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Subject[PATCH] x86, uv: Fix uv with destroy_irq()

Russ found that:

| There is a regression that is causing a NULL pointer dereference
| in free_irte when shutting down xpc. git bisect narrowed it down
| to git commit d585d060b42bd36f6f0b23ff327d3b91f80c7139, which
| changed free_irte(). Reverse applying the patch fixes the problem.

and he bisected to

| commit d585d060b42bd36f6f0b23ff327d3b91f80c7139
| Author: Thomas Gleixner <tglx@linutronix.de>
|Date: Sun Oct 10 12:34:27 2010 +0200
|
| intr_remap: Simplify the code further
|
| Having irq_2_iommu in struct irq_cfg allows further simplifications.

We need to use irq_mapped() for every irq instead of intr_remapping_enabled
overall

Reported-by: Russ Anderson <rja@sgi.com>
Bisected-by: Russ Anderson <rja@sgi.com>
Tested-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
arch/x86/kernel/apic/io_apic.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -3109,7 +3109,7 @@ void destroy_irq(unsigned int irq)

irq_set_status_flags(irq, IRQ_NOREQUEST|IRQ_NOPROBE);

- if (intr_remapping_enabled)
+ if (irq_remapped(get_irq_chip_data(irq)))
free_irte(irq);
raw_spin_lock_irqsave(&vector_lock, flags);
__clear_irq_vector(irq, cfg);

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