serial: imx: dma_unmap_sg buffers on shutdown

This properly unmaps DMA SG on device shutdown.

Reported-by: Nandor Han <nandor.han@ge.com>
Suggested-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 42a5edd1e0f9..80bed82e0e0e 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1425,10 +1425,18 @@ static void imx_uart_shutdown(struct uart_port *port)
         u32 ucr1, ucr2;
 
         if (sport->dma_is_enabled) {
-                sport->dma_is_rxing = 0;
-                sport->dma_is_txing = 0;
                 dmaengine_terminate_sync(sport->dma_chan_tx);
+                if (sport->dma_is_txing) {
+                        dma_unmap_sg(sport->port.dev, &sport->tx_sgl[0],
+                                     sport->dma_tx_nents, DMA_TO_DEVICE);
+                        sport->dma_is_txing = 0;
+                }
                 dmaengine_terminate_sync(sport->dma_chan_rx);
+                if (sport->dma_is_rxing) {
+                        dma_unmap_sg(sport->port.dev, &sport->rx_sgl,
+                                     1, DMA_FROM_DEVICE);
+                        sport->dma_is_rxing = 0;
+                }
 
                 spin_lock_irqsave(&sport->port.lock, flags);
                 imx_uart_stop_tx(port);