linux-kernel - Re: [PATCH] gpio: siox: indicate exclusive support of threaded IRQs

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Date:   Fri, 28 Aug 2020 00:55:09 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Thorsten Scherer <t.scherer@...elmann.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: siox: indicate exclusive support of threaded IRQs

Hi Ahmad,

On Tue, Aug 4, 2020 at 11:18 AM Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:

> Generic GPIO consumers like gpio-keys use request_any_context_irq()
> to request a threaded handler if irq_settings_is_nested_thread() ==
> true or a hardirq handler otherwise.
>
> Drivers using handle_nested_irq() must be sure that the nested
> IRQs were requested with threaded handlers, because the IRQ
> is handled by calling action->thread_fn().
>
> The gpio-siox driver dispatches IRQs via handle_nested_irq,
> but has irq_settings_is_nested_thread() == false.
>
> Set gpio_irq_chip::threaded to remedy this.
>
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

I think we concluded we want to apply this patch, but with
a fixed commit text, can you send a V2? (Or ask Uwe if he wants
to pick it up and write the text.)

Yours,
Linus Walleij