From: Tonghao Zhang <xiangxia.m....@gmail.com> Date: Wed, 16 Aug 2017 20:02:45 -0700
> Because we remove the tcp_tw_recycle support in the commit > 4396e46187c ('tcp: remove tcp_tw_recycle') and also delete > the code 'af_ops->route_req' for sysctl_tw_recycle in tcp_conn_request. > Now when we call the 'af_ops->route_req', the dist always is > NULL, and we remove the unnecessay check. > > Signed-off-by: Tonghao Zhang <xiangxia.m....@gmail.com> This is a bug actually, rather than something to paper over by removing the check. Code earlier in this function needs a proper 'dst' in order to operate properly. There is a call to tcp_peer_is_proven() which must have a proper route to make the determination yet it will always be NULL. Please investigate what the code is doing and how a test became "unnecessary" over time before blindly removing it, thank you.