linux-kernel - Re: [PATCH] ACPI : Dummy acpi_video_register should return error code

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Date:	Mon, 04 Jul 2016 15:01:18 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Aaron Lu <aaron.lu@...el.com>,
	Arvind Yadav <arvind.yadav.cs@...il.com>
Cc:	robert.moore@...el.com, lv.zheng@...el.com,
	rafael.j.wysocki@...el.com, lenb@...nel.org,
	linux-acpi@...r.kernel.org, devel@...ica.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI : Dummy acpi_video_register should return error code

On Thursday, June 23, 2016 09:35:01 AM Aaron Lu wrote:
> On 06/23/2016 05:05 AM, Rafael J. Wysocki wrote:
> > On Thursday, June 23, 2016 12:26:01 AM Arvind Yadav wrote:
> >> The inline acpi_video_register stub simply allows compilation on systems
> >> with CONFIG_ACPI_VIDEO disabled. the dummy acpi_video_register does not
> >> register an acpi_bus_driver at all. The inline acpi_video_register should
> >> return to indicate lack of support when attempting to register an
> >> acpi_bus_driver on such a system with CONFIG_ACPI_VIDEO disabled.
> >>
> >> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> >> ---
> >>  include/acpi/video.h | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/include/acpi/video.h b/include/acpi/video.h
> >> index 5731ccb..4536bd3 100644
> >> --- a/include/acpi/video.h
> >> +++ b/include/acpi/video.h
> >> @@ -54,7 +54,7 @@ extern int acpi_video_get_levels(struct acpi_device *device,
> >>  				 struct acpi_video_device_brightness **dev_br,
> >>  				 int *pmax_level);
> >>  #else
> >> -static inline int acpi_video_register(void) { return 0; }
> >> +static inline int acpi_video_register(void) { return -ENODEV; }
> >>  static inline void acpi_video_unregister(void) { return; }
> >>  static inline int acpi_video_get_edid(struct acpi_device *device, int type,
> >>  				      int device_id, void **edid)
> > 
> > Aaron, what do you think?
>  
> The only place that cares about the return value of acpi_video_register
> is in acpi_video_init where CONFIG_ACPI_VIDEO must be defined, all other
> places do not care about the return value so this change shouldn't cause
> any problems and returning -ENODEV sounds more reasonable than 0 here.
> 
> Reviewed-by: Aaron Lu <aaron.lu@...el.com>

Patch applied, thanks!