TTY: synclink_gt: fix DTR being raised on hang up
authorJohan Hovold <jhovold@gmail.com>
Fri, 12 Apr 2013 08:32:29 +0000 (10:32 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 12 Apr 2013 21:08:17 +0000 (14:08 -0700)
Make sure to check ASYNC_INITIALISED before raising DTR when waking up
from blocked open in block_til_ready.

Currently DTR could get raised at hang up as a blocked process would
raise DTR unconditionally before checking for hang up and returning.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/synclink_gt.c

index aa9eece35c3b922240249f10481733a20de0ad6a..1abf946463f664522d1721a1537a4fdba9d45c25 100644 (file)
@@ -3308,7 +3308,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
        port->blocked_open++;
 
        while (1) {
-               if ((tty->termios.c_cflag & CBAUD))
+               if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
                        tty_port_raise_dtr_rts(port);
 
                set_current_state(TASK_INTERRUPTIBLE);