netdev - [net-next] bond: set mac address only if necessary

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Message-Id: <1459264457-19000-1-git-send-email-zhangshengju@cmss.chinamobile.com>
Date:	Tue, 29 Mar 2016 15:14:17 +0000
From:	Zhang Shengju <zhangshengju@...s.chinamobile.com>
To:	j.vosburgh@...il.com, vfalico@...il.com, gospo@...ulusnetworks.com
Cc:	netdev@...r.kernel.org
Subject: [net-next] bond: set mac address only if necessary

Bond device gets it's mac address from the first slave device, it's not
necessary to set slave device's mac address to bond if equal.

Signed-off-by: Zhang Shengju <zhangshengju@...s.chinamobile.com>
---
 drivers/net/bonding/bond_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 97fad05..6569219 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1473,8 +1473,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	 */
 	ether_addr_copy(new_slave->perm_hwaddr, slave_dev->dev_addr);
 
-	if (!bond->params.fail_over_mac ||
-	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
+	if ((!bond->params.fail_over_mac ||
+	    BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) &&
+	    !ether_addr_equal_64bits(bond_dev->dev_addr, slave_dev->dev_addr)) {
 		/* Set slave to master's mac address.  The application already
 		 * set the master's mac address to that of the first slave
 		 */
-- 
1.8.3.1