in core.c [839:854]
void icc_node_destroy(int id)
{
struct icc_node *node;
mutex_lock(&icc_lock);
node = node_find(id);
if (node) {
idr_remove(&icc_idr, node->id);
WARN_ON(!hlist_empty(&node->req_list));
}
mutex_unlock(&icc_lock);
kfree(node);
}