linux-kernel - Re: [PATCH v1 05/10] gpio: pca953x: Simplify code with cleanup helpers

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Date:   Wed, 13 Sep 2023 16:35:38 +0200 (CEST)
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v1 05/10] gpio: pca953x: Simplify code with cleanup
 helpers

 	Hi Andy,

On Fri, 1 Sep 2023, Andy Shevchenko wrote:
> Use macros defined in linux/cleanup.h to automate resource lifetime
> control in gpio-pca953x.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Thanks for your patch, which is now commit 8e471b784a720f6f
("gpio: pca953x: Simplify code with cleanup helpers") in
gpio/gpio/for-next.

> --- a/drivers/gpio/gpio-pca953x.c
> +++ b/drivers/gpio/gpio-pca953x.c
> @@ -557,9 +554,8 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
> 	u32 reg_val;
> 	int ret;
>
> -	mutex_lock(&chip->i2c_lock);
> -	ret = regmap_read(chip->regmap, inreg, &reg_val);
> -	mutex_unlock(&chip->i2c_lock);
> +	scoped_guard(mutex, &chip->i2c_lock)
> +		ret = regmap_read(chip->regmap, inreg, &reg_val);

I can't say I'm thrilled about the lack of curly braces.  I was also
surprised to discover that checkpatch nor gcc W=1 complain about the
indentation change.
I know we don't use curly braces in single-statement for_each_*() loops,
but at least these have the familiar "for"-prefix.  And having the scope
is very important here, so using braces, this would stand out more.

Hence can we please get curly braces, like

     scoped_guard(mutex, &chip->i2c_lock) {
 	    ret = regmap_read(chip->regmap, inreg, &reg_val);
     }

?

Thanks! ;-)

Gr{oetje,eeting}s,

 						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
 							    -- Linus Torvalds