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SubjectRe: [RFT PATCH v2] gpiolib: allow gpio irqchip to map irqs dynamically
On 21/09/17 12:41, Linus Walleij wrote:
> On Fri, Sep 15, 2017 at 10:26 AM, Jerome Brunet <> 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.
Unfortunately, there is no such thing. I contemplated tracking this at
some point, and got sidetracked. In general, the irq domain and irq core
are horribly disconnected, leading to that exact line of questioning.

Jazz is not dead. It just smells funny...

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