powerpc/kdump: Use chip->shutdown to disable IRQs
commit5d7a87217de48b234b3c8ff8a73059947d822e07
authorAnton Blanchard <anton@samba.org>
Mon, 10 May 2010 16:27:38 +0000 (10 16:27 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 21 May 2010 07:31:10 +0000 (21 17:31 +1000)
treeb78bacd1b933f762333c79cf0cad5e53bc50b3cb
parent0644079410065567e3bb31fcb8e6441f2b7685a9
powerpc/kdump: Use chip->shutdown to disable IRQs

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>
arch/powerpc/kernel/crash.c