97 		tty->read_buf[tty->read_head] = c;  in put_tty_queue_nolock()
98 		tty->read_head = (tty->read_head + 1) & (N_TTY_BUF_SIZE-1);  in put_tty_queue_nolock()
148 	tty->read_head = tty->read_tail = tty->read_cnt = 0;  in reset_buffer_flags()
388 	if (tty->read_head == tty->canon_head) {  in eraser()
399 			tty->read_cnt -= ((tty->read_head - tty->canon_head) &  in eraser()
401 			tty->read_head = tty->canon_head;  in eraser()
407 			tty->read_cnt -= ((tty->read_head - tty->canon_head) &  in eraser()
409 			tty->read_head = tty->canon_head;  in eraser()
422 	while (tty->read_head != tty->canon_head) {  in eraser()
423 		head = (tty->read_head - 1) & (N_TTY_BUF_SIZE-1);  in eraser()
433 		tty->read_head = head;  in eraser()
451 				while (tail != tty->read_head) {  in eraser()
494 	if (tty->read_head == tty->canon_head)  in eraser()
653 			if (tty->canon_head == tty->read_head)  in n_tty_receive_char()
719 			while (tail != tty->read_head) {  in n_tty_receive_char()
736 		        if (tty->canon_head != tty->read_head)  in n_tty_receive_char()
752 				if (tty->canon_head == tty->read_head)  in n_tty_receive_char()
765 			set_bit(tty->read_head, &tty->read_flags);  in n_tty_receive_char()
767 			tty->canon_head = tty->read_head;  in n_tty_receive_char()
787 			if (tty->canon_head == tty->read_head)  in n_tty_receive_char()
874 				   N_TTY_BUF_SIZE - tty->read_head));  in n_tty_receive_buf()
875 		memcpy(tty->read_buf + tty->read_head, cp, i);  in n_tty_receive_buf()
876 		tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1);  in n_tty_receive_buf()
882 			       N_TTY_BUF_SIZE - tty->read_head));  in n_tty_receive_buf()
883 		memcpy(tty->read_buf + tty->read_head, cp, i);  in n_tty_receive_buf()
884 		tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1);  in n_tty_receive_buf()