[PATCH 3/3] drm/amdkfd: destroy_pdds release pdd->drm_file at end

[Chen, Xiaogang]

Does this patch fix a bug or just make code look more reasonable? 
kfd_process_destroy_pdds releases pdd related buffers, not related to 
operations on vm. So vm tear down dose not affect this function.

Regards

Xiaogang

On 5/14/2025 12:10 PM, Philip Yang wrote:
> Release pdd->drm_file may free the vm if this is the last reference,
> move it to the last step after memory is unmapped.
>
> Signed-off-by: Philip Yang<Philip.Yang at amd.com>
> ---
>   drivers/gpu/drm/amd/amdkfd/kfd_process.c | 10 +++++++---
>   1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index e868cc8da46f..b009c852180d 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> @@ -1063,9 +1063,6 @@ static void kfd_process_destroy_pdds(struct kfd_process *p)
>   		kfd_process_device_destroy_cwsr_dgpu(pdd);
>   		kfd_process_device_destroy_ib_mem(pdd);
>   
> -		if (pdd->drm_file)
> -			fput(pdd->drm_file);
> -
>   		if (pdd->qpd.cwsr_kaddr && !pdd->qpd.cwsr_base)
>   			free_pages((unsigned long)pdd->qpd.cwsr_kaddr,
>   				get_order(KFD_CWSR_TBA_TMA_SIZE));
> @@ -1088,6 +1085,13 @@ static void kfd_process_destroy_pdds(struct kfd_process *p)
>   			pdd->runtime_inuse = false;
>   		}
>   
> +		/*
> +		 * This may release the vm if application already close the drm node,
> +		 * do it as last step after memory unmapped.
> +		 */
> +		if (pdd->drm_file)
> +			fput(pdd->drm_file);
> +
>   		kfree(pdd);
>   		p->pdds[i] = NULL;
>   	}
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