+               if (WARN_ON_ONCE(!nb))
+                       goto out;
+

WARN_ON_ONCE() will drop a stack trace to the console - is that going to be 
useful?

If you want a message perhaps:

                if (!nb) {
                        printk_once("something interesting about not having 
access to north bridge\n")
                        goto out;
                }

-Tony
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