diff options
| author | Valentin Caron <valentin.caron@foss.st.com> | 2022-01-11 17:44:41 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-03 09:27:52 +0100 |
| commit | 6d0b8cc851ca4cc79ec967a1dd4c9a292f43f04e (patch) | |
| tree | de462d47501fc4f35d9f0e5f49a8a1c3b21cb700 | |
| parent | 6acce03f2dcb38acec7fb2556d57d6dffb2bd7d5 (diff) | |
serial: stm32: fix software flow control transfer
commit 037b91ec7729524107982e36ec4b40f9b174f7a2 upstream.
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 f89d1f79be18..83d3645ac2ef 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -279,7 +279,7 @@ static void stm32_start_tx(struct uart_port *port) { struct circ_buf *xmit = &port->state->xmit; - if (uart_circ_empty(xmit)) + if (uart_circ_empty(xmit) && !port->x_char) return; stm32_set_bits(port, USART_CR1, USART_CR1_TXEIE | USART_CR1_TE); |