linux-kernel - Re: [PATCH v2 2/2] drm/amdgpu: Clean up error handling in amdgpu_userq_fence_driver

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Message-ID: <3d8df435-a248-4f38-7a2a-b0f2ec908ae0@amd.com>
Date: Mon, 14 Apr 2025 10:08:50 +0530
From: "Yadav, Arvind" <arvyadav@....com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
 Alex Deucher <alexander.deucher@....com>
Cc: Christian König <christian.koenig@....com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@....com>,
 Arvind Yadav <Arvind.Yadav@....com>,
 Shashank Sharma <shashank.sharma@....com>, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/amdgpu: Clean up error handling in
 amdgpu_userq_fence_driver_alloc()

Reviewed-by:Arvind Yadav <arvind.yadav@....com>

On 4/12/2025 8:09 PM, Dan Carpenter wrote:
> 1) Checkpatch complains if we print an error message for kzalloc()
>     failure.  The kzalloc() failure already has it's own error messages
>     built in.  Also this allocation is small enough that it is guaranteed
>     to succeed.
> 2) Return directly instead of doing a goto free_fence_drv.  The
>     "fence_drv" is already NULL so no cleanup is necessary.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> ---
> v2: New patch
>
>   drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
> index b012fece91e8..86eab5461162 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c
> @@ -75,11 +75,8 @@ int amdgpu_userq_fence_driver_alloc(struct amdgpu_device *adev,
>   	int r;
>   
>   	fence_drv = kzalloc(sizeof(*fence_drv), GFP_KERNEL);
> -	if (!fence_drv) {
> -		DRM_ERROR("Failed to allocate memory for fence driver\n");
> -		r = -ENOMEM;
> -		goto free_fence_drv;
> -	}
> +	if (!fence_drv)
> +		return -ENOMEM;
>   
>   	/* Acquire seq64 memory */
>   	r = amdgpu_seq64_alloc(adev, &fence_drv->va, &fence_drv->gpu_addr,