tty: tty port zero baud open

If we have no speed set at some point then we should not raise DTR/RTS at
that point when opening as the tty is not ready

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index ff94182b381368b81543abdc4c2f0641d4e3c92d..0723664fe0ab5487d95be284b7c5a5c12139ddfb 100644 (file)
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -216,7 +216,8 @@ int tty_port_block_til_ready(struct tty_port *port,
 
        while (1) {
                /* Indicate we are open */
-               tty_port_raise_dtr_rts(port);
+               if (tty->termios->c_cflag & CBAUD)
+                       tty_port_raise_dtr_rts(port);
 
                set_current_state(TASK_INTERRUPTIBLE);
                /* Check for a hangup or uninitialised port. Return accordingly */