linux-kernel - Re: [PATCH 2/4] media: davinci: vpif: fix unbalanced runtime PM enable

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Message-ID: <CA+V-a8thJtWjL+2-TNdbZTe=hKCVYz2vwAL-uCNeW+-TmVKPVg@mail.gmail.com>
Date:   Tue, 4 Jan 2022 18:11:08 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Kevin Hilman <khilman@...libre.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [PATCH 2/4] media: davinci: vpif: fix unbalanced runtime PM enable

Hi Johan,

Thank you for the patch.

On Wed, Dec 22, 2021 at 2:20 PM Johan Hovold <johan@...nel.org> wrote:
>
> Make sure to disable runtime PM before returning on probe errors.
>
> Fixes: 479f7a118105 ("[media] davinci: vpif: adaptions for DT support")
> Cc: stable@...r.kernel.org      # 4.12: 4024d6f601e3c
> Cc: Kevin Hilman <khilman@...libre.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
>  drivers/media/platform/davinci/vpif.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/davinci/vpif.c b/drivers/media/platform/davinci/vpif.c
> index 9752a5ec36f7..1f5eacf48580 100644
> --- a/drivers/media/platform/davinci/vpif.c
> +++ b/drivers/media/platform/davinci/vpif.c
> @@ -428,6 +428,7 @@ static int vpif_probe(struct platform_device *pdev)
>         static struct resource *res_irq;
>         struct platform_device *pdev_capture, *pdev_display;
>         struct device_node *endpoint = NULL;
> +       int ret;
>
>         vpif_base = devm_platform_ioremap_resource(pdev, 0);
>         if (IS_ERR(vpif_base))
> @@ -456,8 +457,8 @@ static int vpif_probe(struct platform_device *pdev)
>         res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>         if (!res_irq) {
>                 dev_warn(&pdev->dev, "Missing IRQ resource.\n");
> -               pm_runtime_put(&pdev->dev);
Maybe just add pm_runtime_disable(&pdev->dev); here, rest diff won't
be required.

Cheers,
Prabhakar

> -               return -EINVAL;
> +               ret = -EINVAL;
> +               goto err_put_rpm;
>         }
>
>         pdev_capture = devm_kzalloc(&pdev->dev, sizeof(*pdev_capture),
> @@ -491,6 +492,12 @@ static int vpif_probe(struct platform_device *pdev)
>         }
>
>         return 0;
> +
> +err_put_rpm:
> +       pm_runtime_put(&pdev->dev);
> +       pm_runtime_disable(&pdev->dev);
> +
> +       return ret;
>  }
>
>  static int vpif_remove(struct platform_device *pdev)
> --
> 2.32.0
>