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| author | Peng Fan <peng.fan@nxp.com> | 2019-11-07 06:42:53 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-17 19:48:55 +0100 |
| commit | 8eac66e1162c6f318dfd2fb517844d364106f83f (patch) | |
| tree | 4d63f27cdfb46ca6a555dbcb0bba5b74548efa88 /drivers/tty/serial/imx.c | |
| parent | 363e1fc285f2d7cc82fa8c88e95105dc1e75ed4f (diff) | |
| download | linux-stable-8eac66e1162c6f318dfd2fb517844d364106f83f.tar.gz linux-stable-8eac66e1162c6f318dfd2fb517844d364106f83f.tar.bz2 linux-stable-8eac66e1162c6f318dfd2fb517844d364106f83f.zip | |
tty: serial: imx: use the sg count from dma_map_sg
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>
Diffstat (limited to 'drivers/tty/serial/imx.c')
| -rw-r--r-- | drivers/tty/serial/imx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 5e08f2657b90..34f602c3a882 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, |