dmaengine: fsl-edma: add safety check for 'srcid'

Ensure that 'srcid' is a non-zero value to avoid dtb passing invalid
'srcid' to the driver.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240323-8ulp_edma-v3-2-c0e981027c05@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: nxpfrankli

drivers/dma/fsl-edma-main.c

@@ -115,6 +115,13 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
 				chan->device->privatecnt++;
 				fsl_chan = to_fsl_edma_chan(chan);
 				fsl_chan->srcid = dma_spec->args[1];
+
+				if (!fsl_chan->srcid) {
+					dev_err(&fsl_chan->pdev->dev, "Invalidate srcid %d\n",
+						fsl_chan->srcid);
+					return NULL;
+				}
+
 				fsl_edma_chan_mux(fsl_chan, fsl_chan->srcid,
 						true);
 				mutex_unlock(&fsl_edma->fsl_edma_mutex);