netdev - Re: [PATCH 07/14] net: sched: use reference counting action init

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Message-ID: <20180515112404.GL2134@nanopsycho.orion>
Date:   Tue, 15 May 2018 13:24:04 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vlad Buslov <vladbu@...lanox.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, pablo@...filter.org,
        kadlec@...ckhole.kfki.hu, fw@...len.de, ast@...nel.org,
        daniel@...earbox.net, edumazet@...gle.com, keescook@...omium.org,
        linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, kliteyn@...lanox.com
Subject: Re: [PATCH 07/14] net: sched: use reference counting action init

Mon, May 14, 2018 at 04:27:08PM CEST, vladbu@...lanox.com wrote:
>Change action API to assume that action init function always takes
>reference to action, even when overwriting existing action. This is
>necessary because action API continues to use action pointer after init
>function is done. At this point action becomes accessible for concurrent
>modifications so user must always hold reference to it.
>
>Implement helper put list function to atomically release list of actions
>after action API init code is done using them.
>
>Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
>---
> net/sched/act_api.c | 38 +++++++++++++++++---------------------
> 1 file changed, 17 insertions(+), 21 deletions(-)
>

[...]


>@@ -1196,8 +1190,7 @@ tca_action_gd(struct net *net, struct nlattr *nla, struct nlmsghdr *n,
> 		return ret;
> 	}
> err:
>-	if (event != RTM_GETACTION)

Howcome you do this for RTM_GETACTION now too? Where is the related "get"?


>-		tcf_action_destroy(&actions, 0);
>+	tcf_action_put_lst(&actions);
> 	return ret;
> }
> 

[...]