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

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Date:	Thu, 23 Aug 2012 14:40:28 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
	gregkh@...uxfoundation.org
Cc:	yongjun_wei@...ndmicro.com.cn, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: r8712u: use is_zero_ether_addr() instead of memcmp()

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(-)

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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