On Tue, Sep 08, 2015 at 04:02:29PM +0200, Thomas Gleixner wrote:
> 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);
There seems to be no irq_data_get_chip() helper in current mainline. So
I replaced this with:
chip = idata->chip;
> + chip->irq_set_affinity(idata, mask, false);
> }
> -
> }
> #endif
With the above change the patch fixes the problem, thanks!
Tested-by: Mika Westerberg <mika.westerb...@linux.intel.com>
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