linux-kernel - Re: [PATCH v2 3/4] gpio: sifive: Get the parent IRQ's domain from its irq

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Message-ID: <ZLgVPv7zdoaiUCU6@smile.fi.intel.com>
Date:   Wed, 19 Jul 2023 19:54:22 +0300
From:   Andy Shevchenko <andy@...nel.org>
To:     Samuel Holland <samuel.holland@...ive.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 3/4] gpio: sifive: Get the parent IRQ's domain from
 its irq_data

On Wed, Jul 19, 2023 at 09:34:44AM -0700, Samuel Holland wrote:
> Do not parse the devicetree again when the data is already available
> from the IRQ subsystem. This follows the example of the ThunderX and
> X-Gene GPIO drivers. The ngpio check is needed to avoid a possible
> out-of-bounds read.

...

> -	girq->parent_domain = parent;
> +	girq->parent_domain = irq_get_irq_data(chip->irq_number[0])->domain;

For the sake of readability I would like to leave parent variable
and assign it beforehand somewhere upper in the code.

Also, can irq_get_irq_data() return NULL? Needs a comment on top
of that assignment or an additional check.

-- 
With Best Regards,
Andy Shevchenko