if (drq) { mempool_free(drq, dd->drq_pool); rq->elevator_private = NULL; }
mempool_free(drq, dd->drq_pool); rq->elevator_private = NULL;
static void deadline_put_request(request_queue_t *q, struct request *rq){	struct deadline_data *dd = q->elevator->elevator_data;	struct deadline_rq *drq = RQ_DATA(rq);	if (drq) {		mempool_free(drq, dd->drq_pool);		rq->elevator_private = NULL;	}}