[PATCH 6/8] spi: spi-s3c64xx: Check return values

[Łukasz Stelmach]

Signed-off-by: Łukasz Stelmach <l.stelm...@samsung.com>
---
 drivers/spi/spi-s3c64xx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 505789f91fdf..27d77600a820 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -273,6 +273,7 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
        struct s3c64xx_spi_driver_data *sdd;
        struct dma_slave_config config;
        struct dma_async_tx_descriptor *desc;
+       int ret;
 
        memset(&config, 0, sizeof(config));
 
@@ -296,11 +297,22 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
 
        desc = dmaengine_prep_slave_sg(dma->ch, sgt->sgl, sgt->nents,
                                       dma->direction, DMA_PREP_INTERRUPT);
+       if (!desc) {
+               dev_err(&sdd->pdev->dev, "unable to prepare %s scatterlist",
+                       dma->direction == DMA_DEV_TO_MEM ? "rx" : "tx");
+               return;
+       }
 
        desc->callback = s3c64xx_spi_dmacb;
        desc->callback_param = dma;
 
        dma->cookie = dmaengine_submit(desc);
+       ret = dma_submit_error(dma->cookie);
+       if (ret) {
+               dev_err(&sdd->pdev->dev, "dmaengine_submit() failed %d", ret);
+               return;
+       }
+
        dma_async_issue_pending(dma->ch);
 }
 
-- 
2.26.2