Commit c0fca736 authored by Lubomir Rintel's avatar Lubomir Rintel Committed by Vinod Koul
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dmaengine: mmp_tdma: Validate the transfer direction 



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: default avatarLubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200424215020.105281-1-lkundrak@v3.sk


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 7edfe3df

drivers/dma/mmp_tdma.c

+5 −0
Original line number Diff line number Diff line
@@ -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;