serial: core: tidy invalid baudrate handling in uart_get_baud_rate

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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>
Link: https://lore.kernel.org/r/20231010085926.1021667-2-jcmvbkbc@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Max Filippov 2023-10-10 01:59:22 -07:00 • committed by Greg Kroah-Hartman

parent 1ed59c5e17

commit 23bf72faae

1 changed files with 1 additions and 3 deletions

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drivers/tty/serial/serial_core.c

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