linux-kernel - Re: [PATCH] staging: r8712u: use is_zero_ether

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Date:	Thu, 23 Aug 2012 10:19:24 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Wei Yongjun <weiyj.lk@...il.com>
CC:	florian.c.schilhabel@...glemail.com, gregkh@...uxfoundation.org,
	yongjun_wei@...ndmicro.com.cn, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: r8712u: use is_zero_ether_addr() instead of
 memcmp()

On 08/23/2012 01:40 AM, Wei Yongjun wrote:
> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
>
> Using is_zero_ether_addr() instead of directly use
> memcmp(addr, "\x00\x00\x00\x00\x00\x00", ETH_ALEN)
> to determine if the ethernet address is all zeros.
>
> spatch with a semantic match is used to found this problem.
> (http://coccinelle.lip6.fr/)
>
> Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
> ---
>   drivers/staging/rtl8712/rtl871x_recv.c | 9 +++++----
>   1 file changed, 5 insertions(+), 4 deletions(-)

ACKed-by: Larry Finger <Larry.Finger@...inger.net>

>
> diff --git a/drivers/staging/rtl8712/rtl871x_recv.c b/drivers/staging/rtl8712/rtl871x_recv.c
> index c9d1743..23ec684 100644
> --- a/drivers/staging/rtl8712/rtl871x_recv.c
> +++ b/drivers/staging/rtl8712/rtl871x_recv.c
> @@ -32,6 +32,7 @@
>   #include <linux/slab.h>
>   #include <linux/if_ether.h>
>   #include <linux/kmemleak.h>
> +#include <linux/etherdevice.h>
>
>   #include "osdep_service.h"
>   #include "drv_types.h"
> @@ -331,8 +332,8 @@ static sint sta2sta_data_frame(struct _adapter *adapter,
>   			return _FAIL;
>   		if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
>   			return _FAIL;
> -		if (!memcmp(pattrib->bssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
> -		    !memcmp(mybssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
> +		if (is_zero_ether_addr(pattrib->bssid) ||
> +		    is_zero_ether_addr(mybssid) ||
>   		    (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
>   			return _FAIL;
>   		sta_addr = pattrib->src;
> @@ -409,8 +410,8 @@ static sint ap2sta_data_frame(struct _adapter *adapter,
>   		if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast))
>   			return _FAIL;
>   		/* check BSSID */
> -		if (!memcmp(pattrib->bssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
> -		     !memcmp(mybssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
> +		if (is_zero_ether_addr(pattrib->bssid) ||
> +		     is_zero_ether_addr(mybssid) ||
>   		     (memcmp(pattrib->bssid, mybssid, ETH_ALEN)))
>   			return _FAIL;
>   		if (bmcast)
>
>

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