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dmaengine: mmp_tdma: Validate the transfer direction

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We only support DMA_DEV_TO_MEM and DMA_MEM_TO_DEV. Let's not do
undefined things with other values and reject them.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200424215020.105281-1-lkundrak@v3.sk
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Lubomir Rintel 2020-04-24 23:50:20 +02:00 committed by Vinod Koul
parent 7edfe3df2a
commit c0fca73609
1 changed files with 5 additions and 0 deletions
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5
drivers/dma/mmp_tdma.c
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@ -427,6 +427,11 @@ static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
int num_periods = buf_len / period_len;
int i = 0, buf = 0;
if (!is_slave_direction(direction)) {
dev_err(tdmac->dev, "unsupported transfer direction\n");
return NULL;
}
if (tdmac->status != DMA_COMPLETE) {
dev_err(tdmac->dev, "controller busy");
return NULL;