On Tue, Oct 27, 2015 at 6:54 PM, Grygorii Strashko
[off-list ref] wrote:

[Me]

quoted

Do you mean that these functions contain calls to non-atomic
functions?

Oh. No, I have to be more specific :(
if GPIOx driver defines custom .irq_(request|release)_resources() callbacks
they will *overwrite* standard GPIOirqchip callbacks.
(commit: 8b67a1f "gpio: don't override irq_*_resources() callbacks")

As result, such GPIOx driver should *re-implement* the same functionality in
its .irq_(request|release)_resources() callbacks as implemented in
gpiochip_irq_reqres()/gpiochip_irq_relres().

Yes that goes for all drivers not using gpiochip_add_irqchip().
Not everyone uses that ... and for those supplying their own
implementations of these functions.

Yours,
Linus Walleij