media: stm32-dcmi: catch dma submission error

Test cookie return by dmaengine_submit() and return error if any.
Signed-off-by: NHugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: NHans Verkuil <hansverk@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/stm32/stm32-dcmi.c

@@ -295,6 +295,10 @@ static int dcmi_start_dma(struct stm32_dcmi *dcmi,
 
 	/* Push current DMA transaction in the pending queue */
 	dcmi->dma_cookie = dmaengine_submit(desc);
+	if (dma_submit_error(dcmi->dma_cookie)) {
+		dev_err(dcmi->dev, "%s: DMA submission failed\n", __func__);
+		return -ENXIO;
+	}
 
 	dma_async_issue_pending(dcmi->dma_chan);