tty: serial: imx: use the sg count from dma_map_sg
commit596fd8dffb
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:b4cdc8f61b
("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>
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@ -619,7 +619,7 @@ static void imx_uart_dma_tx(struct imx_port *sport)
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dev_err(dev, "DMA mapping error for TX.\n");
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return;
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}
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desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
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desc = dmaengine_prep_slave_sg(chan, sgl, ret,
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DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
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if (!desc) {
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dma_unmap_sg(dev, sgl, sport->dma_tx_nents,
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