diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index c76719c0f453..3d54a43768cd 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -694,6 +694,7 @@ static void pch_request_dma(struct uart_port *port)
 	if (!chan) {
 		dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n",
 			__func__);
+		pci_dev_put(dma_dev);
 		return;
 	}
 	priv->chan_tx = chan;
@@ -710,6 +711,7 @@ static void pch_request_dma(struct uart_port *port)
 			__func__);
 		dma_release_channel(priv->chan_tx);
 		priv->chan_tx = NULL;
+		pci_dev_put(dma_dev);
 		return;
 	}
 
@@ -717,6 +719,8 @@ static void pch_request_dma(struct uart_port *port)
 	priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize,
 				    &priv->rx_buf_dma, GFP_KERNEL);
 	priv->chan_rx = chan;
+
+	pci_dev_put(dma_dev);
 }
 
 static void pch_dma_rx_complete(void *arg)