linux-kernel - Re: [PATCH v2] staging: vt6656: Add formula to the vnt_rf

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Message-ID: <20200425105714.GA2071664@kroah.com>
Date:   Sat, 25 Apr 2020 12:57:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Oscar Carter <oscar.carter@....com>
Cc:     Forest Bond <forest@...ttletooquiet.net>,
        devel@...verdev.osuosl.org, Malcolm Priestley <tvboxspy@...il.com>,
        linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v2] staging: vt6656: Add formula to the vnt_rf_addpower
 function

On Thu, Apr 23, 2020 at 07:05:57PM +0200, Oscar Carter wrote:
> Use a formula to calculate the return value of the vnt_rf_addpower
> function instead of the "if" statement with literal values for every
> case.
> 
> Signed-off-by: Oscar Carter <oscar.carter@....com>
> ---
> Changelog v1 -> v2
> - Change the type of "base" variable from s32 to int as Dan Carpenter
>   suggested.
> - Remove the "--" postoperator and replace with (base - 1) as Dan
>   Carpenter suggested. Also, as this expression has a minus before the
>   parenthesis, remove it an apply the minus operator changing the sign of
>   "base" and literal "1".
> 
>  drivers/staging/vt6656/rf.c | 20 +++-----------------
>  1 file changed, 3 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/staging/vt6656/rf.c b/drivers/staging/vt6656/rf.c
> index 06fa8867cfa3..612fd4a59f8a 100644
> --- a/drivers/staging/vt6656/rf.c
> +++ b/drivers/staging/vt6656/rf.c
> @@ -538,28 +538,14 @@ int vnt_rf_write_embedded(struct vnt_private *priv, u32 data)
> 
>  static u8 vnt_rf_addpower(struct vnt_private *priv)
>  {
> +	int base;
>  	s32 rssi = -priv->current_rssi;
> 
>  	if (!rssi)
>  		return 7;
> 
> -	if (priv->rf_type == RF_VT3226D0) {
> -		if (rssi < -70)
> -			return 9;
> -		else if (rssi < -65)
> -			return 7;
> -		else if (rssi < -60)
> -			return 5;
> -	} else {
> -		if (rssi < -80)
> -			return 9;
> -		else if (rssi < -75)
> -			return 7;
> -		else if (rssi < -70)
> -			return 5;
> -	}
> -
> -	return 0;
> +	base = (priv->rf_type == RF_VT3226D0) ? -60 : -70;
> +	return (rssi < base) ? ((rssi - base + 1) / -5) * 2 + 5 : 0;

I _hate_ ? : functions, just spell this out please as a real if()
statement.

thanks,

greg k-h