linux-kernel - Re: [PATCH] drm/msm/adreno: Fix a reference leak in a6xx_gpu

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Message-ID: <e62971cd-ed56-46a3-ab47-46f3523ceeff@oss.qualcomm.com>
Date: Fri, 23 Jan 2026 20:23:23 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Felix Gu <ustc.gu@...il.com>
Cc: Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Akhil P Oommen <akhilpo@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar
 <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        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/adreno: Fix a reference leak in a6xx_gpu_init()

On 23/01/2026 20:21, Felix Gu wrote:
> Hi Dmitry,
> Thanks for your review.
> linux/cleanup.h is included in linux/of.h.
> So it should be included already.

Yes. However we should not depend on include files being provided by 
other kernel-wide includes.

Also, please don't top-post when replying to the emails on public MLs.

> 
> Best regards,
> Feix Gu
> 
> On Sat, Jan 24, 2026 at 1:58 AM Dmitry Baryshkov
> <dmitry.baryshkov@....qualcomm.com> wrote:
>>
>> On Sat, Jan 24, 2026 at 12:37:38AM +0800, Felix Gu wrote:
>>> In a6xx_gpu_init(), node is obtained via of_parse_phandle().
>>> While there was a manual of_node_put() at the end of the
>>> common path, several early error returns would bypass this call,
>>> resulting in a reference leak.
>>> Fix this by using the __free(device_node) cleanup handler to
>>> release the reference when the variable goes out of scope.
>>>
>>> Fixes: 5a903a44a984 ("drm/msm/a6xx: Introduce GMU wrapper support")
>>> Signed-off-by: Felix Gu <ustc.gu@...il.com>
>>> ---
>>>   drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 5 ++---
>>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>>> index 2129d230a92b..0bc518d9fd65 100644
>>> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
>>> @@ -2640,7 +2640,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>>>        struct msm_drm_private *priv = dev->dev_private;
>>>        struct platform_device *pdev = priv->gpu_pdev;
>>>        struct adreno_platform_config *config = pdev->dev.platform_data;
>>> -     struct device_node *node;
>>>        struct a6xx_gpu *a6xx_gpu;
>>>        struct adreno_gpu *adreno_gpu;
>>>        struct msm_gpu *gpu;
>>> @@ -2660,7 +2659,8 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>>>        adreno_gpu->registers = NULL;
>>>
>>>        /* Check if there is a GMU phandle and set it up */
>>> -     node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
>>> +     struct device_node *node __free(device_node) =
>>> +             of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
>>
>> Missing include for cleanup.h.
>>
>>>        /* FIXME: How do we gracefully handle this? */
>>>        BUG_ON(!node);
>>>
>>> @@ -2702,7 +2702,6 @@ static struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
>>>                ret = a6xx_gmu_wrapper_init(a6xx_gpu, node);
>>>        else
>>>                ret = a6xx_gmu_init(a6xx_gpu, node);
>>> -     of_node_put(node);
>>>        if (ret) {
>>>                a6xx_destroy(&(a6xx_gpu->base.base));
>>>                return ERR_PTR(ret);
>>>
>>> ---
>>> base-commit: a0c666c25aeefd16f4b088c6549a6fb6b65a8a1d
>>> change-id: 20260123-a6xx_gpu-cbc095dbe423
>>>
>>> Best regards,
>>> --
>>> Felix Gu <ustc.gu@...il.com>
>>>
>>
>> --
>> With best wishes
>> Dmitry


-- 
With best wishes
Dmitry