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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>
This commit is contained in:
Valentin Caron 2022-01-04 19:24:45 +01:00 committed by Greg Kroah-Hartman
parent 2a3bcfe037
commit 195437d14f
1 changed files with 2 additions and 3 deletions
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5
drivers/tty/serial/stm32-usart.c
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@ -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)