Re: [PATCH] gpiolib: irq hooks: fix recursion in gpiochip_irq_unmask

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Thu, Dec 10, 2020 at 8:06 AM Nikita Shubin <nikita.shubin@xxxxxxxxxxx> wrote:

> irqchip shared with multiple gpiochips, leads to recursive call of
> gpiochip_irq_mask/gpiochip_irq_unmask which was assigned to
> rqchip->irq_mask/irqchip->irq_unmask, these happens becouse of
> only irqchip->irq_enable == gpiochip_irq_enable is checked.
>
> Let's add an additional check to make sure shared irqchip is detected
> even if irqchip->irq_enable wasn't defined.
>
> Fixes: a8173820f441 ("gpio: gpiolib: Allow GPIO IRQs to lazy disable")
> Signed-off-by: Nikita Shubin <nikita.shubin@xxxxxxxxxxx>

Good catch!
Patch applied.

Yours,
Linus Walleij