linux-kernel - Re: [PATCH v4 2/4] gpiolib: use kref in gpio

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Date:   Thu, 20 Feb 2020 12:05:48 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Khouloud Touil <ktouil@...libre.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v4 2/4] gpiolib: use kref in gpio_desc



On 20/02/2020 10:01, Bartosz Golaszewski wrote:
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -2798,6 +2798,8 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
>   		goto done;
>   	}
>   
> +	kref_init(&desc->ref);
> +

Should we not decrement refcount on the error path of this function?

--srini

>   	if (chip->request) {
>   		/* chip->request may sleep */
>   		spin_unlock_irqrestore(&gpio_lock, flags);
> @@ -2933,6 +2935,13 @@ void gpiod_free(struct gpio_desc *desc)
>   	}
>   }