diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 5a528b8985052017688fd539219b103a04ed1585..4345aa422eed43a146ccd56642b99838b71cdc86 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1384,6 +1384,8 @@ static void sci_tx_dma_release(struct sci_port *s, bool enable_pio)
 
 	s->chan_tx = NULL;
 	s->cookie_tx = -EINVAL;
+	dma_unmap_single(chan->device->dev, s->tx_dma_addr, UART_XMIT_SIZE,
+			 DMA_TO_DEVICE);
 	dma_release_channel(chan);
 	if (enable_pio)
 		sci_start_tx(port);