linux-kernel - Re: [PATCH v3 19/24] gpio: remove unnecessary checks from gpiod_to

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Message-ID: <ZcURtLZoEftBDpsy@smile.fi.intel.com>
Date: Thu, 8 Feb 2024 19:39:00 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Kent Gibson <warthog618@...il.com>, Alex Elder <elder@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Wolfram Sang <wsa@...-dreams.de>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 19/24] gpio: remove unnecessary checks from
 gpiod_to_chip()

On Thu, Feb 08, 2024 at 10:59:15AM +0100, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> We don't need to check the gdev pointer in struct gpio_desc - it's
> always assigned and never cleared. It's also pointless to check
> gdev->chip before we actually serialize access to it.

..

>  struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
>  {
> -	if (!desc || !desc->gdev)
> +	if (!desc)

Wondering if it makes sense to align with the below and use IS_ERR_OR_NULL() check.

>  		return NULL;
>  	return desc->gdev->chip;

..

> -	if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip)
> +	if (!desc || IS_ERR(desc))

IS_ERR_OR_NULL()

>  		return -EINVAL;
>  
>  	gc = desc->gdev->chip;

-- 
With Best Regards,
Andy Shevchenko