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

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Date:	Mon, 12 Feb 2007 09:49:50 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Pavel Machek <pavel@....cz>,
	Arjan van de Ven <arjan@...radead.org>,
	nigel@...el.suspend2.net, LKML <linux-kernel@...r.kernel.org>
Subject: Re: NAK new drivers without proper power management?

On Sat, 10 Feb 2007, Rafael J. Wysocki wrote:
> What about this:
> 
> "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."
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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