* Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Ingo Molnar <mingo@elte.hu> wrote:
> 
> > > do_IRQ() did a jump-to-zero.  So there's no handler installed.
> > 
> > yep. No desc->irq_handler. That should be 'impossible' on x86_64, 
> > because the irq_desc[] array is initialized with handle_bad_irq, and 
> > from that point on x86_64 only uses set_irq_chip_and_handler(), which 
> > at most can set it to another (non-NULL) handle_irq function. Weird.
> > 
> > does MSI much with the irq_desc[] separately perhaps, clearing 
> > handle_irq in the process perhaps?
> 
> aha - drivers/pci/msi.c sets msix_irq_type, which has no handle_irq 
> entry. This needs to be converted to irqchips.

still ... that doesnt explain how the irq_desc[].irq_handler got NULL. 

	Ingo
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