[PATCH net-next 1/4] bonding: update the primary when slave name changed

[Ding Tianhong <dingtianhong@huawei.com>]

If the primary_slave's name changed, but the bond->prams.primay was
still using the old name, it is conflict with the meaning of the
primary, so update the primary when the slave change its name.

Signed-off-by: Ding Tianhong <dingtianhong@huawei.com>
---
 drivers/net/bonding/bond_main.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index e06c445..de646e2 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2860,9 +2860,19 @@ static int bond_slave_netdev_event(unsigned long event,
 		 */
 		break;
 	case NETDEV_CHANGENAME:
-		/*
-		 * TODO: handle changing the primary's name
+		/* if the primary's name changed,
+		 * save the new name for primary.
 		 */
+		if (USES_PRIMARY(bond->params.mode) &&
+		    bond->params.primary[0]) {
+			if (bond->primary_slave &&
+			    strcmp(bond->params.primary,
+				   bond->primary_slave->dev->name)) {
+				strncpy(bond->params.primary,
+					bond->primary_slave->dev->name,
+					IFNAMSIZ);
+			}
+		}
 		break;
 	case NETDEV_FEAT_CHANGE:
 		bond_compute_features(bond);
-- 
1.8.0