Messages in this thread | | | Subject | Re: [RFT PATCH v2] gpiolib: allow gpio irqchip to map irqs dynamically | From | Marc Zyngier <> | Date | Thu, 5 Oct 2017 11:59:46 +0100 |
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On 21/09/17 12:41, Linus Walleij wrote: > 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. 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.
M. -- Jazz is not dead. It just smells funny...
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