On Tue, 8 Sep 2015, Mika Westerberg wrote:
> It says that there are no users for x86_io_apic_ops.set_affinity but then
> it does this:
>
> - x86_io_apic_ops.set_affinity(idata, mask, false);
> + irq_set_affinity(irq, mask);
>
> The difference is that x86_io_apic_ops.set_affinity() programs affinity
> directly to the hardware (if I understand it right) but irq_set_affinity()
> calls irqd_set_move_pending() which defers programming the hardware later.
>
> Now when an interrupt triggers we end up calling irq_move_masked_irq() with
> unlocked descriptor.
>
> Without the above change we never do that and the crash does not happen.
Right. Patch below should fix that issue.
Thanks,
tglx
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 38a76f826530..d2ea50c5e936 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2522,6 +2522,7 @@ void __init setup_ioapic_dest(void)
int pin, ioapic, irq, irq_entry;
const struct cpumask *mask;
struct irq_data *idata;
+ struct irq_chip *chip;
if (skip_ioapic_setup == 1)
return;
@@ -2545,9 +2546,9 @@ void __init setup_ioapic_dest(void)
else
mask = apic->target_cpus();
- irq_set_affinity(irq, mask);
+ chip = irq_data_get_chip(idata);
+ chip->irq_set_affinity(idata, mask, false);
}
-
}
#endif
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