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Subject[PATCH 073/173] powerpc/kdump: Use chip->shutdown to disable IRQs
2.6.27.59-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Anton Blanchard <anton@samba.org>

commit 5d7a87217de48b234b3c8ff8a73059947d822e07 upstream.

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>
Signed-off-by: Kamalesh babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/powerpc/kernel/crash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -381,7 +381,7 @@ void default_machine_crash_shutdown(stru
desc->chip->eoi(i);

if (!(desc->status & IRQ_DISABLED))
- desc->chip->disable(i);
+ desc->chip->shutdown(i);
}

/*



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