From ae84db9661cafc63d179e1d985a2c5b841ff0ac4 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Wed, 9 Jul 2014 09:21:14 -0400 Subject: [PATCH] serial: core: Preserve termios c_cflag for console resume When a tty is opened for the serial console, the termios c_cflag settings are inherited from the console line settings. However, if the tty is subsequently closed, the termios settings are lost. This results in a garbled console if the console is later suspended and resumed. Preserve the termios c_cflag for the serial console when the tty is shutdown; this reflects the most recent line settings. Fixes: Bugzilla #69751, 'serial console does not wake from S3' Reported-by: Valerio Vanni Acked-by: Alan Cox Signed-off-by: Peter Hurley Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index a0e2f9d63b9d..127ac6c8fd40 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -243,6 +243,9 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state) /* * Turn off DTR and RTS early. */ + if (uart_console(uport) && tty) + uport->cons->cflag = tty->termios.c_cflag; + if (!tty || (tty->termios.c_cflag & HUPCL)) uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);