527 	struct circ_buf *circ;  in uart_put_char()  local
531 	circ = &state->xmit;  in uart_put_char()
533 	if (!circ->buf) {  in uart_put_char()
538 	if (port && uart_circ_chars_free(circ) != 0) {  in uart_put_char()
539 		circ->buf[circ->head] = c;  in uart_put_char()
540 		circ->head = (circ->head + 1) & (UART_XMIT_SIZE - 1);  in uart_put_char()
557 	struct circ_buf *circ;  in uart_write()  local
571 	circ = &state->xmit;  in uart_write()
572 	if (!circ->buf) {  in uart_write()
578 		c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);  in uart_write()
583 		memcpy(circ->buf + circ->head, buf, c);  in uart_write()
584 		circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);  in uart_write()