netdev - Re: [PATCH nf-next] netns: add and use net_ns

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Message-ID: <CAM_iQpXgrQcbrQsMVoomcsHtk4JffRjJ27FLRoignndAzFVkug@mail.gmail.com>
Date:   Mon, 12 Jun 2017 14:47:50 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        netfilter-devel@...r.kernel.org,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH nf-next] netns: add and use net_ns_barrier

On Thu, Jun 1, 2017 at 1:52 AM, Florian Westphal <fw@...len.de> wrote:
> Joe described it nicely, problem is that after unload we may have
> conntracks that still have a nf_conn_help extension attached that
> has a pointer to a structure that resided in the (unloaded) module.

Why not hold a refcnt for its module?