Messages in this thread Patch in this message | | | From | Peng Fan <> | Subject | [PATCH V2] tty: serial: imx: use the sg count from dma_map_sg | Date | Thu, 7 Nov 2019 06:42:53 +0000 |
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From: Peng Fan <peng.fan@nxp.com>
The dmaengine_prep_slave_sg needs to use sg count returned by dma_map_sg, not use sport->dma_tx_nents, because the return value of dma_map_sg is not always same with "nents".
Fixes: b4cdc8f61beb("serial: imx: add DMA support for imx6q") Signed-off-by: Peng Fan <peng.fan@nxp.com> ---
V2: Update commit log Drop assigning ret to sport->dma_tx_nents, it is wrong.
drivers/tty/serial/imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 87c58f9f6390..f1ddb2cae31e 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -619,7 +619,7 @@ static void imx_uart_dma_tx(struct imx_port *sport) dev_err(dev, "DMA mapping error for TX.\n"); return; } - desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, + desc = dmaengine_prep_slave_sg(chan, sgl, ret, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); if (!desc) { dma_unmap_sg(dev, sgl, sport->dma_tx_nents, -- 2.16.4
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