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

From	Linus Walleij <linus.walleij@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [RFT PATCH v2] gpiolib: allow gpio irqchip to map irqs dynamically
Date	2017-09-21 13:50 +0200
Message-ID	<us89r-rR-17@gated-at.bofh.it> (permalink)
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On Fri, Sep 15, 2017 at 10:26 AM, Jerome Brunet <jbrunet@baylibre.com> 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

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Re: [RFT PATCH v2] gpiolib: allow gpio irqchip to map irqs  dynamically Jerome Brunet <jbrunet@baylibre.com> - 2017-09-15 10:30 +0200
  Re: [RFT PATCH v2] gpiolib: allow gpio irqchip to map irqs dynamically Linus Walleij <linus.walleij@linaro.org> - 2017-09-21 13:50 +0200

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