TTY: synclink: fix DTR being raised on hang up

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>

diff --git a/drivers/tty/synclink.c b/drivers/tty/synclink.c
index 72d607101f90c2723a923b0301521627c14723de..8eaf1ab8addb1d30faae7b93a28e532fad6a1cf6 100644 (file)
--- a/drivers/tty/synclink.c
+++ b/drivers/tty/synclink.c
@@ -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);