From: Samuel Holland <samuel.holland@sifive.com>
To: Andy Shevchenko <andy@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <brgl@bgdev.pl>,
Emil Renner Berthing <emil.renner.berthing@canonical.com>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH v2 3/4] gpio: sifive: Get the parent IRQ's domain from its irq_data
Date: Wed, 19 Jul 2023 12:03:46 -0500 [thread overview]
Message-ID: <a3c4f1c6-444b-b3a2-c952-bdd5b0463f95@sifive.com> (raw)
In-Reply-To: <ZLgVPv7zdoaiUCU6@smile.fi.intel.com>
On 2023-07-19 11:54 AM, Andy Shevchenko wrote:
> 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.
OK.
> Also, can irq_get_irq_data() return NULL? Needs a comment on top
> of that assignment or an additional check.
No, the earlier loop already verified the IRQ number was valid. I don't think it
can later become invalid. In any case, we already dereference the result of
irq_get_irq_data(irq_number[foo]) in sifive_gpio_child_to_parent_hwirq().
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next prev parent reply other threads:[~2023-07-19 17:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-19 16:34 [PATCH v2 0/4] gpio: sifive: Module support Samuel Holland
2023-07-19 16:34 ` [PATCH v2 1/4] gpio: sifive: Directly use the device's fwnode Samuel Holland
2023-07-19 16:44 ` Andy Shevchenko
2023-07-19 16:34 ` [PATCH v2 2/4] gpio: sifive: Look up IRQs only once during probe Samuel Holland
2023-07-19 16:48 ` Andy Shevchenko
2023-07-19 16:55 ` Samuel Holland
2023-07-19 16:34 ` [PATCH v2 3/4] gpio: sifive: Get the parent IRQ's domain from its irq_data Samuel Holland
2023-07-19 16:54 ` Andy Shevchenko
2023-07-19 17:03 ` Samuel Holland [this message]
2023-07-19 17:21 ` Andy Shevchenko
2023-07-19 16:34 ` [PATCH v2 4/4] gpio: sifive: Allow building the driver as a module Samuel Holland
2023-07-19 16:54 ` Andy Shevchenko
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