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Re: [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge set_lcd_level_alt() into set_lcd_level()

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On Fri, Apr 07, 2017 at 09:23:47PM +0930, I wrote:
> On Wed, Apr 05, 2017 at 08:49:02AM +0200, Micha?? K??pie?? wrote:
> > diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> > index 59107a599d22..2f563aa00592 100644
> > --- a/drivers/platform/x86/fujitsu-laptop.c
> > +++ b/drivers/platform/x86/fujitsu-laptop.c
> > @@ -360,41 +360,26 @@ static int set_lcd_level(int level)
> >  {
> >  	acpi_status status = AE_OK;
> >  	acpi_handle handle = NULL;
> > -
> > -	vdbg_printk(FUJLAPTOP_DBG_TRACE, "set lcd level via SBLL [%d]\n",
> > -		    level);
> > -
> > -	if (level < 0 || level >= fujitsu_bl->max_brightness)
> > -		return -EINVAL;
> > -
> > -	status = acpi_get_handle(fujitsu_bl->acpi_handle, "SBLL", &handle);
> > -	if (ACPI_FAILURE(status)) {
> > -		vdbg_printk(FUJLAPTOP_DBG_ERROR, "SBLL not present\n");
> > -		return -ENODEV;
> > +	char *method;
> > +
> > +	switch (use_alt_lcd_levels) {
> > +	case 1:
> > +		method = "SBL2";
> > +		break;
> > +	default:
> > +		method = "SBLL";
> > +		break;
> >  	}
> 
> This is not necessary something actionable, but I am wondering about the
> rationale of using a switch statement here given that there really are only
> two options.  In my mind at least a simple "if" clause would be clearer and
> easier to read (with or without the braces):
> 
>   if (use_alt_lcd_levels) {
>           method = "SBL2";
>   } else {
>           method = "SBLL";
>   }

Ah, the reason for the use of the switch was to prepare the way for patch 
06/11 which adds an autodetection value to the definition of
use_alt_lcd_levels.  All good.

Regards
  jonathan

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[PATCH v2 00/11] fujitsu-laptop: backlight cleanup Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 11/11] platform/x86: fujitsu-laptop: remove redundant fields from struct fujitsu_bl Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 10/11] platform/x86: fujitsu-laptop: account for backlight power when determining brightness Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 07/11] platform/x86: fujitsu-laptop: make disable_brightness_adjust a boolean Michał Kępień <kernel@kempniu.pl> - 2017-04-05 08:50 +0200
  [PATCH v2 08/11] platform/x86: fujitsu-laptop: ignore errors when setting backlight power Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 06/11] platform/x86: fujitsu-laptop: clean up use_alt_lcd_levels handling Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 02/11] platform/x86: fujitsu-laptop: switch to a managed backlight device Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 04/11] platform/x86: fujitsu-laptop: simplify set_lcd_level() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 05/11] platform/x86: fujitsu-laptop: sync brightness in set_lcd_level() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 01/11] platform/x86: fujitsu-laptop: only handle backlight when appropriate Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 09/11] platform/x86: fujitsu-laptop: do not log set_lcd_level() failures in bl_update_status() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
  [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge set_lcd_level_alt() into set_lcd_level() Michał Kępień <kernel@kempniu.pl> - 2017-04-05 09:00 +0200
    Re: [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge  set_lcd_level_alt() into set_lcd_level() Jonathan Woithe <jwoithe@just42.net> - 2017-04-07 14:00 +0200
      Re: [PATCH v2 03/11] platform/x86: fujitsu-laptop: merge  set_lcd_level_alt() into set_lcd_level() Jonathan Woithe <jwoithe@just42.net> - 2017-04-07 14:10 +0200
  Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Darren Hart <dvhart@infradead.org> - 2017-04-05 17:40 +0200
    Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Michał Kępień <kernel@kempniu.pl> - 2017-04-05 22:00 +0200
      Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Jonathan Woithe <jwoithe@just42.net> - 2017-04-06 02:50 +0200
        Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Darren Hart <dvhart@infradead.org> - 2017-04-06 05:10 +0200
          Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Jonathan Woithe <jwoithe@just42.net> - 2017-04-07 14:20 +0200
            Re: [PATCH v2 00/11] fujitsu-laptop: backlight cleanup Darren Hart <dvhart@infradead.org> - 2017-04-07 20:00 +0200

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