diff --git a/drivers/tty/serial/lpc32xx_hs.c b/drivers/tty/serial/lpc32xx_hs.c
index 8fdf6a8fc074..701644f06820 100644
--- a/drivers/tty/serial/lpc32xx_hs.c
+++ b/drivers/tty/serial/lpc32xx_hs.c
@@ -279,7 +279,10 @@ static void __serial_lpc32xx_rx(struct uart_port *port)
 
 		tmp = readl(LPC32XX_HSUART_FIFO(port->membase));
 	}
+
+	spin_unlock(&port->lock);
 	tty_flip_buffer_push(tport);
+	spin_lock(&port->lock);
 }
 
 static void __serial_lpc32xx_tx(struct uart_port *port)