serial: imx: unmap sg in case of dmaengine_prep_slave_sg() failure

In case dmaengine_prep_slave_sg() fails, add the missing dma_unmap_sg().

Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Anton Bondarenko <anton_bondarenko@mentor.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 5cea7d2..b4cf24c 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -558,6 +558,8 @@ static void imx_dma_tx(struct imx_port *sport)
        desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
                                        DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
        if (!desc) {
+               dma_unmap_sg(dev, sgl, sport->dma_tx_nents,
+                            DMA_TO_DEVICE);
                dev_err(dev, "We cannot prepare for the TX slave dma!\n");
                return;
        }
@@ -947,6 +949,7 @@ static int start_rx_dma(struct imx_port *sport)
        desc = dmaengine_prep_slave_sg(chan, sgl, 1, DMA_DEV_TO_MEM,
                                        DMA_PREP_INTERRUPT);
        if (!desc) {
+               dma_unmap_sg(dev, sgl, 1, DMA_FROM_DEVICE);
                dev_err(dev, "We cannot prepare for the RX slave dma!\n");
                return -EINVAL;
        }