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

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Message-ID: <20170407115347.GB15240@marvin.atrad.com.au>
Date:   Fri, 7 Apr 2017 21:23:47 +0930
From:   Jonathan Woithe <jwoithe@...t42.net>
To:     Micha?? K??pie?? <kernel@...pniu.pl>
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 v2 03/11] platform/x86: fujitsu-laptop: merge
 set_lcd_level_alt() into set_lcd_level()

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";
  }

Regards
  jonathan