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4a4cd70369
l2tp no longer uses the tunnel socket's sk_user_data so drop the code which sets it. In l2tp_validate_socket use l2tp_sk_to_tunnel to check whether a given socket is already attached to an l2tp tunnel since we can no longer use non-null sk_user_data to indicate this. Signed-off-by: James Chapman <jchapman@katalix.com> Signed-off-by: Tom Parkin <tparkin@katalix.com> Signed-off-by: David S. Miller <davem@davemloft.net>