diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 8ff0efac6aa0d3f9c8c7ee3c2823cc40fb3a9cd0..77ff272680e1fb686aa66d4d01b52401dc570600 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1107,8 +1107,8 @@ static int uart_tiocmget(struct tty_struct *tty)
 		goto out;
 
 	if (!tty_io_error(tty)) {
-		result = uport->mctrl;
 		spin_lock_irq(&uport->lock);
+		result = uport->mctrl;
 		result |= uport->ops->get_mctrl(uport);
 		spin_unlock_irq(&uport->lock);
 	}