The wake_up_process() of the new irq thread in __setup_irq() is
bogus. The irqaction is not yet set up completely, especially
action->irq is not initialized. As a consequence the irq thread might
dereference the wrong interrupt descriptor.

Remove the wake up and set action->irq before the action is
installed. The thread is woken up from the first interrupt.
Reported-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Buesch <mb@bu3sch.de>