serial: 8250_mxpcie: take the line settings from the new termios

mxpcie8250_set_termios() reads the line settings out of
port->state->port.tty, which is only set once the port has been opened.

uart_set_options() builds a termios of its own and calls ->set_termios()
with no tty behind it, so using such a board as the console
(console=ttyS<n>) dereferences a NULL tty during console setup, as does
attaching kgdboc to it and resuming a suspended console from
uart_resume_port().

Read the settings from the termios the serial core passes in instead.
It holds the same values on the normal path - uart_change_line_settings()
passes &tty->termios - and it is what serial8250_do_set_termios() right
above already uses.

Fixes: 55edf8511f47 ("serial: 8250_mxpcie: enable automatic RTS/CTS flow control")
Signed-off-by: Linmao Li <lilinmao@kylinos.cn>
Tested-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Crescent Hsieh <crescentcy.hsieh@moxa.com>
Link: https://patch.msgid.link/20260901041519.114737-4-lilinmao@kylinos.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions