From 19b2ba0baffcd707eecd718da4941e74af341e4f Mon Sep 17 00:00:00 2001 From: Yu Tu Date: Fri, 25 Feb 2022 15:39:21 +0800 Subject: [PATCH] tty: serial: meson: The system stuck when you run the stty command on the console to change the baud rate 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 Link: https://lore.kernel.org/r/20220225073922.3947-6-yu.tu@amlogic.com Signed-off-by: Greg Kroah-Hartman --- 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 ba8dc20..d19349e 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); + port->read_status_mask = AML_UART_TX_FIFO_WERR; if (iflags & INPCK) port->read_status_mask |= AML_UART_PARITY_ERR | -- 2.7.4