Re: 2.6.17-rc5-mm1

Ingo Molnar
2006-05-30T22:57:50Z

* 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