and suspend.
> 
> I still think that even though they can, quite a number of drivers won't
> /need/ to have different functions for this, but maybe I'm mistaken.
> 
> > Maybe we should try changing from run-time to build time warning so that
> > users are not overly concerned with it?
> 
> I'm not sure that solves the problem. The fact is that even for developers, it's
> easy to overlook that assiging only the .suspend and .resume fields is probably
> a mistake.

I agree, so I'm going to take the patch.

I'll add a comment describing what the macro is for, though.

Thanks,
Rafael
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