serial: imx: unmap scatter gather list in imx_flush_buffer
First, reformat the code to exit immediately. This allows us to add
more code in more readable format.
In case the TX DMA was still running, remove and disable it's resources.
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index b4cf24c..952730a 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1250,10 +1250,17 @@
static void imx_flush_buffer(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
+ struct scatterlist *sgl = &sport->tx_sgl[0];
- if (sport->dma_is_enabled) {
- sport->tx_bytes = 0;
- dmaengine_terminate_all(sport->dma_chan_tx);
+ if (!sport->dma_chan_tx)
+ return;
+
+ sport->tx_bytes = 0;
+ dmaengine_terminate_all(sport->dma_chan_tx);
+ if (sport->dma_is_txing) {
+ dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents,
+ DMA_TO_DEVICE);
+ sport->dma_is_txing = false;
}
}