linux-kernel - Re: [PATCH] drm/exynos: fix ref count leak in mic_pre

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Date:   Mon, 15 Jun 2020 00:50:24 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Inki Dae <inki.dae@...sung.com>
Cc:     Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Navid Emamdoost <emamd001@....edu>,
        Qiushi Wu <wu000273@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>
Subject: Re: [PATCH] drm/exynos: fix ref count leak in mic_pre_enable

On Sun, Jun 14, 2020 at 7:47 PM Inki Dae <inki.dae@...sung.com> wrote:
>
> Hi,
>
> 20. 6. 14. 오후 3:23에 Navid Emamdoost 이(가) 쓴 글:
> > in mic_pre_enable, pm_runtime_get_sync is called which
> > increments the counter even in case of failure, leading to incorrect
> > ref count. In case of failure, decrement the ref count before returning.
> >
> > Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> > ---
> >  drivers/gpu/drm/exynos/exynos_drm_mic.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> > index a86abc173605..69ff74c2ceb5 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> > @@ -270,7 +270,7 @@ static void mic_pre_enable(struct drm_bridge *bridge)
> >
> >       ret = pm_runtime_get_sync(mic->dev);
> >       if (ret < 0)
> > -             goto unlock;
> > +             goto turn_off;
>
> How about just calling pm_runtime_put_noidle()?
>
> if (ret < 0) {
>         pm_runtime_put_noidle(mic->dev);
>         goto unlock;
> }
>
v2 was sent.

> Thanks,
> Inki Dae
>
> >
> >       mic_set_path(mic, 1);
> >
> >



-- 
Navid.