linux-kernel - [PATCH v2 2/4] staging: rtl8723bs: refactor rtw_macaddr

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Date:   Mon, 25 Jun 2018 17:12:36 +0200
From:   Michael Straube <straube.linux@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        joe@...ches.com, dan.carpenter@...cle.com,
        andy.shevchenko@...il.com,
        Michael Straube <straube.linux@...il.com>
Subject: [PATCH v2 2/4] staging: rtl8723bs: refactor rtw_macaddr_cfg()

Using is_broadcast_ether_addr() and is_zero_ether_addr() instead of
testing each byte of the mac[] array for 0xff and 0x00 shortens the
code and improves readability.

If np == NULL, of_get_property() returns NULL, hence the "np" check
is not needed.

Instead of a fixed default mac address use a random one to reduce the
likelihood of mac address collision.

Thanks to Joe Perches and Dan Carpenter.

Signed-off-by: Michael Straube <straube.linux@...il.com>
---
 .../staging/rtl8723bs/core/rtw_ieee80211.c    | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_ieee80211.c b/drivers/staging/rtl8723bs/core/rtw_ieee80211.c
index e55895632921..7aa00d1391f7 100644
--- a/drivers/staging/rtl8723bs/core/rtw_ieee80211.c
+++ b/drivers/staging/rtl8723bs/core/rtw_ieee80211.c
@@ -1177,24 +1177,13 @@ void rtw_macaddr_cfg(struct device *dev, u8 *mac_addr)
 		memcpy(mac, mac_addr, ETH_ALEN);
 	}
 
-	if (((mac[0] == 0xff) && (mac[1] == 0xff) && (mac[2] == 0xff) &&
-	     (mac[3] == 0xff) && (mac[4] == 0xff) && (mac[5] == 0xff)) ||
-	    ((mac[0] == 0x00) && (mac[1] == 0x00) && (mac[2] == 0x00) &&
-	     (mac[3] == 0x00) && (mac[4] == 0x00) && (mac[5] == 0x00))) {
-		if (np &&
-		    (addr = of_get_property(np, "local-mac-address", &len)) &&
+	if (is_broadcast_ether_addr(mac) || is_zero_ether_addr(mac)) {
+		if ((addr = of_get_property(np, "local-mac-address", &len)) &&
 		    len == ETH_ALEN) {
 			memcpy(mac_addr, addr, ETH_ALEN);
 		} else {
-			mac[0] = 0x00;
-			mac[1] = 0xe0;
-			mac[2] = 0x4c;
-			mac[3] = 0x87;
-			mac[4] = 0x00;
-			mac[5] = 0x00;
-			/*  use default mac addresss */
-			memcpy(mac_addr, mac, ETH_ALEN);
-			DBG_871X("MAC Address from efuse error, assign default one !!!\n");
+			eth_random_addr(mac_addr);
+			DBG_871X("MAC Address from efuse error, assign random one !!!\n");
 		}
 	}
 
-- 
2.18.0