> Subject: [PATCH] tty: serial: imx: use the sg count from dma_map_sg Ignore this patch. Wrong fix, will have V2. Thanks, Peng. > > From: Peng Fan <peng.fan@xxxxxxx> > > 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". > > And update sport->dma_tx_nents with value from dma_map_sg to avoid > modifing dma_unmap_sg > > Fixes: b4cdc8f61beb("serial: imx: add DMA support for imx6q") > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > --- > drivers/tty/serial/imx.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index > 87c58f9f6390..bda7f59ec60e 100644 > --- a/drivers/tty/serial/imx.c > +++ b/drivers/tty/serial/imx.c > @@ -619,6 +619,9 @@ static void imx_uart_dma_tx(struct imx_port *sport) > dev_err(dev, "DMA mapping error for TX.\n"); > return; > } > + > + sport->dma_tx_nents = ret; > + > desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents, > DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); > if (!desc) { > -- > 2.16.4