[PATCH] suspend: make it possible to disable serial console suspend

Hack uart_suspend_port() and uart_resume_port() so that serial console
ports are not suspended if CONFIG_DISABLE_CONSOLE_SUSPEND is set.

This makes it possible to debug the suspend and resume routines of all
device drivers as well as the lowest-level swsusp code with the help of the
serial console.
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Acked-by: NPavel Machek <pavel@ucw.cz>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/serial/serial_core.c

@@ -1929,6 +1929,13 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *port)
 
 	mutex_lock(&state->mutex);
 
+#ifdef CONFIG_DISABLE_CONSOLE_SUSPEND
+	if (uart_console(port)) {
+		mutex_unlock(&state->mutex);
+		return 0;
+	}
+#endif
+
 	if (state->info && state->info->flags & UIF_INITIALIZED) {
 		const struct uart_ops *ops = port->ops;
 
@@ -1967,6 +1974,13 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
 
 	mutex_lock(&state->mutex);
 
+#ifdef CONFIG_DISABLE_CONSOLE_SUSPEND
+	if (uart_console(port)) {
+		mutex_unlock(&state->mutex);
+		return 0;
+	}
+#endif
+
 	uart_change_pm(state, 0);
 
 	/*