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authorPeng Fan <peng.fan@nxp.com>2019-11-07 09:42:53 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-11-13 14:01:15 +0300
commit596fd8dffb745afcebc0ec6968e17fe29f02044c (patch)
tree03dbb1e89199280cbb866da6661228c8b998daff /drivers/tty
parentfba67e8f897870403e1a4f5fe3835c870cd589e0 (diff)
downloadlinux-596fd8dffb745afcebc0ec6968e17fe29f02044c.tar.xz
tty: serial: imx: use the sg count from dma_map_sg
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/imx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 357d3ff34d51..a9e20e6c63ad 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,