diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index 7a3625f..efc971d 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -783,7 +783,9 @@
 		}
 	}
 
+	spin_unlock(&port->lock);
 	tty_flip_buffer_push(tty);
+	spin_lock(&port->lock);
 
 	return psc_ops->raw_rx_rdy(port);
 }