linux-kernel - Re: [PATCH 1/1] gpio: vf610: make irq

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Message-ID: <4497001.LvFx2qVVIh@steina-w>
Date:   Wed, 15 Feb 2023 12:09:32 +0100
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     andy.shevchenko@...il.com, Linus Walleij <linus.walleij@...aro.org>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] gpio: vf610: make irq_chip immutable

Am Mittwoch, 15. Februar 2023, 11:18:06 CET schrieb Linus Walleij:
> On Tue, Feb 14, 2023 at 11:52 AM <andy.shevchenko@...il.com> wrote:
> > Tue, Feb 14, 2023 at 08:36:38AM +0100, Alexander Stein kirjoitti:
> > > Since recently, the kernel is nagging about mutable irq_chips:
> > >     "not an immutable chip, please consider fixing it!"
> > > 
> > > Drop the unneeded copy, flag it as IRQCHIP_IMMUTABLE, add the new
> > > helper functions and call the appropriate gpiolib functions.
> > 
> > ...
> > 
> > > The overall changes are based on commit f1138dacb7ff
> > > ("gpio: sch: make irq_chip immutable")
> > 
> > Nice, but you forgot one crucial detail. You need to mark GPIO resuested
> > whenever it's locked as IRQ and otherwise when unlocked.
> 
> +static const struct irq_chip vf610_irqchip = {
> (...)
> +       GPIOCHIP_IRQ_RESOURCE_HELPERS,
> 
> That's what this macro does ;)

Does this mean the calls to gpiochip_disable_irq/gpiochip_enable_irq in v2/v3 
are not necessary?

Best regards,
Alexander

> Yours,
> Linus Walleij


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