linux-kernel - Re: [PATCH next] pmdomain: thead: Fix error pointer vs NULL bug in th1520_pd_reboot

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Message-ID: <CAPDyKFq7mwW7ys6_1wnhf+BYBeDcsxgcL5HxGhnpxv1vMO2qaA@mail.gmail.com>
Date: Fri, 26 Sep 2025 14:51:43 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Icenowy Zheng <uwu@...nowy.me>, Drew Fustini <fustini@...nel.org>, Guo Ren <guoren@...nel.org>, 
	Fu Wei <wefu@...hat.com>, linux-riscv@...ts.infradead.org, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH next] pmdomain: thead: Fix error pointer vs NULL bug in th1520_pd_reboot_init()

On Fri, 26 Sept 2025 at 06:03, Dan Carpenter <dan.carpenter@...aro.org> wrote:
>
> The devm_auxiliary_device_create() returns NULL on error.  It never
> returns error pointers.  Using PTR_ERR_OR_ZERO() here means the function
> always returns success.  Replace the PTR_ERR_OR_ZERO() call check with
> a NULL check.
>
> Fixes: 64581f41f4c4 ("pmdomain: thead: create auxiliary device for rebooting")
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Applied for next, thanks!

Kind regards
Uffe

> ---
>  drivers/pmdomain/thead/th1520-pm-domains.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pmdomain/thead/th1520-pm-domains.c b/drivers/pmdomain/thead/th1520-pm-domains.c
> index 5213994101a5..d7cb9633c7c8 100644
> --- a/drivers/pmdomain/thead/th1520-pm-domains.c
> +++ b/drivers/pmdomain/thead/th1520-pm-domains.c
> @@ -179,8 +179,10 @@ static int th1520_pd_reboot_init(struct device *dev,
>         struct auxiliary_device *adev;
>
>         adev = devm_auxiliary_device_create(dev, "reboot", aon_chan);
> +       if (!adev)
> +               return -ENODEV;
>
> -       return PTR_ERR_OR_ZERO(adev);
> +       return 0;
>  }
>
>  static int th1520_pd_probe(struct platform_device *pdev)
> --
> 2.51.0
>