[PATCH AUTOSEL 5.10 13/22] drm/amdgpu: install stub fence into potential unused fence pointers

[Sasha Levin]

From: Lang Yu <lang...@amd.com>

[ 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.koe...@amd.com>
Signed-off-by: Lang Yu <lang...@amd.com>
Reviewed-by: Christian König <christian.koe...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 45b1f00c59680..c19f472ec60da 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2155,6 +2155,7 @@ 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);
 
@@ -2867,7 +2868,8 @@ 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();
 
        mutex_init(&vm->eviction_lock);
@@ -3042,7 +3044,7 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, 
struct amdgpu_vm *vm,
                vm->update_funcs = &amdgpu_vm_sdma_funcs;
        }
        dma_fence_put(vm->last_update);
-       vm->last_update = NULL;
+       vm->last_update = dma_fence_get_stub();
        vm->is_compute_context = true;
 
        if (vm->pasid) {
-- 
2.39.2