diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c
index e8d56e899ec7..d8c937bdf3f9 100644
--- a/drivers/tty/serial/apbuart.c
+++ b/drivers/tty/serial/apbuart.c
@@ -117,9 +117,7 @@ static void apbuart_rx_chars(struct uart_port *port)
 		status = UART_GET_STATUS(port);
 	}
 
-	spin_unlock(&port->lock);
 	tty_flip_buffer_push(&port->state->port);
-	spin_lock(&port->lock);
 }
 
 static void apbuart_tx_chars(struct uart_port *port)