diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 537bcd7c4941de8941c544ea68ce23a30dcd3db6..d9d7506a9f6e75abf442f316bf5a7d7be87e4425 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1078,8 +1078,8 @@ 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);
 	}