netdev - Re: [PATCH net-next] net: sched: act_skbedit: remove dependency on rtnl lock

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Message-Id: <20180908.101800.614337846370672885.davem@davemloft.net>
Date:   Sat, 08 Sep 2018 10:18:00 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     vladbu@...lanox.com
Cc:     netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
        jiri@...nulli.us
Subject: Re: [PATCH net-next] net: sched: act_skbedit: remove dependency on
 rtnl lock

From: Vlad Buslov <vladbu@...lanox.com>
Date: Mon,  3 Sep 2018 10:07:15 +0300

> According to the new locking rule, we have to take tcf_lock for both
> ->init() and ->dump(), as RTNL will be removed.
> 
> Use tcf lock to protect skbedit action struct private data from concurrent
> modification in init and dump. Use rcu swap operation to reassign params
> pointer under protection of tcf lock. (old params value is not used by
> init, so there is no need of standalone rcu dereference step)
> 
> Remove rtnl lock assertion that is no longer required.
> 
> Signed-off-by: Vlad Buslov <vladbu@...lanox.com>

Applied.