linux-kernel - Re: [PATCH v3 1/4] platform/x86: fujitsu-laptop: register backlight device in a separate function

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Message-ID: <20170310090849.GA13521@ozzy.nask.waw.pl>
Date:   Fri, 10 Mar 2017 10:08:49 +0100
From:   Michał Kępień <kernel@...pniu.pl>
To:     Jonathan Woithe <jwoithe@...t42.net>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] platform/x86: fujitsu-laptop: register backlight
 device in a separate function

> Move code responsible for backlight device registration to a separate
> function in order to simplify error handling and decrease indentation.
> Simplify initialization of struct backlight_properties.  Use
> KBUILD_MODNAME as device name to avoid repeating the same string literal
> throughout the module.
> 
> Signed-off-by: Michał Kępień <kernel@...pniu.pl>
> ---
>  drivers/platform/x86/fujitsu-laptop.c | 38 ++++++++++++++++++++---------------
>  1 file changed, 22 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> index e12cc3504d48..185c929898d9 100644
> --- a/drivers/platform/x86/fujitsu-laptop.c
> +++ b/drivers/platform/x86/fujitsu-laptop.c
> @@ -685,6 +685,25 @@ static const struct dmi_system_id fujitsu_dmi_table[] __initconst = {
>  
>  /* ACPI device for LCD brightness control */
>  
> +static int fujitsu_backlight_register(void)
> +{
> +	struct backlight_properties props = {
> +		.brightness = fujitsu_bl->brightness_level,
> +		.max_brightness = fujitsu_bl->max_brightness - 1,
> +		.type = BACKLIGHT_PLATFORM
> +	};
> +	struct backlight_device *bd;
> +
> +	bd = backlight_device_register(KBUILD_MODNAME, NULL, NULL,
> +				       &fujitsu_bl_ops, &props);

I have only just now noticed that this effectively breaks userspace
interface as KBUILD_MODNAME is "fujitsu_laptop" while the previously
used device name was "fujitsu-laptop" (underscore vs. hyphen).

Jonathan, as this series is already long overdue, I suggest the
following course of action: please review these patches anyway and if
you find no other issues, please provide your Reviewed-by etc. as you
normally would.  Once you do that, I will post v4 which will use
"fujitsu-laptop" for backlight device name and will contain your v3
review tags.  Does that sound reasonable?

-- 
Best regards,
Michał Kępień