From: Johan Hovold <jhovold@gmail.com>
Date: Fri, 12 Apr 2013 08:32:29 +0000 (+0200)
Subject: TTY: synclink_gt: fix DTR being raised on hang up
X-Git-Tag: firefly_0821_release~3680^2~673^2~13
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5d8be15a621d739c376572607bab1ac0449947a4;p=firefly-linux-kernel-4.4.55.git

TTY: synclink_gt: 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_gt.c b/drivers/tty/synclink_gt.c
index aa9eece35c3b..1abf946463f6 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.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);