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From:   Robert Foss <robert.foss@linaro.org>
Date:   Mon, 31 May 2021 15:52:39 +0200
Message-ID: <CAG3jFyuSheggFGh-6+H7EypHbb7pO=XcsiAYtS5DxB2HdBwt=g@mail.gmail.com>
Subject: Re: [PATCH v2] drm: bridge: cdns-mhdp8546: Fix PM reference leak in
To:     Yu Kuai <yukuai3@huawei.com>
Cc:     Andrzej Hajda <a.hajda@samsung.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        linux-kernel <linux-kernel@vger.kernel.org>, yi.zhang@huawei.com
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Added r-b tag and merged to drm-misc next.

https://cgit.freedesktop.org/drm/drm-misc/log/?h=drm-misc-next

Thanks for the submission, and sorry about making you jump through all
those hoops.

On Mon, 31 May 2021 at 15:47, Yu Kuai <yukuai3@huawei.com> wrote:
>
> pm_runtime_get_sync will increment pm usage counter even it failed.
> Forgetting to putting operation will result in reference leak here.
> Fix it by replacing it with pm_runtime_resume_and_get to keep usage
> counter balanced.
>
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
> ---
> changes in V2:
>  - change error message.
>
>  drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index 0cd8f40fb690..eab959a59214 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -2478,9 +2478,9 @@ static int cdns_mhdp_probe(struct platform_device *pdev)
>         clk_prepare_enable(clk);
>
>         pm_runtime_enable(dev);
> -       ret = pm_runtime_get_sync(dev);
> +       ret = pm_runtime_resume_and_get(dev);
>         if (ret < 0) {
> -               dev_err(dev, "pm_runtime_get_sync failed\n");
> +               dev_err(dev, "pm_runtime_resume_and_get failed\n");
>                 pm_runtime_disable(dev);
>                 goto clk_disable;
>         }
> --
> 2.31.1
>