From: Pali Rohár pali@kernel.org
stable inclusion from stable-v5.10.150 commit 8f740c11d89157bd74849ae388288075e05e2a34 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I6D0XA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
[ Upstream commit 379a33786d489ab81885ff0b3935cfeb36137fea ]
Since commit edc6afc54968 ("tty: switch to ktermios and new framework") termios speed is no longer stored only in c_cflag member but also in new additional c_ispeed and c_ospeed members. If BOTHER flag is set in c_cflag then termios speed is stored only in these new members.
Since commit 027b57170bf8 ("serial: core: Fix initializing and restoring termios speed") termios speed is available also in struct console.
So properly restore also c_ispeed and c_ospeed members after suspend to fix restoring termios speed which is not represented by Bnnn constant.
Fixes: 4516d50aabed ("serial: 8250: Use canary to restart console after suspend") Signed-off-by: Pali Rohár pali@kernel.org Link: https://lore.kernel.org/r/20220924104324.4035-1-pali@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Jialin Zhang zhangjialin11@huawei.com --- drivers/tty/serial/8250/8250_port.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 3caa4aa193f6..71d143c00248 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -3288,8 +3288,13 @@ static void serial8250_console_restore(struct uart_8250_port *up) unsigned int baud, quot, frac = 0;
termios.c_cflag = port->cons->cflag; - if (port->state->port.tty && termios.c_cflag == 0) + termios.c_ispeed = port->cons->ispeed; + termios.c_ospeed = port->cons->ospeed; + if (port->state->port.tty && termios.c_cflag == 0) { termios.c_cflag = port->state->port.tty->termios.c_cflag; + termios.c_ispeed = port->state->port.tty->termios.c_ispeed; + termios.c_ospeed = port->state->port.tty->termios.c_ospeed; + }
baud = serial8250_get_baud_rate(port, &termios, NULL); quot = serial8250_get_divisor(port, baud, &frac);