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

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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>
This commit is contained in:
Frank Li 2024-03-23 11:34:51 -04:00 committed by Vinod Koul
parent cee8cbfc7b
commit 6aa60f79e6
1 changed files with 7 additions and 0 deletions
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7
drivers/dma/fsl-edma-main.c
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@ -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);