linux-kernel - Re: [PATCH v9 1/6] drm: amdgpu: Allow NULL pointers at amdgpu_vm_put_task

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Message-ID: <deedc450-e349-44a5-bb9e-05eaab351983@amd.com>
Date: Tue, 17 Jun 2025 14:51:28 +0200
From: Christian König <christian.koenig@....com>
To: André Almeida <andrealmeid@...lia.com>,
 Alex Deucher <alexander.deucher@....com>, siqueira@...lia.com,
 airlied@...il.com, simona@...ll.ch, Raag Jadav <raag.jadav@...el.com>,
 rodrigo.vivi@...el.com, jani.nikula@...ux.intel.com,
 Xaver Hugl <xaver.hugl@...il.com>,
 Krzysztof Karas <krzysztof.karas@...el.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 kernel-dev@...lia.com, amd-gfx@...ts.freedesktop.org,
 intel-xe@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org
Subject: Re: [PATCH v9 1/6] drm: amdgpu: Allow NULL pointers at
 amdgpu_vm_put_task_info()

On 6/17/25 14:49, André Almeida wrote:
> Allow NULL pointers at amdgpu_vm_put_task_info() as it common practice
> for "put" or "free" functions. This avoid an extra check for NULL for
> callers.
> 
> Signed-off-by: André Almeida <andrealmeid@...lia.com>

Reviewed-by: Christian König <christian.koenig@....com>

> ---
> v9: use if (task) instead of if (ZERO_OR_NULL_PTR(task))
> v8: New patch
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 3911c78f8282..de914a39e3f6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -2447,7 +2447,8 @@ amdgpu_vm_get_vm_from_pasid(struct amdgpu_device *adev, u32 pasid)
>   */
>  void amdgpu_vm_put_task_info(struct amdgpu_task_info *task_info)
>  {
> -	kref_put(&task_info->refcount, amdgpu_vm_destroy_task_info);
> +	if (task_info)
> +		kref_put(&task_info->refcount, amdgpu_vm_destroy_task_info);
>  }
>  
>  /**