Re: linux-next: User Mode Linux broken
From: Richard Weinberger
Date: Fri Oct 22 2010 - 06:51:01 EST
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/