From 4c751e9d1fdd725feaa8d83e5680dbec3f1f7178 Mon Sep 17 00:00:00 2001 From: Duan Jiong Date: Sat, 8 Sep 2012 16:32:28 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings --- include/linux/etherdevice.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 05955cf09937..4d29153aa4ee 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -139,6 +139,17 @@ static inline void random_ether_addr(u8 *addr) addr [0] |= 0x02; /* set local assignment bit (IEEE802) */ } +/** + * 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 -- 2.47.3