Re: [Xenomai] Porting Xenomai on Odroid-U3

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On Tue, Jan 27, 2015 at 03:58:12PM +0100, Arnaud Degroote wrote:
> On 27/Jan - 15:00, Gilles Chanteperdrix wrote:
> > On Tue, Jan 27, 2015 at 02:55:06PM +0100, Arnaud Degroote wrote:
> > > On 27/Jan - 14:26, Gilles Chanteperdrix wrote:
> > > > On Tue, Jan 27, 2015 at 02:09:25PM +0100, Arnaud Degroote wrote:
> > > > > I suppose the offender is related to exynos_eint_gpio_irq available here
> > > > > 
> > > > > https://github.com/adegroote/linux/blob/linux-stable-xenomai-odroid-3.17.y/drivers/pinctrl/samsung/pinctrl-exynos.c#L278
> > > > > 
> > > > > but from documentation and other code sample, I don't see the cause of the trouble.
> > > > > Any idea / guidance is welcome. Thanks in advance,
> > > > 
> > > > If all the generic_handle_irq were properly replaced with
> > > > ipipe_handle_demuxed_irq, you should not arrive at
> > > > exynos_eint_gpio_irq via generic_handle_irq. There is a hole somewhere.
> > > 
> > > I double checked, the only generic_handle_irq caller in vmlinux is
> > > handle_IRQ. And the two only callers of handle_IRQ are asm_handle_IRQ
> > > and __ipipe_do_IRQ, so it looks like I'm good on this point.
> > 
> > Unless I misunderstand the trace you have sent, as I said, I suspect
> > you are not.
> 
> I checked it again, and there is really no more call to
> generic_handle_irq. 
> 
> Maybe an interesting point, exynos_eint_gpio_irq appears only in a call
> to devm_request_irq. Does that ring a bell with you? Does it need a
> special behaviour in the Ipipe case ?

Yes, this can not work. It is really strange to use devm_request_irq
for that. Normally chained irq handlers are registered as such, not
as regular handlers.

-- 
					    Gilles.
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