[PATCH 6.6.y] drm/amdgpu: Handle NULL bo->tbo.resource (again) in amdgpu_vm_bo_update

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From: Michel Dänzer <mdaenzer@xxxxxxxxxx>

Third time's the charm, I hope?

Fixes: d3116756a710 ("drm/ttm: rename bo->mem and make it a pointer")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3837
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Michel Dänzer <mdaenzer@xxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
(cherry picked from commit 695c2c745e5dff201b75da8a1d237ce403600d04)
Cc: stable@xxxxxxxxxxxxxxx
(cherry picked from commit 85230ee36d88e7a09fb062d43203035659dd10a5)
---

This should apply to the 6.6 and older stable trees.

 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index f02b6232680f..2992ce494e00 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1161,10 +1161,9 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev, struct amdgpu_bo_va *bo_va,
 	 * next command submission.
 	 */
 	if (bo && bo->tbo.base.resv == vm->root.bo->tbo.base.resv) {
-		uint32_t mem_type = bo->tbo.resource->mem_type;
-
-		if (!(bo->preferred_domains &
-		      amdgpu_mem_type_to_domain(mem_type)))
+		if (bo->tbo.resource &&
+		    !(bo->preferred_domains &
+		      amdgpu_mem_type_to_domain(bo->tbo.resource->mem_type)))
 			amdgpu_vm_bo_evicted(&bo_va->base);
 		else
 			amdgpu_vm_bo_idle(&bo_va->base);
-- 
2.45.2





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