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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> | 2022-02-08 18:15:26 +0100 |
| commit | 63e5f6103766e36e3f51d9e38410f331fb016395 (patch) | |
| tree | 745f108e2cb0e0fe7991f62efd802c9d6e039da0 | |
| parent | 661d011a7cef6582de5d5d5909229b923d88b31a (diff) | |
| download | linux-63e5f6103766e36e3f51d9e38410f331fb016395.tar.gz | |
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 f325019887b2..766941a6e1aa 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -389,7 +389,7 @@ 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_transmit_chars(port); |