drm/radeon: remove global vm lock

Not needed any more.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
index 44b6918..81d91b5 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -110,12 +110,10 @@
 	if (!rdev->vm_manager.enabled)
 		return;
 
-	mutex_lock(&rdev->vm_manager.lock);
 	for (i = 0; i < RADEON_NUM_VM; ++i)
 		radeon_fence_unref(&rdev->vm_manager.active[i]);
 	radeon_asic_vm_fini(rdev);
 	rdev->vm_manager.enabled = false;
-	mutex_unlock(&rdev->vm_manager.lock);
 }
 
 /**
@@ -734,7 +732,7 @@
  * Fill in the page table entries for @bo (cayman+).
  * Returns 0 for success, -EINVAL for failure.
  *
- * Object have to be reserved & global and local mutex must be locked!
+ * Object have to be reserved and mutex must be locked!
  */
 int radeon_vm_bo_update(struct radeon_device *rdev,
 			struct radeon_vm *vm,
@@ -842,12 +840,10 @@
 {
 	int r = 0;
 
-	mutex_lock(&rdev->vm_manager.lock);
 	mutex_lock(&bo_va->vm->mutex);
-	if (bo_va->soffset) {
+	if (bo_va->soffset)
 		r = radeon_vm_bo_update(rdev, bo_va->vm, bo_va->bo, NULL);
-	}
-	mutex_unlock(&rdev->vm_manager.lock);
+
 	list_del(&bo_va->vm_list);
 	mutex_unlock(&bo_va->vm->mutex);
 	list_del(&bo_va->bo_list);