serial-core: skip call set_termios/console_start when no_console_suspend

The commit 4547be7 rewrites suspend and resume functions, this
introduces a problem on the OMAP3EVM platoform. when the kernel boots
with no_console_suspend and we suspend the kernel, then resume it,
the serial console will be not usable. This problem should be common
for all platforms.
The cause for this problem is that when enter suspend, if we choose
no_console_suspend, the console_stop will be skiped. But in resume
function, the console port will be set to uninitialized state by
calling set_termios function and the console_start is called without
checking whether the no_console_suspend is set, Now fix it.

Signed-off-by: Jason Wang <jason77.wang@gmail.com>
Acked-by: Stanislav Brabec <sbrabec@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index cd8511298bcb75e091b4ca582e5a6a425e9bb570..ff21200f94f4a1632721a7f069fbb4996a15087c 100644 (file)
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -2065,7 +2065,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
        /*
         * Re-enable the console device after suspending.
         */
-       if (uart_console(uport)) {
+       if (console_suspend_enabled && uart_console(uport)) {
                uart_change_pm(state, 0);
                uport->ops->set_termios(uport, &termios, NULL);
                console_start(uport->cons);