linux-kernel - Re: [PATCH] staging: rtl8192u: ieee80211: Replace bit shifting with BIT macro

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Message-ID: <c118ed83-2dbb-af38-4e6a-20a74ad2905a@embeddedor.com>
Date:   Thu, 25 Apr 2019 17:11:31 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Vatsala Narang <vatsalanarang@...il.com>,
        gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Julia.Lawall@...6.fr
Subject: Re: [PATCH] staging: rtl8192u: ieee80211: Replace bit shifting with
 BIT macro

Hi Vatsala,

On 4/25/19 1:33 PM, Vatsala Narang wrote:
> Challenge suggested by coccinelle.
> 

I think you mean *change*.

See more comments below...


> Replace bit shifting on 1 with the BIT(x) macro.
> Coccinelle script:
> 
> @@
> expression c;
> @@
> 
> -(1 << c)
> +BIT(c)
> 
> Signed-off-by: Vatsala Narang <vatsalanarang@...il.com>
> ---
>  drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
> index fa59c712c74b..c44662f03a6b 100644
> --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
> +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
> @@ -86,7 +86,7 @@ static inline char *rtl819x_translate_scan(struct ieee80211_device *ieee,
>  	/* Add the protocol name */
>  	iwe.cmd = SIOCGIWNAME;
>  	for(i=0; i<ARRAY_SIZE(ieee80211_modes); i++) {
> -		if(network->mode&(1<<i)) {
> +		if(network->mode&BIT(i)) {

A space is required before the open parenthesis: 'if ('.  Also, add
spaces around operators, in this case around '&'.

>  			sprintf(pname,ieee80211_modes[i].mode_string,ieee80211_modes[i].mode_size);
>  			pname +=ieee80211_modes[i].mode_size;
>  		}
> @@ -394,7 +394,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
>  		sec.key_sizes[key] = len;
>  		(*crypt)->ops->set_key(sec.keys[key], len, NULL,
>  				       (*crypt)->priv);
> -		sec.flags |= (1 << key);
> +		sec.flags |= BIT(key);
>  		/* This ensures a key will be activated if no key is
>  		 * explicitely set */

You could send a separate patch to fix the typo in the above
comment: explicitely -> explicitly.

I encourage you to adopt the practice of running checkpatch.pl
on your patches before submitting them.

Thanks
--
Gustavo

>  		if (key == sec.active_key)
> @@ -415,7 +415,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
>  			(*crypt)->ops->set_key(sec.keys[key], 13, NULL,
>  					       (*crypt)->priv);
>  			sec.key_sizes[key] = 13;
> -			sec.flags |= (1 << key);
> +			sec.flags |= BIT(key);
>  		}
>  
>  		/* No key data - just set the default TX key index */
> @@ -636,7 +636,7 @@ int ieee80211_wx_set_encode_ext(struct ieee80211_device *ieee,
>  	if (ext->alg != IW_ENCODE_ALG_NONE) {
>  		//memcpy(sec.keys[idx], ext->key, ext->key_len);
>  		sec.key_sizes[idx] = ext->key_len;
> -		sec.flags |= (1 << idx);
> +		sec.flags |= BIT(idx);
>  		if (ext->alg == IW_ENCODE_ALG_WEP) {
>  		      //  sec.encode_alg[idx] = SEC_ALG_WEP;
>  			sec.flags |= SEC_LEVEL;
>