diff options
| author | Valentin Caron <valentin.caron@foss.st.com> | 2022-01-04 19:24:45 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-06 15:58:46 +0100 |
| commit | 195437d14fb424a2ee50d51441181f16fd549789 (patch) | |
| tree | dd46cbd3456df381cb673a6d9e9f45ab7605c61d /drivers/tty | |
| parent | serial: stm32: fix flow control transfer in DMA mode (diff) | |
| download | linux-195437d14fb424a2ee50d51441181f16fd549789.tar.xz linux-195437d14fb424a2ee50d51441181f16fd549789.zip | |
serial: stm32: correct loop for dma error handling
In this error handling, "transmit_chars_dma" function will call
"transmit_chars_pio" once per characters. But "transmit_chars_pio" will
continue to send characters while xmit buffer is not empty.
Remove this useless loop, one call is sufficient.
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20220104182445.4195-5-valentin.caron@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 788e002688f2..1f89ab0e49ac 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -477,7 +477,7 @@ static void stm32_usart_transmit_chars_dma(struct uart_port *port) const struct stm32_usart_offsets *ofs = &stm32port->info->ofs; struct circ_buf *xmit = &port->state->xmit; struct dma_async_tx_descriptor *desc = NULL; - unsigned int count, i; + unsigned int count; if (stm32_usart_tx_dma_started(stm32port)) { if (!stm32_usart_tx_dma_enabled(stm32port)) @@ -542,8 +542,7 @@ static void stm32_usart_transmit_chars_dma(struct uart_port *port) return; fallback_err: - for (i = count; i > 0; i--) - stm32_usart_transmit_chars_pio(port); + stm32_usart_transmit_chars_pio(port); } static void stm32_usart_transmit_chars(struct uart_port *port) |