qdio_enable_async_operation  408 drivers/s390/cio/qdio.h int qdio_enable_async_operation(struct qdio_output_q *q);
qdio_enable_async_operation 1309 drivers/s390/cio/qdio_main.c 			if (qdio_enable_async_operation(&q->u.out) < 0) {