blob: b4bcd7bb69da2f3235fdf57a21941d53d5305559 [file] [log] [blame]
From: Duan Jiong <djduanjiong@gmail.com>
Date: Sat, 8 Sep 2012 16:32:28 +0000
Subject: etherdevice: introduce help function eth_zero_addr()
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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.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