linux-kernel - Re: [PATCH] drm/panfrost: fix ref count leak in panfrost_job_hw

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Date:   Mon, 6 Jul 2020 22:31:28 -0400
From:   Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     Rob Herring <robh@...nel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Steven Price <steven.price@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        emamd001@....edu, wu000273@....edu, kjlu@....edu, smccaman@....edu
Subject: Re: [PATCH] drm/panfrost: fix ref count leak in
 panfrost_job_hw_submit

Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>

On Sun, Jun 14, 2020 at 01:27:30AM -0500, Navid Emamdoost wrote:
> in panfrost_job_hw_submit, 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/panfrost/panfrost_job.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index 7914b1570841..89ac84667eb1 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -147,11 +147,10 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
>  
>  	ret = pm_runtime_get_sync(pfdev->dev);
>  	if (ret < 0)
> -		return;
> +		goto out;
>  
>  	if (WARN_ON(job_read(pfdev, JS_COMMAND_NEXT(js)))) {
> -		pm_runtime_put_sync_autosuspend(pfdev->dev);
> -		return;
> +		goto out;
>  	}
>  
>  	cfg = panfrost_mmu_as_get(pfdev, &job->file_priv->mmu);
> @@ -184,6 +183,9 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
>  				job, js, jc_head);
>  
>  	job_write(pfdev, JS_COMMAND_NEXT(js), JS_COMMAND_START);
> +out:
> +	pm_runtime_put_sync_autosuspend(pfdev->dev);
> +	return;
>  }
>  
>  static void panfrost_acquire_object_fences(struct drm_gem_object **bos,
> -- 
> 2.17.1
>