tty: serial: fsl_lpuart: fix return value checking
The return value of lpuart_dma_tx_request() is an negative errno on
failure and zero on success.
Fixes: 159381df14
("tty: serial: fsl_lpuart: fix DMA operation when using IOMMU")
Reported-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Link: https://lore.kernel.org/r/20200325090658.25967-2-michael@walle.cc
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1538,7 +1538,7 @@ static void lpuart_tx_dma_startup(struct lpuart_port *sport)
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goto err;
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ret = lpuart_dma_tx_request(&sport->port);
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if (!ret)
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if (ret)
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goto err;
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init_waitqueue_head(&sport->dma_wait);
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