Re: BUG? genirq: irq 14 uses trigger mode 8; requested 0

Jon Hunter
2016-11-07T15:54:12Z

On 07/11/16 14:59, Mika Westerberg wrote:
> On Mon, Nov 07, 2016 at 02:40:47PM +0000, Marc Zyngier wrote:
>> Sorry, missed this discussion entirely, as I was on the other side of
>> the world. Not having a irq_set_type definitely seems odd (and
>> configuring the trigger outside of the IRQ framework is quite ugly).
>>
>> Mika, can you please try the following (which is fully untested)?
>>
>> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
>> index 48e6d84..822a6b8 100644
>> --- a/arch/x86/kernel/apic/io_apic.c
>> +++ b/arch/x86/kernel/apic/io_apic.c
>> @@ -1868,6 +1868,15 @@ static int ioapic_set_affinity(struct irq_data *irq_data,
>> return ret;
>> }
>>
>> +static int ioapic_set_type(struct irq_data *data, unsigned int flow_type)
>> +{
>> + /*
>> + * The IOAPIC has already been programmed behind our back,
>> + * just pretend it all went OK, and too bad if it didn't.
>> + */
>> + return 0;
>> +}
>> +
>> static struct irq_chip ioapic_chip __read_mostly = {
>> .name = "IO-APIC",
>> .irq_startup = startup_ioapic_irq,
>> @@ -1876,6 +1885,7 @@ static struct irq_chip ioapic_chip __read_mostly = {
>> .irq_ack = irq_chip_ack_parent,
>> .irq_eoi = ioapic_ack_level,
>> .irq_set_affinity = ioapic_set_affinity,
>> + .irq_set_type = ioapic_set_type,
>> .flags = IRQCHIP_SKIP_SET_WAKE,
>> };
>
> Thanks! This fixes the problem for me.

Good to know. The more I think about this, the more I wonder if we
should have a dummy 'set_type' as this is just hiding the issue. If the
original warning does not impact the overall behaviour (ie. interrupts
still working) then may be it is legitimate as far as gen-irq is concerned?

Jon

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