On 30/07/2019 20:18, David Miller wrote: > From: Nikolay Aleksandrov <[email protected]> > Date: Tue, 30 Jul 2019 14:21:00 +0300 > >> diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c >> index 3d8deac2353d..f8cac3702712 100644 >> --- a/net/bridge/br_multicast.c >> +++ b/net/bridge/br_multicast.c >> @@ -1388,6 +1388,9 @@ br_multicast_leave_group(struct net_bridge *br, >> if (!br_port_group_equal(p, port, src)) >> continue; >> >> + if (p->flags & MDB_PG_FLAGS_PERMANENT) >> + break; >> + > > Like David, I also don't understand why this can be a break. Is it because > permanent entries are always the last on the list? Why will there be no > other entries that might need to be processed on the list? >
The reason is that only one port can match. See the first clause of br_port_group_equal, that port can participate only once. We could easily add a break statement in the end when a match is found and it will be correct. Even in the presence of MULTICAST_TO_UNICAST flag, the port must match and can be added only once.
