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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 5cea7d257426..b4cf24c64a15 100644
--- 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;
         }