Leave serial console active during freeze and prethaw, so we don't discard
the most interesting diagnostics.

Note that wakeup-enabled serial ports may already be bypassing the suspend
logic on some platforms, for serial ports which are enabled as wakeup
event sources.

Index: linux/drivers/serial/8250.c
===================================================================
--- linux.orig/drivers/serial/8250.c	2006-05-20 11:28:30.000000000 -0700
+++ linux/drivers/serial/8250.c	2006-05-20 11:29:51.000000000 -0700
@@ -2455,13 +2455,37 @@
 	return 0;
 }
 
+/* HACK -- skipconsoles known to work with single serial port,
+ * allowing serial port to work during freeze/prethaw/thaw
+ * ... really the flag should be per-port
+ */
+static int skipconsoles;
+
+/* uart_console() should be in a header ... */
+#ifdef CONFIG_SERIAL_CORE_CONSOLE
+#define uart_console(port)	((port)->cons && (port)->cons->index == (port)->line)
+#else
+#define uart_console(port)	(0)
+#endif
+
 static int serial8250_suspend(struct platform_device *dev, pm_message_t state)
 {
 	int i;
 
-	for (i = 0; i < UART_NR; i++) {
+	for (i = 0;
+			0 &&
+			i < UART_NR; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
+		switch (state.event) {
+		case PM_EVENT_FREEZE:
+		case PM_EVENT_PRETHAW:
+			if (uart_console(&up->port)) {
+				skipconsoles = 1;
+				continue;
+			}
+		}
+
 		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
 			uart_suspend_port(&serial8250_reg, &up->port);
 	}
@@ -2473,9 +2497,16 @@
 {
 	int i;
 
-	for (i = 0; i < UART_NR; i++) {
+	for (i = 0;
+			0 &&
+			i < UART_NR; i++) {
 		struct uart_8250_port *up = &serial8250_ports[i];
 
+		if (skipconsoles && uart_console(&up->port)) {
+			skipconsoles = 0;
+			continue;
+		}
+
 		if (up->port.type != PORT_UNKNOWN && up->port.dev == &dev->dev)
 			uart_resume_port(&serial8250_reg, &up->port);
 	}