linux-kernel - Re: [PATCH] media: mtk-jpeg: Fix a reference count leak.

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Date:   Wed, 21 Apr 2021 15:28:42 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     wu000273@....edu, kjlu@....edu,
        Rick Chang <rick.chang@...iatek.com>,
        Bin Liu <bin.liu@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Ricky Liang <jcliang@...omium.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Minghsiu Tsai <minghsiu.tsai@...iatek.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: mtk-jpeg: Fix a reference count leak.

On Thu, 17 Sept 2020 at 13:48, Hans Verkuil <hverkuil@...all.nl> wrote:
>
> On 14/06/2020 01:08, wu000273@....edu wrote:
> > From: Qiushi Wu <wu000273@....edu>
> >
> > pm_runtime_get_sync() increments the runtime PM usage counter even
> > when it returns an error code. Thus call pm_runtime_put_noidle()
> > if pm_runtime_get_sync() fails.
> >
> > Fixes: b2f0d2724ba4 ("[media] vcodec: mediatek: Add Mediatek JPEG Decoder Driver")
> > Signed-off-by: Qiushi Wu <wu000273@....edu>
> > ---
> >  drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> > index f82a81a3bdee..097f0b050f67 100644
> > --- a/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> > +++ b/drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c
> > @@ -710,8 +710,10 @@ static int mtk_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
> >       int ret = 0;
> >
> >       ret = pm_runtime_get_sync(ctx->jpeg->dev);
> > -     if (ret < 0)
> > +     if (ret < 0) {
> > +             pm_runtime_put_noidle(ctx->jpeg->dev);
> >               goto err;
> > +     }
> >
> >       return 0;
> >  err:
> >
>
> This patch no longer applies, can you rebase this?

This patch might be harmful, might be not. Probably should be skipped
due to uncertain intentions:
https://lore.kernel.org/linux-nfs/YH+7ZydHv4+Y1hlx@kroah.com/

Best regards,
Krzysztof