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Cc:     Navid Emamdoost <emamd001@umn.edu>, Kangjie Lu <kjlu@umn.edu>,
        Stephen McCamant <smccaman@umn.edu>,
        Qiushi Wu <wu000273@umn.edu>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
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        Linus Walleij <linus.walleij@linaro.org>,
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Subject: Re: [PATCH] gpio: arizona: put pm_runtime in case of failure
From:   Markus Elfring <Markus.Elfring@web.de>
To:     Navid Emamdoost <navid.emamdoost@gmail.com>,
        linux-gpio@vger.kernel.org, patches@opensource.cirrus.com
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Message-ID: <11488e76-2ea0-6478-0800-deb0438f0136@web.de>
Date:   Fri, 5 Jun 2020 14:14:38 +0200
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I recommend to replace the word =E2=80=9Cpm_runtime=E2=80=9D by the
alternative =E2=80=9CPM run time system=E2=80=9D in the patch subject.


> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count if pm_runtime_put is not called in
> error handling paths.

Should the term =E2=80=9Creference count=E2=80=9D be used here?


> Call pm_runtime_put if pm_runtime_get_sync fails.

The diff hunks show an other function name.


=E2=80=A6
> +++ b/drivers/gpio/gpio-arizona.c
> @@ -64,6 +64,7 @@  static int arizona_gpio_get(struct gpio_chip *chip, u=
nsigned offset)
>  		ret =3D pm_runtime_get_sync(chip->parent);
>  		if (ret < 0) {
>  			dev_err(chip->parent, "Failed to resume: %d\n", ret);
> +			pm_runtime_put_autosuspend(chip->parent);
>  			return ret;
>  		}

You propose to use identical statements in three if branches.
Please add a corresponding jump target for better exception handling.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Do=
cumentation/process/coding-style.rst?id=3D435faf5c218a47fd6258187f62d9bb10=
09717896#n455


Would you like to add the tag =E2=80=9CFixes=E2=80=9D to the commit messag=
e?


I find it amazing how many questionable implementation details
you pointed out recently.
Were these contributions triggered by an evolving source code analysis
tool like CheQ?
https://github.com/umnsec/cheq/

Regards,
Markus