[PATCH 1/1] drm/amdgpu: Set vmbo destroy after pt bo is created

[Philip Yang]

Under VRAM usage pression, map to GPU may fail to create pt bo and
vmbo->shadow_list is not initialized, then ttm_bo_release calling
amdgpu_bo_vm_destroy to access vmbo->shadow_list generates below
dmesg and NULL pointer access backtrace:

Set vmbo destroy callback to amdgpu_bo_vm_destroy only after creating pt
bo successfully, otherwise use default callback amdgpu_bo_destroy.

amdgpu: amdgpu_vm_bo_update failed
amdgpu: update_gpuvm_pte() failed
amdgpu: Failed to map bo to gpuvm
amdgpu 0000:43:00.0: amdgpu: Failed to map peer:0000:43:00.0 mem_domain:2
BUG: kernel NULL pointer dereference, address:
 RIP: 0010:amdgpu_bo_vm_destroy+0x4d/0x80 [amdgpu]
 Call Trace:
  <TASK>
  ttm_bo_release+0x207/0x320 [amdttm]
  amdttm_bo_init_reserved+0x1d6/0x210 [amdttm]
  amdgpu_bo_create+0x1ba/0x520 [amdgpu]
  amdgpu_bo_create_vm+0x3a/0x80 [amdgpu]
  amdgpu_vm_pt_create+0xde/0x270 [amdgpu]
  amdgpu_vm_ptes_update+0x63b/0x710 [amdgpu]
  amdgpu_vm_update_range+0x2e7/0x6e0 [amdgpu]
  amdgpu_vm_bo_update+0x2bd/0x600 [amdgpu]
  update_gpuvm_pte+0x160/0x420 [amdgpu]
  amdgpu_amdkfd_gpuvm_map_memory_to_gpu+0x313/0x1130 [amdgpu]
  kfd_ioctl_map_memory_to_gpu+0x115/0x390 [amdgpu]
  kfd_ioctl+0x24a/0x5b0 [amdgpu]

Signed-off-by: Philip Yang <Philip.Yang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 4570ad449390..ae924db72b62 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -688,11 +688,11 @@ int amdgpu_bo_create_vm(struct amdgpu_device *adev,
 	 * num of amdgpu_vm_pt entries.
 	 */
 	BUG_ON(bp->bo_ptr_size < sizeof(struct amdgpu_bo_vm));
-	bp->destroy = &amdgpu_bo_vm_destroy;
 	r = amdgpu_bo_create(adev, bp, &bo_ptr);
 	if (r)
 		return r;
 
+	bo_ptr->tbo.destroy = &amdgpu_bo_vm_destroy;
 	*vmbo_ptr = to_amdgpu_bo_vm(bo_ptr);
 	INIT_LIST_HEAD(&(*vmbo_ptr)->shadow_list);
 	return r;
-- 
2.35.1