TTY: Fix tty miss restart after we turn off flow-control

[pandora-kernel.git] / drivers / tty / n_tty.c

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 8481aae..0f8a785 100644 (file)
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1530,6 +1530,14 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
                        tty->real_raw = 0;
        }
        n_tty_set_room(tty);
+       /*
+        * Fix tty hang when I_IXON(tty) is cleared, but the tty
+        * been stopped by STOP_CHAR(tty) before it.
+        */
+       if (!I_IXON(tty) && old && (old->c_iflag & IXON) && !tty->flow_stopped) {
+               start_tty(tty);
+       }
+
        /* The termios change make the tty ready for I/O */
        wake_up_interruptible(&tty->write_wait);
        wake_up_interruptible(&tty->read_wait);