--- zzzz-none-000/linux-3.10.107/drivers/isdn/i4l/isdn_tty.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/isdn/i4l/isdn_tty.c	2021-02-04 17:41:59.000000000 +0000
@@ -1043,11 +1043,6 @@
 	if (!(cflag & PARODD))
 		cval |= UART_LCR_EPAR;
 
-	/* CTS flow control flag and modem status interrupts */
-	if (cflag & CRTSCTS) {
-		port->flags |= ASYNC_CTS_FLOW;
-	} else
-		port->flags &= ~ASYNC_CTS_FLOW;
 	if (cflag & CLOCAL)
 		port->flags &= ~ASYNC_CHECK_CD;
 	else {
@@ -1587,7 +1582,7 @@
 	 * line status register.
 	 */
 	if (port->flags & ASYNC_INITIALIZED) {
-		tty_wait_until_sent_from_close(tty, 3000);	/* 30 seconds timeout */
+		tty_wait_until_sent(tty, 3000);	/* 30 seconds timeout */
 		/*
 		 * Before we drop DTR, make sure the UART transmitter
 		 * has completely drained; this is especially