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dmaengine i.MX sdma: check sg entries for valid addresses and lengths 

This patch lets sdma_prep_slave_sg fail if the entries of an
sg list do not start on multiples of the word size or if the
lengths are not multiple of the word size.
Also, catch the previously unhandled DMA_SLAVE_BUSWIDTH_8_BYTES
and DMA_SLAVE_BUSWIDTH_UNDEFINED cases.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2011-01-12 13:02:28 +01:00
parent b9b3f82f94
commit 1fa81c270d
1 changed files with 17 additions and 3 deletions
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20
drivers/dma/imx-sdma.c
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@ -925,10 +925,24 @@ static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
ret = -EINVAL;
goto err_out;
}
if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
switch (sdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
bd->mode.command = 0;
else
bd->mode.command = sdmac->word_size;
if (count & 3 || sg->dma_address & 3)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
bd->mode.command = 2;
if (count & 1 || sg->dma_address & 1)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
bd->mode.command = 1;
break;
default:
return NULL;
}
param = BD_DONE | BD_EXTD | BD_CONT;