Re: [PATCH v7 5/8] gpio: sim: new testing module

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: "Joel Becker" <jlbec@evilplan.org>,
	"Christoph Hellwig" <hch@lst.de>, "Shuah Khan" <shuah@kernel.org>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	"Kent Gibson" <warthog618@gmail.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Jack Winch" <sunt.un.morcov@gmail.com>,
	"Viresh Kumar" <viresh.kumar@linaro.org>,
	linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org,
	"Colin Ian King" <colin.king@canonical.com>
Subject: Re: [PATCH v7 5/8] gpio: sim: new testing module
Date: Mon, 18 Oct 2021 13:40:18 +0300	[thread overview]
Message-ID: <YW1PEvTyqdhiRYR6@smile.fi.intel.com> (raw)
In-Reply-To: <20211008081739.26807-6-brgl@bgdev.pl>

On Fri, Oct 08, 2021 at 10:17:36AM +0200, Bartosz Golaszewski wrote:
> Implement a new, modern GPIO testing module controlled by configfs
> attributes instead of module parameters. The goal of this driver is
> to provide a replacement for gpio-mockup that will be easily extensible
> with new features and doesn't require reloading the module to change
> the setup.
> 
> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
> [Andy: Initialize attribute allocated on the heap]
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> [Colin: Fix dereference of free'd pointer config]
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Some nit-picks below, up to you to address.

...

> +	ret = gpio_sim_setup_sysfs(chip);
> +	if (ret)
> +		return ret;
> +
> +	return 0;

return gpio_sim_...(chip); ?

...

> +

Redundant empty line.

> +CONFIGFS_ATTR_RO(gpio_sim_config_, dev_name);

...

> +

Ditto.

> +CONFIGFS_ATTR_RO(gpio_sim_config_, chip_name);

...

> +

Ditto.

> +CONFIGFS_ATTR(gpio_sim_config_, label);

...

> +

Ditto.

> +CONFIGFS_ATTR(gpio_sim_config_, num_lines);

...

> +

Ditto.

> +CONFIGFS_ATTR(gpio_sim_config_, line_names);

...

> +	fwnode = fwnode_create_software_node(properties, NULL);
> +	if (IS_ERR(fwnode))
> +		return PTR_ERR(fwnode);

> +	fwnode = dev_fwnode(&config->pdev->dev);
> +	platform_device_unregister(config->pdev);
> +	fwnode_remove_software_node(fwnode);

This seems correct, thank you for modifying the code.

...

> +	config->pdev = NULL;
> +	mutex_unlock(&config->lock);

mutex_destroy() ?
Or is it done in the upper level?

-- 
With Best Regards,
Andy Shevchenko