diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 6d7d448d0fbf56464fe88068ec6551f277f95160..86e028023b66e6518c8d8a91edc5a3012ef001ed 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1094,8 +1094,8 @@ 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);
 	}