Patch "drm/amdgpu: install stub fence into potential unused fence pointers" has been added to the 6.4-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amdgpu: install stub fence into potential unused fence pointers

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-install-stub-fence-into-potential-unused-.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit b09cf57499781ce8c1e6970b4e5dea84113d5c07
Author: Lang Yu <Lang.Yu@xxxxxxx>
Date:   Fri May 5 20:14:15 2023 +0800

    drm/amdgpu: install stub fence into potential unused fence pointers
    
    [ Upstream commit 187916e6ed9d0c3b3abc27429f7a5f8c936bd1f0 ]
    
    When using cpu to update page tables, vm update fences are unused.
    Install stub fence into these fence pointers instead of NULL
    to avoid NULL dereference when calling dma_fence_wait() on them.
    
    Suggested-by: Christian König <christian.koenig@xxxxxxx>
    Signed-off-by: Lang Yu <Lang.Yu@xxxxxxx>
    Reviewed-by: Christian König <christian.koenig@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 23f52150ebef4..fd029d91a3402 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1367,6 +1367,7 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev,
 	amdgpu_vm_bo_base_init(&bo_va->base, vm, bo);
 
 	bo_va->ref_count = 1;
+	bo_va->last_pt_update = dma_fence_get_stub();
 	INIT_LIST_HEAD(&bo_va->valids);
 	INIT_LIST_HEAD(&bo_va->invalids);
 
@@ -2088,7 +2089,8 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 		vm->update_funcs = &amdgpu_vm_cpu_funcs;
 	else
 		vm->update_funcs = &amdgpu_vm_sdma_funcs;
-	vm->last_update = NULL;
+
+	vm->last_update = dma_fence_get_stub();
 	vm->last_unlocked = dma_fence_get_stub();
 	vm->last_tlb_flush = dma_fence_get_stub();
 
@@ -2213,7 +2215,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 		goto unreserve_bo;
 
 	dma_fence_put(vm->last_update);
-	vm->last_update = NULL;
+	vm->last_update = dma_fence_get_stub();
 	vm->is_compute_context = true;
 
 	/* Free the shadow bo for compute VM */



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