Re: [PATCH v2] gpiolib: Fix GPIO chip IRQ initialization restriction

[Andy Shevchenko]

On Thu, Jun 15, 2023 at 1:45 PM Michael Walle <michael@xxxxxxxx> wrote:
> > BTW, I wonder if it has problems when unregistering gpio-regmap.
> > Call Trace of irq_domain_remove() always exits in my test:
> > https://lore.kernel.org/all/011c01d98d3d$99e6c6e0$cdb454a0$@trustnetic.com/
> >
> > Of course, it could be because there was something wrong with my
> > test code. But I want to be clear about this.
>
> Mh, you've said you don't use the devm_ variant of
> regmap_add_irq_chip(),
> correct? Do you call regmap_del_irq_chip() yourself?
>
> It seems that gpiolib is already removing the domain itself. Mh.
> I guess if the the domain is set via gpiochip_irqchip_add_domain()
> gpiolib must not call irq_domain_remove() because the domain resource
> is handled externally (i.e. gpiolib doesn't allocate the domain
> itself) in our case.
>
> Nice finding! Looks like it has been broken since the beginning
> when I've introduced the gpiochip_irqchip_add_domain(). Will you
> do another fixes patch for that? I'm not sure where to store
> that information though. Maybe a new bool "no_domain_free"
> in struct gpio_irq_chip?

While reading this I also thought about flag, but please use positive
notation, e.g. "irq_domain_is_ext".

-- 
With Best Regards,
Andy Shevchenko