netdev - Re: [MERGE HELP] cls

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Date:   Fri, 15 Feb 2019 17:31:41 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Vlad Buslov <vladbu@...lanox.com>
Subject: Re: [MERGE HELP] cls_tcindex.c

On Fri, Feb 15, 2019 at 12:41 PM David Miller <davem@...emloft.net> wrote:
>
>
> I've merged net into net-next.
>
> The worst conflict was cls_tcindex.c as Cong's fixes collided heavily
> with Vlad's work.
>
> The interim solution I used for this merge was to revert back to RCU.
>
> Please take a look at what I did and send me followups because I am
> absolutely certain that some are necessary :-)))

Well, there is nothing fundamentally changed w.r.t. the race I have fixed.

In tcindex_delete(), after all Vlad's patches, it still calls tcf_queue_work()
therefore still races with call_rcu(). This has nothing to do with whether
it is RTNL or another mutex.

For the first memory leak, it is same, nothing changes, tcindex_delete()
still skips r->res.class==0 therefore we still need to fix it.

For the rest two memory leaks, it looks like you already merged the fix
(patch 3/3) correctly.

I will cherry-pick the first two patches for net-next and send them to you.

Thanks.