linux-kernel - Re: [PATCH] drm/msm/a6xx: Fix refcount leak in a6xx_gpu

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Date:   Thu, 12 May 2022 19:29:43 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     Miaoqian Lin <linmq006@...il.com>, Rob Clark <robdclark@...il.com>,
        "Sean Paul" <sean@...rly.run>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        "Jordan Crouse" <jordan@...micpenguin.net>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/a6xx: Fix refcount leak in a6xx_gpu_init

On 5/12/2022 5:49 PM, Miaoqian Lin wrote:
> of_parse_phandle() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when not need anymore.
>
> a6xx_gmu_init() passes the node to of_find_device_by_node()
> and of_dma_configure(), of_find_device_by_node() will takes its
> reference, of_dma_configure() doesn't need the node after usage.
>
> Add missing of_node_put() to avoid refcount leak.
>
> Fixes: 4b565ca5a2cb ("drm/msm: Add A6XX device support")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
> ---
>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> index ccc4fcf7a630..a8f6d73197b1 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> @@ -1919,6 +1919,7 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>   	BUG_ON(!node);
>   
>   	ret = a6xx_gmu_init(a6xx_gpu, node);
> +	of_node_put(node);
>   	if (ret) {
>   		a6xx_destroy(&(a6xx_gpu->base.base));
>   		return ERR_PTR(ret);

Reviewed-by: Akhil P Oommen <quic_akhilpo@...cinc.com>


-Akhil.