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| author | Shenwei Wang <shenwei.wang@nxp.com> | 2023-04-10 22:55:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-17 12:11:44 +0300 |
| commit | a4c11d573e77c26765eeb27709c89835546c0d8b (patch) | |
| tree | 0f73a8009ebc412c4996c33b59190b5d16073e60 /drivers/tty | |
| parent | cf70358b419c09e4c049b800e68da9f8c67e0458 (diff) | |
| download | linux-a4c11d573e77c26765eeb27709c89835546c0d8b.tar.xz | |
tty: serial: fsl_lpuart: adjust buffer length to the intended size
[ 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: 5887ad43ee02 ("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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 20dd476e4d1a..e7ab8ec032cf 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -998,7 +998,7 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport) * 10ms at any baud rate. */ 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) sport->rx_dma_rng_buf_len = 16; |