Andrew Morton <[email protected]> writes:
> OK, thanks.
>
> I don't think this necessarily tells us where the bug lies. It could be
> some pre-existing thing in MSI, or it could be added by Bryce's changes.
> Or by Eric's. Or, of course, by
> genirq-convert-the-i386-architecture-to-irq-chips.patch.
>
> There doesn't seem to be a lot of movement on this and we want to get the
> x86 genirq conversion into 2.6.19. Could be that we end up having to merge
> known-buggy stuff into mainline and crash enough computers to irritate
> someone into fixing it. Rather sad.
Ok. Looking at it I almost certain the problem is that
we lost the hunk of code removed in: 266f0566761cf88906d634727b3d9fc2556f5cbd
i386: Fix stack switching in do_IRQ
- if (!irq_desc[irq].handle_irq) {
- __do_IRQ(irq, regs);
- goto out_exit;
- }
The msi code does not yet set desc->handle_irq. So when we attempt
to call it we get a NULL pointer dereference.
Except for adding that hunk back in and breaking 4K stacks I don't
have an immediate fix.
I do have a pending cleanup that should result in us setting handle_irq
in all cases. I will see if I can advance that shortly.
Eric
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