drm/amdgpu: WARN once if amdgpu_bo_unpin is called for an unpinned BO

It indicates a pin/unpin imbalance bug somewhere. While the bug isn't
necessarily in the call chain hitting this, it's at least one part
involved.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index fd271f9746a2..728e15e5d68a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -912,7 +912,7 @@ int amdgpu_bo_unpin(struct amdgpu_bo *bo)
         struct ttm_operation_ctx ctx = { false, false };
         int r, i;
 
-        if (!bo->pin_count) {
+        if (WARN_ON_ONCE(!bo->pin_count)) {
                 dev_warn(adev->dev, "%p unpin not necessary\n", bo);
                 return 0;
         }