[PATCH] drm/kfd: fix ttm_bo_release warning

[Lang Yu <lang.yu@amd.com>]

If a BO is pinned, unpin it before freeing it.

Call Trace:
	ttm_bo_put+0x30/0x50 [ttm]
	amdgpu_bo_unref+0x1e/0x30 [amdgpu]
	amdgpu_gem_object_free+0x34/0x50 [amdgpu]
	drm_gem_object_free+0x1d/0x30 [drm]
	amdgpu_amdkfd_gpuvm_free_memory_of_gpu+0x31f/0x3a0 [amdgpu]
	kfd_process_device_free_bos+0xa3/0xf0 [amdgpu]
	kfd_process_wq_release+0x224/0x2e0 [amdgpu]
	process_one_work+0x220/0x3c0
	worker_thread+0x4d/0x3f0
	kthread+0x114/0x150
	process_one_work+0x3c0/0x3c0
	kthread_park+0x90/0x90
	ret_from_fork+0x22/0x30

Signed-off-by: Lang Yu <lang.yu@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 2d6b2d77b738..7e693b064072 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1567,6 +1567,9 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
 	pr_debug("Release VA 0x%llx - 0x%llx\n", mem->va,
 		mem->va + bo_size * (1 + mem->aql_queue));
 
+	if (mem->bo->tbo.pin_count)
+		amdgpu_bo_unpin(mem->bo);
+
 	ret = unreserve_bo_and_vms(&ctx, false, false);
 
 	/* Remove from VM internal data structures */
-- 
2.25.1