linux-kernel - [PATCH 3.2 78/94] etherdevice: introduce help function eth_zero

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Date:	Sat, 13 Aug 2016 18:42:58 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
	"Duan Jiong" <djduanjiong@...il.com>
Subject: [PATCH 3.2 78/94] etherdevice: introduce help function
 eth_zero_addr()

3.2.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Duan Jiong <djduanjiong@...il.com>

commit 6d57e9078e880a3dd232d579f42ac437a8f1ef7b upstream.

a lot of code has either the memset or an inefficient copy
from a static array that contains the all-zeros Ethernet address.
Introduce help function eth_zero_addr() to fill an address with
all zeros, making the code clearer and allowing us to get rid of
some constant arrays.

Signed-off-by: Duan Jiong <djduanjiong@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/etherdevice.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -140,6 +140,17 @@ static inline void random_ether_addr(u8
 }
 
 /**
+ * eth_zero_addr - Assign zero address
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Assign the zero address to the given address array.
+ */
+static inline void eth_zero_addr(u8 *addr)
+{
+	memset(addr, 0x00, ETH_ALEN);
+}
+
+/**
  * dev_hw_addr_random - Create random MAC and set device flag
  * @dev: pointer to net_device structure
  * @hwaddr: Pointer to a six-byte array containing the Ethernet address