[PATCH] panic_blink and i8042 unloading

At unload i8042 sets panic_blink to 0.  This will cause problems if kernel
panics later as it will just use it assuming that the pointer is correct.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/panic.c

@@ -42,7 +42,7 @@ static long no_blink(long time)
 }
 
 /* Returns how long it waited in ms */
-long (*panic_blink)(long time) = no_blink;
+long (*panic_blink)(long time);
 EXPORT_SYMBOL(panic_blink);
 
 /**
@@ -77,6 +77,9 @@ NORET_TYPE void panic(const char * fmt, ...)
 
 	notifier_call_chain(&panic_notifier_list, 0, buf);
 
+	if (!panic_blink)
+		panic_blink = no_blink;
+
 	if (panic_timeout > 0)
 	{
 		/*