spi: imx: fix spi resource leak with dma transfer

In spi_imx_dma_transfer(), when desc_rx = dmaengine_prep_slave_sg()
fails, the context goes to label no_dma and then return. However,
the memory allocated for desc_tx has not been freed yet, which leads
to resource leak.

Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Reviewed-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index d98c33c..6a4ff27 100644 (file)
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -929,7 +929,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
                                        tx->sgl, tx->nents, DMA_MEM_TO_DEV,
                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
                if (!desc_tx)
-                       goto no_dma;
+                       goto tx_nodma;
 
                desc_tx->callback = spi_imx_dma_tx_callback;
                desc_tx->callback_param = (void *)spi_imx;
@@ -941,7 +941,7 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
                                        rx->sgl, rx->nents, DMA_DEV_TO_MEM,
                                        DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
                if (!desc_rx)
-                       goto no_dma;
+                       goto rx_nodma;
 
                desc_rx->callback = spi_imx_dma_rx_callback;
                desc_rx->callback_param = (void *)spi_imx;
@@ -1008,7 +1008,9 @@ static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
 
        return ret;
 
-no_dma:
+rx_nodma:
+       dmaengine_terminate_all(master->dma_tx);
+tx_nodma:
        pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
                     dev_driver_string(&master->dev),
                     dev_name(&master->dev));