--- linux-2.4.0-test12/drivers/net/ppp_async.c	Sat Jan 13 18:45:57 2001
+++ linux/drivers/net/ppp_async.c	Sat Jan 13 18:50:11 2001
@@ -864,6 +864,25 @@
 			process_input_packet(ap);
 		} else if (c == PPP_ESCAPE) {
 			ap->state |= SC_ESCAPE;
+		} else if (I_IXON(ap->tty)) {
+			if (c == STOP_CHAR(ap->tty)) {
+				if (!ap->tty->stopped) {
+					ap->tty->stopped = 1;
+					if (ap->tty->driver.stop)
+						(ap->tty->driver.stop)(ap->tty);
+				}
+			} else
+			if (c == START_CHAR(ap->tty)) {
+				if (ap->tty->stopped) {
+					ap->tty->stopped = 0;
+					if (ap->tty->driver.start)
+						(ap->tty->driver.start)(ap->tty);
+					if ((test_bit(TTY_DO_WRITE_WAKEUP, &ap->tty->flags)) &&
+					    ap->tty->ldisc.write_wakeup)
+						(ap->tty->ldisc.write_wakeup)(ap->tty);
+					wake_up_interruptible(&ap->tty->write_wait);
+				}
+			}
 		}
 		/* otherwise it's a char in the recv ACCM */
 		++n;