[PATCH net-next 2/3] bridge: mcast: do nothing if port's multicast_router is set to the same val

[Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxx>
---
 net/bridge/br_multicast.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 015c47dd1364..496f808f9aa1 100644
--- 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:
 		__del_port_router(p);
-- 
2.4.3