From mboxrd@z Thu Jan 1 00:00:00 1970 From: s.hauer@pengutronix.de (Sascha Hauer) Date: Mon, 31 Jan 2011 13:00:46 +0100 Subject: [PATCH 2/4] dmaengine i.MX dma: check sg entries for valid addresses and lengths In-Reply-To: <1296475248-29095-1-git-send-email-s.hauer@pengutronix.de> References: <1296475248-29095-1-git-send-email-s.hauer@pengutronix.de> Message-ID: <1296475248-29095-3-git-send-email-s.hauer@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Signed-off-by: Sascha Hauer --- drivers/dma/imx-dma.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-) diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index a46e1d9..a1eac99 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -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) -- 1.7.2.3