2021-04-10 03:34:49

by Wangli (T)

Subject: [PATCH -next] drm/mediatek: Fix PM reference leak in mtk_crtc_ddp_hw_init()

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 <[email protected]>
Signed-off-by: Wang Li <[email protected]>
---
drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 54ab3a324752..f1954242d8f6 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -259,7 +259,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
drm_connector_list_iter_end(&conn_iter);
}

- ret = pm_runtime_get_sync(crtc->dev->dev);
+ ret = pm_runtime_resume_and_get(crtc->dev->dev);
if (ret < 0) {
DRM_ERROR("Failed to enable power domain: %d\n", ret);
return ret;
--
2.17.1

2021-04-12 15:34:03

by Chun-Kuang Hu

Subject: Re: [PATCH -next] drm/mediatek: Fix PM reference leak in mtk_crtc_ddp_hw_init()

Hi, Wang:

Wang Li <[email protected]> 於 2021年4月10日 週六 上午11:31寫道：
>
> 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.

Reviewed-by: Chun-Kuang Hu <[email protected]>

>
> Reported-by: Hulk Robot <[email protected]>
> Signed-off-by: Wang Li <[email protected]>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 54ab3a324752..f1954242d8f6 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -259,7 +259,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> drm_connector_list_iter_end(&conn_iter);
> }
>
> - ret = pm_runtime_get_sync(crtc->dev->dev);
> + ret = pm_runtime_resume_and_get(crtc->dev->dev);
> if (ret < 0) {
> DRM_ERROR("Failed to enable power domain: %d\n", ret);
> return ret;
> --
> 2.17.1
>

2021-05-14 02:17:28

by Chun-Kuang Hu

Subject: Re: [PATCH -next] drm/mediatek: Fix PM reference leak in mtk_crtc_ddp_hw_init()

Hi, Wang:

Chun-Kuang Hu <[email protected]> 於 2021年4月12日 週一 下午11:32寫道：
>
> Hi, Wang:
>
> Wang Li <[email protected]> 於 2021年4月10日 週六 上午11:31寫道：
> >
> > 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.

Applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

>
> Reviewed-by: Chun-Kuang Hu <[email protected]>
>
> >
> > Reported-by: Hulk Robot <[email protected]>
> > Signed-off-by: Wang Li <[email protected]>
> > ---
> > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index 54ab3a324752..f1954242d8f6 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -259,7 +259,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
> > drm_connector_list_iter_end(&conn_iter);
> > }
> >
> > - ret = pm_runtime_get_sync(crtc->dev->dev);
> > + ret = pm_runtime_resume_and_get(crtc->dev->dev);
> > if (ret < 0) {
> > DRM_ERROR("Failed to enable power domain: %d\n", ret);
> > return ret;
> > --
> > 2.17.1
> >