linux-kernel - Re: [PATCH 1/2] drivers: fwnode: fix fwnode_irq_get

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Message-ID: <Y1ep5zN+wifkP7v+@smile.fi.intel.com>
Date:   Tue, 25 Oct 2022 12:18:31 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>,
        Akhil R <akhilrajeev@...dia.com>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/2] drivers: fwnode: fix fwnode_irq_get_byname()

On Tue, Oct 25, 2022 at 11:50:59AM +0300, Matti Vaittinen wrote:
> The fwnode_irq_get_byname() does return 0 upon device-tree IRQ mapping
> failure. This is contradicting the function documentation and can
> potentially be a source of errors like:
> 
> int probe(...) {
> 	...
> 
> 	irq = fwnode_irq_get_byname();
> 	if (irq <= 0)
> 		return irq;
> 
> 	...
> }
> 
> Here we do correctly check the return value from fwnode_irq_get_byname()
> but the driver probe will now return success. (There was already one
> such user in-tree).
> 
> Change the fwnode_irq_get_byname() to work as documented and according to
> the common convention and abd always return a negative errno upon failure.

...

> +	ret = fwnode_irq_get(fwnode, index);

> +

Redundant blank line and better to use traditional pattern:

> +	if (!ret)
> +		return -EINVAL;
> +
> +	return ret;

	if (ret)
		return ret;

	/* We treat mapping errors as invalid case */
	return -EINVAL;

>  }

-- 
With Best Regards,
Andy Shevchenko