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From: Michael Ellerman on 12 May 2010 21:30
On Tue, 2010-05-11 at 18:02 +0200, Vitaly Wool wrote:
> Hi,
>
> > diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
> > index 6f4613d..341d8af 100644
> > --- a/arch/powerpc/kernel/crash.c
> > +++ b/arch/powerpc/kernel/crash.c
> > @@ -375,6 +375,9 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
> > for_each_irq(i) {
> > struct irq_desc *desc = irq_to_desc(i);
> >
> > + if (!desc || !desc->chip || !desc->chip->eoi)
> > + continue;
> > +

Actually almost certain that desc will be NULL. When CONFIG_SPARSE_IRQ=y
(the default), irq_desc's are allocated lazily.

cheers
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