ASoC: Intel: catpt: Test dmaengine_submit() result before moving on

After calling dmaengine_submit(), the submitted transfer descriptor
belongs to the DMA engine. Pointer to that descriptor may no longer be
valid after the call and should be tested before awaiting transfer
completion.

Reported-by: Kevin Tian <kevin.tian@intel.com>
Suggested-by: Dave Jiang <dave.jiang@intel.com>
Fixes: 4fac9b31d0b9 ("ASoC: Intel: Add catpt base members")
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20211216115743.2130622-2-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/catpt/dsp.c b/sound/soc/intel/catpt/dsp.c
index 9c5fd18..346bec0 100644 (file)
--- a/sound/soc/intel/catpt/dsp.c
+++ b/sound/soc/intel/catpt/dsp.c
@@ -65,6 +65,7 @@ static int catpt_dma_memcpy(struct catpt_dev *cdev, struct dma_chan *chan,
 {
        struct dma_async_tx_descriptor *desc;
        enum dma_status status;
+       int ret;
 
        desc = dmaengine_prep_dma_memcpy(chan, dst_addr, src_addr, size,
                                         DMA_CTRL_ACK);
@@ -77,13 +78,22 @@ static int catpt_dma_memcpy(struct catpt_dev *cdev, struct dma_chan *chan,
        catpt_updatel_shim(cdev, HMDC,
                           CATPT_HMDC_HDDA(CATPT_DMA_DEVID, chan->chan_id),
                           CATPT_HMDC_HDDA(CATPT_DMA_DEVID, chan->chan_id));
-       dmaengine_submit(desc);
+
+       ret = dma_submit_error(dmaengine_submit(desc));
+       if (ret) {
+               dev_err(cdev->dev, "submit tx failed: %d\n", ret);
+               goto clear_hdda;
+       }
+
        status = dma_wait_for_async_tx(desc);
+       ret = (status == DMA_COMPLETE) ? 0 : -EPROTO;
+
+clear_hdda:
        /* regardless of status, disable access to HOST memory in demand mode */
        catpt_updatel_shim(cdev, HMDC,
                           CATPT_HMDC_HDDA(CATPT_DMA_DEVID, chan->chan_id), 0);
 
-       return (status == DMA_COMPLETE) ? 0 : -EPROTO;
+       return ret;
 }
 
 int catpt_dma_memcpy_todsp(struct catpt_dev *cdev, struct dma_chan *chan,