From: Cong Wang <xiyou.wangc...@gmail.com> Date: Mon, 13 Aug 2018 12:16:52 -0700
> Your fix doesn't make sense, because what ife_mod_lock protects > is absolutely not touched in BH context, they have no race. It does make sense, the problem is if you acquire ife_mod_lock and take a software interrupt while you hold it. If that software interrupt takes the tcfa_lock, we're setup for an AB-BA deadlock. And there is also no easy way to reverse the lock ordering to avoid this either. I therefore think his fix is perfectly fine and that's why I applied it.
