linux-kernel - Re: [PATCH v2 3/5] gpio: gpiolib: Allow free() callback to be overridden

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Message-ID: <6eeaf18c-ac3d-1c1d-eb79-92bc508ce03c@gmail.com>
Date:   Mon, 9 May 2022 21:34:45 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...il.com>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-gpio@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 3/5] gpio: gpiolib: Allow free() callback to be
 overridden

Hello!

On 5/9/22 8:09 AM, Lad Prabhakar 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(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index b7694171655c..7be01c70ee4e 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

   Functions now?

>  	 * 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.
                                          ^ need comma here?

[...]

MBR, Sergey