Commit f73fd750 authored by Shenwei Wang's avatar Shenwei Wang Committed by Greg Kroah-Hartman

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

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: 5887ad43 ("tty: serial: fsl_lpuart: Use cyclic DMA for Rx")
Signed-off-by: default avatarShenwei Wang <shenwei.wang@nxp.com>
Link: https://lore.kernel.org/r/20230410195555.1003900-1-shenwei.wang@nxp.comSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9e4f2a80
......@@ -1296,7 +1296,7 @@ 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;
......
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