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dmaengine: fsl-edma: add edma src ID check at request channel

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Check src ID to detect misuse of same src ID for multiple DMA channels.

Signed-off-by: Joy Zou <joy.zou@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240701070232.2519179-3-joy.zou@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Joy Zou 2024-07-01 15:02:32 +08:00 committed by Vinod Koul
parent 90d21f6e57
commit 9542961494
1 changed files with 22 additions and 0 deletions
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22
drivers/dma/fsl-edma-main.c
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@ -100,6 +100,22 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
return fsl_edma_err_handler(irq, dev_id);
}
static bool fsl_edma_srcid_in_use(struct fsl_edma_engine *fsl_edma, u32 srcid)
{
struct fsl_edma_chan *fsl_chan;
int i;
for (i = 0; i < fsl_edma->n_chans; i++) {
fsl_chan = &fsl_edma->chans[i];
if (fsl_chan->srcid && srcid == fsl_chan->srcid) {
dev_err(&fsl_chan->pdev->dev, "The srcid is in use, can't use!");
return true;
}
}
return false;
}
static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
@ -117,6 +133,10 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
if (chan->client_count)
continue;
if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[1]))
return NULL;
if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
chan = dma_get_slave_channel(chan);
if (chan) {
@ -161,6 +181,8 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
continue;
fsl_chan = to_fsl_edma_chan(chan);
if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[0]))
return NULL;
i = fsl_chan - fsl_edma->chans;
fsl_chan->priority = dma_spec->args[1];