Re: [RFT PATCH v2] gpiolib: allow gpio irqchip to map irqs dynamically

[Linus Walleij]

On Fri, Sep 15, 2017 at 10:26 AM, Jerome Brunet <jbrunet@xxxxxxxxxxxx> wrote:

> I initially planned to do some refcounting in the gpio layer but that would make
> no sense, as you pointed out, the irq could be shared. This refcounting would
> only make sense at the irq level.
>
> On a more general note, I wonder when is it safe for a driver to dispose of the
> mapping of a possibly shared irq ? There is no way to know if the mapping is
> still used somewhere else, or am I missing something again ?

I have no idea, but maybe Marc Z or Rob H knows this?

They usually have a bit of deeper IRQ-centric knowledge.

Yours,
Linus Walleij