linux-kernel - Re: [RFC PATCH v4 3/5] gpio: gpiolib: Allow free() callback to be overridden

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Date:   Fri, 18 Mar 2022 15:15:44 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [RFC PATCH v4 3/5] gpio: gpiolib: Allow free() callback to be overridden

Hi Linus,

On Thu, Mar 17, 2022 at 1:24 AM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
>
> Allow free() callback to be overridden from irq_domain_ops for
> hierarchical chips.
>
> This allows drivers to free any resources which are allocated during
> populate_parent_alloc_arg().
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
>  drivers/gpio/gpiolib.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
Sorry to ping early, this patch and 4/5 hasn't been reviewed at all in
previous versions. So I wanted to get your feedback before I post an
non -RFC version of the series.

Cheers,
Prabhakar

> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index defb7c464b87..aede442f610d 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1187,15 +1187,18 @@ static void gpiochip_hierarchy_setup_domain_ops(struct irq_domain_ops *ops)
>         ops->activate = gpiochip_irq_domain_activate;
>         ops->deactivate = gpiochip_irq_domain_deactivate;
>         ops->alloc = gpiochip_hierarchy_irq_domain_alloc;
> -       ops->free = irq_domain_free_irqs_common;
>
>         /*
> -        * We only allow overriding the translate() function for
> +        * We only allow overriding the translate() and free() function for
>          * hierarchical chips, and this should only be done if the user
> -        * really need something other than 1:1 translation.
> +        * really need something other than 1:1 translation for translate()
> +        * callback and free if user wants to free up any resources which
> +        * were allocated during callbacks for example populate_parent_alloc_arg.
>          */
>         if (!ops->translate)
>                 ops->translate = gpiochip_hierarchy_irq_domain_translate;
> +       if (!ops->free)
> +               ops->free = irq_domain_free_irqs_common;
>  }
>
>  static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc)
> --
> 2.17.1
>