diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 997eba4dcbeb656b43644d3c3f091945c75fe294..4dff17902fa04990f3bdb7d00c904cea5974cdd6 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -550,10 +550,13 @@ static int pl2303_tiocmset(struct tty_struct *tty,
 	spin_unlock_irqrestore(&priv->lock, flags);
 
 	mutex_lock(&serial->disc_mutex);
-	if (!serial->disconnected)
+	if (!serial->disconnected) {
 		ret = pl2303_set_control_lines(port, control);
-	else
+		if (ret)
+			ret = usb_translate_errors(ret);
+	} else {
 		ret = -ENODEV;
+	}
 	mutex_unlock(&serial->disc_mutex);
 
 	return ret;