netdev - Re: Correct usage of dev_base

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Message-ID: <20201130202626.cnwzvzc6yhd745si@skbuf>
Date:   Mon, 30 Nov 2020 22:26:26 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        netdev <netdev@...r.kernel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Jiri Benc <jbenc@...hat.com>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: Correct usage of dev_base_lock in 2020

On Mon, Nov 30, 2020 at 12:21:29PM -0800, Stephen Hemminger wrote:
> if device is in a private list (in bond device), the way to handle
> this is to use dev_hold() to keep a ref count.

Correct, dev_hold is a tool that can also be used. But it is a tool that
does not solve the general problem - only particular ones. See the other
interesting callers of dev_get_stats in parisc, appldata, net_failover.
We can't ignore that RTNL is used for write-side locking forever.