linux-kernel - Re: [PATCH 1/5] staging: rtl8723bs: refactor cckrates{only}

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Date:   Sat, 12 Sep 2020 11:22:08 -0700
From:   Joe Perches <joe@...ches.com>
To:     Michael Straube <straube.linux@...il.com>,
        gregkh@...uxfoundation.org
Cc:     hdegoede@...hat.com, Larry.Finger@...inger.net,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] staging: rtl8723bs: refactor cckrates{only}_included

On Sat, 2020-09-12 at 10:45 +0200, Michael Straube wrote:
> Refactor cckrates_included() and cckratesonly_included() to simplify
> the code and improve readability.
> 
> Signed-off-by: Michael Straube <straube.linux@...il.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_wlan_util.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_wlan_util.c b/drivers/staging/rtl8723bs/core/rtw_wlan_util.c
> index a5790a648a5b..4e0d86b2e2e0 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_wlan_util.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_wlan_util.c
> @@ -56,11 +56,12 @@ static u8 rtw_basic_rate_ofdm[3] = {
>  
>  int cckrates_included(unsigned char *rate, int ratelen)
>  {
> -	int	i;
> +	int i;
>  
>  	for (i = 0; i < ratelen; i++) {
> -		if  ((((rate[i]) & 0x7f) == 2)	|| (((rate[i]) & 0x7f) == 4) ||
> -		     (((rate[i]) & 0x7f) == 11)  || (((rate[i]) & 0x7f) == 22))
> +		u8 r = rate[i] & 0x7f;
> +
> +		if (r == 2 || r == 4 || r == 11 || r == 22)
>  			return true;
>  	}
>  
> @@ -69,11 +70,12 @@ int cckrates_included(unsigned char *rate, int ratelen)
>  
>  int cckratesonly_included(unsigned char *rate, int ratelen)
>  {
> -	int	i;
> +	int i;
>  
>  	for (i = 0; i < ratelen; i++) {
> -		if  ((((rate[i]) & 0x7f) != 2) && (((rate[i]) & 0x7f) != 4) &&
> -		     (((rate[i]) & 0x7f) != 11)  && (((rate[i]) & 0x7f) != 22))
> +		u8 r = rate[i] & 0x7f;
> +
> +		if (r != 2 && r != 4 && r != 11 && r != 22)
>  			return false;

It would be simpler to add and use an inline like:

static bool is_cckrate(unsigned char rate)
{
	rate &= 0x7f;
	return rate == 2 || rate == 4 || rate == 11 || rate == 22;
}

so these could be

bool cckrates_included(unsigned char *rate, int ratelen)
{
	int i;

	for (i = 0; i < ratelen; i++) {
		if (is_cckrate(rate[i])
			return true;
	}

	return false;
}

bool cckratesonly_included(unsigned char *rate, int ratelen)
{
	int i;

	if (i <= 0)
		return false;

	for (i = 0; i < ratelen; i++) {
		if (!is_cckrate(rate[i])
			return false;
	}

	return true;
}