netdev - Re: [PATCH net] net: dsa: link interfaces with the DSA master to get rid of lockdep warnings

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Date:   Mon, 13 Jul 2020 17:48:06 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     olteanv@...il.com
Cc:     andrew@...n.ch, netdev@...r.kernel.org, f.fainelli@...il.com,
        vivien.didelot@...il.com, xiyou.wangcong@...il.com,
        ap420073@...il.com
Subject: Re: [PATCH net] net: dsa: link interfaces with the DSA master to
 get rid of lockdep warnings

From: Vladimir Oltean <olteanv@...il.com>
Date: Mon, 13 Jul 2020 20:42:27 +0300

> One difference from VLAN is that in that case, the entire
> register_vlan_device() function runs under RTNL.
> When those bugs that you talk about are found, who starts using the
> network interface too early? User space or someone else? Would RTNL be
> enough to avoid that?

As soon as the notifier is emitted by register_netdev(), userspace
like components such as NetworkManager can and do ifup the device
immediately.