Re: 2.6.17-rc5-mm1

Ingo Molnar
2006-05-30T22:49:35Z

* Andrew Morton <akpm@osdl.org> wrote:

> On Tue, 30 May 2006 14:24:03 -0700
> Roland Dreier <rdreier@cisco.com> wrote:
>
> > I'm seeing problems with MSI-X interrupts on 2.6.17-rc5-mm1. I'll try
> > to debug the MSI patches in -mm further in the next day or so, but for
> > now I'll post the symptoms.
> >
> > When I load the ib_mthca driver with MSI-X interrupts enabled, I get
> > the following crash as soon as the first interrupt is generated.
>
> 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?

Ingo