Re: linux-next: User Mode Linux broken

[Richard Weinberger]

On Fri, 22 Oct 2010 09:03:44 +0200 (CEST), Thomas Gleixner
<tglx@xxxxxxxxxxxxx> wrote:
> On Thu, 21 Oct 2010, Richard Weinberger wrote:
>> Am Donnerstag 21 Oktober 2010, 21:45:35 schrieb Thomas Gleixner:
>> > Why shold it solve it ? irq_enable is set to compat_irq_enable which
>> > in turn calls chip->enable.
>> >
>> > So how's that different ?
>>
>> I took a closer look on the issue.
>>
>> check_irq_resend() gets called before irq_chip_set_defaults().
>> In the first call to check_irq_resend() desc->irq_data.chip->irq_enable is
>> NULL. UML dies due to a NULL-pointer dereference...
>>
>> I don't know why check_irq_resend() is called before irq_chip_set_defaults().
>> It's your code. ;-)
> 
> Well, but it only gets called via enable_irq(). So that means
> something is calling enable_irq _before_ request/setup_irq().
> 
> arch/um/kernel/irq.c:init_IRQ() does that :)

Sorry I'm not very familiar with the IRQ stuff.
Does that mean init_IRQ() is not allowed to call enable_irq()?

Thanks,
//richard

> Thanks,
> 
> 	tglx

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