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rds_conn_shutdown(), >> where no "rds_tcp.ko" backend specific lock is held. >> > > > AFAICS, from rds_conn_shutdown() path rds_tcp_conn_slots_available() is called with fan-out argument as false. Therefore, no need to get the peer source port. > > I think that should be fine. > True, but IMHO subtle and error-prone. If someone were to change the code to pass in "fan_out == true" from a context not already holding a socket lock, would they remember to change rds_tcp_conn_slots_available() to acquire that lock? Thanks, Gerd