net: introduce new priv_flag indicating iface capable of change mac when running

Introduce IFF_LIVE_ADDR_CHANGE priv_flag and use it to disable
netif_running() check in eth_mac_addr()

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 3 insertions, 1 deletions

diff --git a/include/linux/if.h b/include/linux/if.h
index f995c663c493..1ec407b01e46 100644
--- a/include/linux/if.h
+++ b/include/linux/if.h
@@ -81,6 +81,8 @@
 #define IFF_UNICAST_FLT 0x20000         /* Supports unicast filtering   */
 #define IFF_TEAM_PORT   0x40000         /* device used as team port */
 #define IFF_SUPP_NOFCS  0x80000         /* device supports sending custom FCS */
+#define IFF_LIVE_ADDR_CHANGE 0x100000   /* device supports hardware address
+                                         * change when it's running */
 
 
 #define IF_GET_IFACE    0x0001          /* for querying only */
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 36e58800a9e3..db6a6c17d790 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -283,7 +283,7 @@ int eth_mac_addr(struct net_device *dev, void *p)
 {
         struct sockaddr *addr = p;
 
-        if (netif_running(dev))
+        if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
                 return -EBUSY;
         if (!is_valid_ether_addr(addr->sa_data))
                 return -EADDRNOTAVAIL;