3.16.82-rc1 review patch. If anyone has any objections, please let me know.
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From: Peng Fan peng.fan@nxp.com
commit 596fd8dffb745afcebc0ec6968e17fe29f02044c upstream.
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 Link: https://lore.kernel.org/r/1573108875-26530-1-git-send-email-peng.fan@nxp.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/tty/serial/imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -541,7 +541,7 @@ static void imx_dma_tx(struct imx_port * 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) { dev_err(dev, "We cannot prepare for the TX slave dma!\n");