Man page 9 : xprt_release_xprt_cong

xprt_release_xprt_cong - allow other requests to use a transport

void xprt_release_xprt_cong(struct rpc_xprt *  xprt , struct rpc_task *  task );

xprt
    transport with other tasks potentially waiting

task
    task that is releasing access to the transport

Note that « task » can be NULL. Another task is awoken to use the transport if the transportAqs congestion window allows it.