netdev - Re: [PATCH net-next v2] net: remove unused netdev

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Date:   Wed, 28 Sep 2022 16:44:33 +0900
From:   Juhee Kang <claudiajkang@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Simon Horman <simon.horman@...igine.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH net-next v2] net: remove unused netdev_unregistering()

Hi Eric,
Thank you for your review!

On Thu, Sep 29, 2022 at 1:35 AM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Wed, Sep 28, 2022 at 9:17 AM Juhee Kang <claudiajkang@...il.com> wrote:
> >
> > A helper function which is netdev_unregistering on nedevice.h is
> > no loger used. Thus, netdev_unregistering removes from netdevice.h.
> >
>
> I think we could explain a bit more why we think this function was not
> really needed.
>
> It was added in commit 8397ed36b7c5 ("net: ipv6: Release route when
> device is unregistering")
> then later, commit 27c6fa73f93b ("ipv6: Set nexthop flags upon carrier
> change") removed the
> only user of this helper. The only possible/valid case where we access
> dev->reg_state
> is in notifiers, and notifiers already have access to the 'event',
> being NETDEV_UNREGISTER
> or NETDEV_DOWN...
>

I will send you a next patch after changing it according to your advice.

>
> > Signed-off-by: Juhee Kang <claudiajkang@...il.com>
> > ---
> > v2:
> >  - v1 link : https://lore.kernel.org/netdev/20220923160937.1912-1-claudiajkang@gmail.com/
> >  - Remove netdev_unregistering().
> >
> >  include/linux/netdevice.h | 5 -----
> >  1 file changed, 5 deletions(-)
> >
> > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > index 9f42fc871c3b..66d10bcaa6f8 100644
> > --- a/include/linux/netdevice.h
> > +++ b/include/linux/netdevice.h
> > @@ -5100,11 +5100,6 @@ static inline const char *netdev_name(const struct net_device *dev)
> >         return dev->name;
> >  }
> >
> > -static inline bool netdev_unregistering(const struct net_device *dev)
> > -{
> > -       return dev->reg_state == NETREG_UNREGISTERING;
> > -}
> > -
> >  static inline const char *netdev_reg_state(const struct net_device *dev)
> >  {
> >         switch (dev->reg_state) {
> > --
> > 2.34.1
> >