This is a note to let you know that I've just added the patch titled
serial: stm32-usart: Correct CSIZE, bits, and parity
to the 5.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-stm32-usart-correct-csize-bits-and-parity.patch
and it can be found in the queue-5.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7e8064d7e34fe33b94ca3389516e355d581c61ce
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Thu May 19 11:18:07 2022 +0300
serial: stm32-usart: Correct CSIZE, bits, and parity
[ Upstream commit 1deeda8d2877c18bc2b9eeee10dd6d2628852848 ]
Add CSIZE sanitization for unsupported CSIZE configurations. In
addition, if parity is asked for but CSx was unsupported, the sensible
result is CS8+parity which requires setting USART_CR1_M0 like with 9
bits.
Incorrect CSIZE results in miscalculation of the frame bits in
tty_get_char_size() or in its predecessor where the roughly the same
code is directly within uart_update_timeout().
Fixes: c8a9d043947b (serial: stm32: fix word length configuration)
Cc: Erwan Le Ray <erwan.leray@xxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220519081808.3776-9-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 87b5cd4c9743..3c551fd4f3ff 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1037,13 +1037,22 @@ static void stm32_usart_set_termios(struct uart_port *port,
* CS8 or (CS7 + parity), 8 bits word aka [M1:M0] = 0b00
* M0 and M1 already cleared by cr1 initialization.
*/
- if (bits == 9)
+ if (bits == 9) {
cr1 |= USART_CR1_M0;
- else if ((bits == 7) && cfg->has_7bits_data)
+ } else if ((bits == 7) && cfg->has_7bits_data) {
cr1 |= USART_CR1_M1;
- else if (bits != 8)
+ } else if (bits != 8) {
dev_dbg(port->dev, "Unsupported data bits config: %u bits\n"
, bits);
+ cflag &= ~CSIZE;
+ cflag |= CS8;
+ termios->c_cflag = cflag;
+ bits = 8;
+ if (cflag & PARENB) {
+ bits++;
+ cr1 |= USART_CR1_M0;
+ }
+ }
if (ofs->rtor != UNDEF_REG && (stm32_port->rx_ch ||
(stm32_port->fifoen &&
