bridge: don't age externally added FDB entries

Signed-off-by: Siva Mannem <siva.mannem.lnx@gmail.com>
Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Premkumar Jonnala <pjonnala@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_fdb.c

@@ -299,6 +299,8 @@ void br_fdb_cleanup(unsigned long _data)
 			unsigned long this_timer;
 			if (f->is_static)
 				continue;
+			if (f->added_by_external_learn)
+				continue;
 			this_timer = f->updated + delay;
 			if (time_before_eq(this_timer, jiffies))
 				fdb_delete(br, f);