drm/radeon: allow move_notify to be called without reservation

The few places that care should have those checks instead.
This allows destruction of bo backed memory without a reservation.
It's required for being able to rework the delayed destroy path,
as it is no longer guaranteed to hold a reservation before unlocking.

However any previous wait is still guaranteed to complete, and it's
one of the last things to be done before the buffer object is freed.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_gart.c

@@ -1237,7 +1237,6 @@ void radeon_vm_bo_invalidate(struct radeon_device *rdev,
 {
 	struct radeon_bo_va *bo_va;
 
-	BUG_ON(!radeon_bo_is_reserved(bo));
 	list_for_each_entry(bo_va, &bo->va, bo_list) {
 		bo_va->valid = false;
 	}

drivers/gpu/drm/radeon/radeon_object.c

@@ -530,7 +530,7 @@ void radeon_bo_get_tiling_flags(struct radeon_bo *bo,
 int radeon_bo_check_tiling(struct radeon_bo *bo, bool has_moved,
 				bool force_drop)
 {
-	BUG_ON(!radeon_bo_is_reserved(bo));
+	BUG_ON(!radeon_bo_is_reserved(bo) && !force_drop);
 
 	if (!(bo->tiling_flags & RADEON_TILING_SURFACE))
 		return 0;