netdev - Re: [Patch net-next 1/2] net: partially revert dynamic lockdep key changes

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Date:   Thu, 30 Apr 2020 23:02:14 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Taehee Yoo <ap420073@...il.com>
Cc:     Netdev <netdev@...r.kernel.org>,
        syzbot <syzbot+aaa6fa4949cc5d9b7b25@...kaller.appspotmail.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [Patch net-next 1/2] net: partially revert dynamic lockdep key changes

On Thu, Apr 30, 2020 at 12:40 AM Taehee Yoo <ap420073@...il.com> wrote:
> > +static void vlan_dev_set_lockdep_one(struct net_device *dev,
> > +                                    struct netdev_queue *txq,
> > +                                    void *_subclass)
> > +{
> > +       lockdep_set_class_and_subclass(&txq->_xmit_lock,
> > +                                      &vlan_netdev_xmit_lock_key,
> > +                                      *(int *)_subclass);
>
> I think lockdep_set_class() is enough.
> How do you think about it?

Good catch. I overlooked this one. Is lockdep_set_class() safe
for vlan stacked on vlan?

Thanks.