diff mbox series

[v5,1/5] serial: core: tidy invalid baudrate handling in uart_get_baud_rate

Message ID 20231010085926.1021667-2-jcmvbkbc@gmail.com
State New
Headers show
Series serial: add drivers for the ESP32xx serial devices | expand

Commit Message

Max Filippov Oct. 10, 2023, 8:59 a.m. UTC 
uart_get_baud_rate has input parameters 'min' and 'max' limiting the
range of acceptable baud rates from the caller's perspective. If neither
current or old termios structures have acceptable baud rate setting and
9600 is not in the min/max range either the function returns 0 and
issues a warning.
However for a UART that does not support speed of 9600 baud this is
expected behavior.
Clarify that 0 can be (and always could be) returned from the
uart_get_baud_rate. Don't issue a warning in that case.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
---
Changes v4->v5:
- fix commit message

Changes v3->v4:
- drop WARN_ON from uart_get_divisor()

 drivers/tty/serial/serial_core.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 7bdc21d5e13b..3f130fe9f1a0 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -431,7 +431,7 @@  EXPORT_SYMBOL(uart_update_timeout);
  * baud.
  *
  * If the new baud rate is invalid, try the @old termios setting. If it's still
- * invalid, we try 9600 baud.
+ * invalid, we try 9600 baud. If that is also invalid 0 is returned.
  *
  * The @termios structure is updated to reflect the baud rate we're actually
  * going to be using. Don't do this for the case where B0 is requested ("hang
@@ -515,8 +515,6 @@  uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
 							max - 1, max - 1);
 		}
 	}
-	/* Should never happen */
-	WARN_ON(1);
 	return 0;
 }
 EXPORT_SYMBOL(uart_get_baud_rate);