macvlan: Do not return error when setting the same mac address

The user currently gets an EBUSY error when attempting to set
the mac address on a macvlan device to the same value.

This should really be a no-op as nothing changes.  Catch
the condition and return early.

Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 67bf7ebae5c6..de214fbda173 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -703,6 +703,10 @@ static int macvlan_set_mac_address(struct net_device *dev, void *p)
         if (!is_valid_ether_addr(addr->sa_data))
                 return -EADDRNOTAVAIL;
 
+        /* If the addresses are the same, this is a no-op */
+        if (ether_addr_equal(dev->dev_addr, addr->sa_data))
+                return 0;
+
         if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
                 dev_set_mac_address(vlan->lowerdev, addr);
                 return 0;