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| author | Valentin Caron <valentin.caron@foss.st.com> | 2022-01-11 17:44:41 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-26 14:52:49 +0100 |
| commit | 037b91ec7729524107982e36ec4b40f9b174f7a2 (patch) | |
| tree | f15fdc17013529055f582895bacf7da9fb114c3c | |
| parent | d3d079bde07e1b7deaeb57506dc0b86010121d17 (diff) | |
| download | linux-037b91ec7729524107982e36ec4b40f9b174f7a2.tar.gz linux-037b91ec7729524107982e36ec4b40f9b174f7a2.tar.bz2 linux-037b91ec7729524107982e36ec4b40f9b174f7a2.zip | |
serial: stm32: fix software flow control transfer
x_char is ignored by stm32_usart_start_tx() when xmit buffer is empty.
Fix start_tx condition to allow x_char to be sent.
Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20220111164441.6178-3-valentin.caron@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index c1b8828451c8..9570002d07e7 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -742,7 +742,7 @@ static void stm32_usart_start_tx(struct uart_port *port) struct serial_rs485 *rs485conf = &port->rs485; struct circ_buf *xmit = &port->state->xmit; - if (uart_circ_empty(xmit)) + if (uart_circ_empty(xmit) && !port->x_char) return; if (rs485conf->flags & SER_RS485_ENABLED) { |