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

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2011-01-12 14:13:23 +01:00
parent 1e070a6099
commit d07102a1bb
1 changed files with 15 additions and 0 deletions
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15
drivers/dma/imx-dma.c
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@ -243,6 +243,21 @@ static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
else
dmamode = DMA_MODE_WRITE;
switch (imxdmac->word_size) {
case DMA_SLAVE_BUSWIDTH_4_BYTES:
if (sgl->length & 3 || sgl->dma_address & 3)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_2_BYTES:
if (sgl->length & 1 || sgl->dma_address & 1)
return NULL;
break;
case DMA_SLAVE_BUSWIDTH_1_BYTE:
break;
default:
return NULL;
}
ret = imx_dma_setup_sg(imxdmac->imxdma_channel, sgl, sg_len,
dma_length, imxdmac->per_address, dmamode);
if (ret)