xprt_lock_connect
bool xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
EXPORT_SYMBOL_GPL(xprt_lock_connect);
WARN_ON_ONCE(!xprt_lock_connect(xprt, task, r_xprt));
WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));