[PATCH 1/8] drm/amdgpu: fix waiting for BO moves with CPU based PD/PT updates

[Christian König]

Otherwise we open up the possibility to use uninitialized memory.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index c70621db3bb7..44950f3b8801 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1779,13 +1779,18 @@ static int amdgpu_vm_bo_update_mapping(struct 
amdgpu_device *adev,
                if (pages_addr)
                        params.src = ~0;
 
-               /* Wait for PT BOs to be free. PTs share the same resv. object
+               /* Wait for PT BOs to be idle. PTs share the same resv. object
                 * as the root PD BO
                 */
                r = amdgpu_vm_wait_pd(adev, vm, owner);
                if (unlikely(r))
                        return r;
 
+               /* Wait for any BO move to be completed */
+               r = dma_fence_wait(exclusive, true);
+               if (unlikely(r))
+                       return r;
+
                params.func = amdgpu_vm_cpu_set_ptes;
                params.pages_addr = pages_addr;
                return amdgpu_vm_update_ptes(&params, start, last + 1,
-- 
2.17.1

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