bridge: mcast: do nothing if port's multicast_router is set to the same val

This is needed for the upcoming temporary port router. There's no point
to go through the logic if the value is the same.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 71c109b0943fc8ee8876c93ce41eddfef5c64d30..f1140cf5168daf1f8141d57bb72d1b4186570aa5 100644 (file)
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1853,7 +1853,10 @@ int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
        int err = -EINVAL;
 
        spin_lock(&br->multicast_lock);
-
+       if (p->multicast_router == val) {
+               err = 0;
+               goto unlock;
+       }
        switch (val) {
        case MDB_RTR_TYPE_DISABLED:
                p->multicast_router = MDB_RTR_TYPE_DISABLED;