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powerpc/kdump: Use chip->shutdown to disable IRQs

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I saw this in a kdump kernel:

IOMMU table initialized, virtual merging enabled
Interrupt 155954 (real) is invalid, disabling it.
Interrupt 155953 (real) is invalid, disabling it.

ie we took some spurious interrupts. default_machine_crash_shutdown tries
to disable all interrupt sources but uses chip->disable which maps to
the default action of:

static void default_disable(unsigned int irq)
{
}

If we use chip->shutdown, then we actually mask the IRQ:

static void default_shutdown(unsigned int irq)
{
        struct irq_desc *desc = irq_to_desc(irq);

        desc->chip->mask(irq);
        desc->status |= IRQ_MASKED;
}

Not sure why we don't implement a ->disable action for xics.c, or why
default_disable doesn't mask the interrupt.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-05-10 16:27:38 +00:00 committed by Benjamin Herrenschmidt
parent 0644079410
commit 5d7a87217d
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/kernel/crash.c
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@ -384,7 +384,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
desc->chip->eoi(i);
if (!(desc->status & IRQ_DISABLED))
desc->chip->disable(i);
desc->chip->shutdown(i);
}
/*