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tty: serial: fsl_lpuart: adjust buffer length to the intended size

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[ Upstream commit f73fd750552524b06b5d77ebfdd106ccc8fcac61 ]

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>
This commit is contained in:
Shenwei Wang 2023-04-10 14:55:55 -05:00 • committed by Greg Kroah-Hartman
parent 26d40b3fca
commit 1ae3e5f202
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/fsl_lpuart.c
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@ -1276,7 +1276,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport)
* 10ms at any baud rate. * 10ms at any baud rate.
*/ */
sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2; sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2;
sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1)); sport->rx_dma_rng_buf_len = (1 << fls(sport->rx_dma_rng_buf_len));
if (sport->rx_dma_rng_buf_len < 16) if (sport->rx_dma_rng_buf_len < 16)
sport->rx_dma_rng_buf_len = 16; sport->rx_dma_rng_buf_len = 16;