etherdevice: introduce help function eth_zero_addr()

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>

diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index d426336d92d9e4bb34f5f049bc7f4f05d49303bb..b006ba0a9f4269e79d8bfae11415e8b3c8785f69 100644 (file)
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -150,6 +150,17 @@ static inline void eth_broadcast_addr(u8 *addr)
        memset(addr, 0xff, ETH_ALEN);
 }
 
+/**
+ * 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);
+}
+
 /**
  * eth_hw_addr_random - Generate software assigned random Ethernet and
  * set device flag