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

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Message-Id: <1171312688.4081.9.camel@nigel.suspend2.net>
Date:	Tue, 13 Feb 2007 07:38:08 +1100
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Pavel Machek <pavel@....cz>, "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.

On Mon, 2007-02-12 at 16:57 +0100, Geert Uytterhoeven wrote:
> On Mon, 12 Feb 2007, Pavel Machek wrote:
> > > Can't the upper layer just assume -ENOSYS if .resume/.suspend is NULL?
> > > It's nicer if you don't have to implement dummy functions at all.
> > 
> > Unfortunately, drivers currently assume "NULL == nothing is needed",
> > so we'd have t do big search & replace... 
> 
> Which means you also cannot easily keep track of which driver supports
> suspend/resume and which doesn't, as there will always be drivers where a
> missing suspend/resume function is correct.
> 
> Wouldn't it be more sensible to have
> 
>     .suspend = suspend_nothing_to_do
> 
> instead, and reserve NULL for `not yet implemented'?

Agreed.

Regards,

Nigel

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