This properly unmaps DMA SG on device shutdown.
Reported-by: Nandor Han <nandor.han@xxxxxx>
Suggested-by: Nandor Han <nandor.han@xxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx>
---
drivers/tty/serial/imx.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 3ca767b1162a..6c53e74244ec 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);
--
2.17.0
--
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