[PATCH] drm/amdgpu: skip update root page table

[Pan, Xinhui]

The pde is on root page table. No need to update parent's page table.

Change-Id: I2ec1015736039cf0278bdfa9bec35185ece506b5
Signed-off-by: xinhui pan <xinhui....@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index cc56eaba1911..247f328b7223 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1235,10 +1235,14 @@ static int amdgpu_vm_update_pde(struct 
amdgpu_vm_update_params *params,
                                struct amdgpu_vm_pt *entry)
 {
        struct amdgpu_vm_pt *parent = amdgpu_vm_pt_parent(entry);
-       struct amdgpu_bo *bo = parent->base.bo, *pbo;
+       struct amdgpu_bo *bo, *pbo;
        uint64_t pde, pt, flags;
        unsigned level;
 
+       if (!parent)
+               return 0;
+
+       bo = parent->base.bo;
        for (level = 0, pbo = bo->parent; pbo; ++level)
                pbo = pbo->parent;
 
-- 
2.17.1

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