On Fri 25 Feb 2022 at 15:39, Yu Tu <yu.tu@xxxxxxxxxxx> wrote: > Start the console and run the following commands in turn: > stty -F /dev/ttyAML0 115200 and stty -F /dev/ttyAML0 921600. The > system will stuck. > > Signed-off-by: Yu Tu <yu.tu@xxxxxxxxxxx> > --- > drivers/tty/serial/meson_uart.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/tty/serial/meson_uart.c b/drivers/tty/serial/meson_uart.c > index ba8dc203b9cb..d19349ead738 100644 > --- a/drivers/tty/serial/meson_uart.c > +++ b/drivers/tty/serial/meson_uart.c > @@ -365,8 +365,13 @@ static void meson_uart_set_termios(struct uart_port *port, > writel(val, port->membase + AML_UART_CONTROL); > > baud = uart_get_baud_rate(port, termios, old, 50, 4000000); > + > + spin_unlock_irqrestore(&port->lock, flags); > + > meson_uart_change_speed(port, baud); > > + spin_lock_irqsave(&port->lock, flags); Already told you before, you can make meson_change_speed() clk_set_rate() uses mutex and may sleep. > + > port->read_status_mask = AML_UART_TX_FIFO_WERR; > if (iflags & INPCK) > port->read_status_mask |= AML_UART_PARITY_ERR |
