From: Jason Wang Date: Sat, 21 Aug 2010 07:14:42 +0000 (+0800) Subject: serial-core: restore termios settings when resume console ports X-Git-Tag: MMI-PSA29.97-13-9~22002^2~32 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=891b9dd10764352926e1e107756aa229dfa2c210;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git serial-core: restore termios settings when resume console ports The commit 4547be7 rewrites suspend and resume functions. According to this rewrite, when a serial port is a printk console device and can suspend(without set no_console_suspend flag), it will definitely call set_termios function during its resume, but parameter termios isn't initialized, this will pass an unpredictable config to the serial port. If this serial port is not a userspace opened tty device , a suspend and resume action will make this serial port unusable. I.E. ttyS0 is a printk console device, ttyS1 or keyboard+display is userspace tty device, a suspend/resume action will make ttyS0 unusable. If a serial port is both a printk console device and an opened tty device, this issue can be overcome because it will call set_termios again with the correct parameter in the uart_change_speed function. Refer to the deleted content of commit 4547be7, revert parts relate to restore settings into parameter termios. It is safe because if a serial port is a printk console only device, the only meaningful field in termios is c_cflag and its old config is saved in uport->cons->cflag, if this port is also an opened tty device, it will clear uport->cons->cflag in the uart_open and the old config is saved in tty->termios. Signed-off-by: Jason Wang Acked-by: Stanislav Brabec Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index ff21200f94f4..bc6cddd10294 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -2066,6 +2066,18 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) * Re-enable the console device after suspending. */ if (console_suspend_enabled && uart_console(uport)) { + /* + * First try to use the console cflag setting. + */ + memset(&termios, 0, sizeof(struct ktermios)); + termios.c_cflag = uport->cons->cflag; + + /* + * If that's unset, use the tty termios setting. + */ + if (port->tty && port->tty->termios && termios.c_cflag == 0) + termios = *(port->tty->termios); + uart_change_pm(state, 0); uport->ops->set_termios(uport, &termios, NULL); console_start(uport->cons);