Re: gpio irqchip initialization race

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Apr 1, 2016 at 10:43 AM, Linus Walleij <linus.walleij@xxxxxxxxxx> wrote:

> I think the problem is that gpio-keys is calling gpio_to_irq(), and at that
> point between gpiochip_add_data() but before gpiochip_irqchip_add()
> it gets a bogus IRQ when it should be getting -EPROBE_DEFER.

Or not a bogus irqnumber really, it get -ENXIO (-6)
as in your example:

> gpio-keys user_sw: Unable to get irq number for GPIO 376, error -6

And in this case (if gpio_keys handle -EPROBE_DEFER gracefully)
all should be fine with my oneliner patch.

I am more uncertain about the -EINVAL (-22) we might need some
more analysis there.

Yours,
Linus Walleij
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