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tty: serial: fsl_lpuart: adjust buffer length to the intended size
[ Upstream commitf73fd75055
] Based on the fls function definition provided below, we should not subtract 1 to obtain the correct buffer length: fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. Fixes:5887ad43ee
("tty: serial: fsl_lpuart: Use cyclic DMA for Rx") Signed-off-by: Shenwei Wang <shenwei.wang@nxp.com> Link: https://lore.kernel.org/r/20230410195555.1003900-1-shenwei.wang@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -1250,7 +1250,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
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* 10ms at any baud rate.
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* 10ms at any baud rate.
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*/
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*/
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sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2;
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sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2;
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sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1));
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sport->rx_dma_rng_buf_len = (1 << fls(sport->rx_dma_rng_buf_len));
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if (sport->rx_dma_rng_buf_len < 16)
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if (sport->rx_dma_rng_buf_len < 16)
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sport->rx_dma_rng_buf_len = 16;
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sport->rx_dma_rng_buf_len = 16;
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