From: Vlad Yasevich <vyasevich@gmail.com>
Date: Wed, 21 Jun 2017 11:59:16 +0000 (-0400)
Subject: macvlan: Do not return error when setting the same mac address
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e26f43faa0d79dd06e9e94829696b68b9940c2ee;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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>
---

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;