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Message-ID: <20220225073922.3947-6-yu.tu@amlogic.com>
Date: Fri, 25 Feb 2022 15:39:21 +0800
From: Yu Tu <yu.tu@...ogic.com>
To: <linux-serial@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-amlogic@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
Neil Armstrong <narmstrong@...libre.com>,
Kevin Hilman <khilman@...libre.com>,
Jerome Brunet <jbrunet@...libre.com>,
Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
Yu Tu <yu.tu@...ogic.com>
Subject: [PATCH V7 5/6] 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 <yu.tu@...ogic.com>
---
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);
+
port->read_status_mask = AML_UART_TX_FIFO_WERR;
if (iflags & INPCK)
port->read_status_mask |= AML_UART_PARITY_ERR |
--
2.33.1
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