netdev - Re: [PATCH net-next v2] net/socket: use per af lockdep classes for sk queues

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Date:   Thu, 09 Mar 2017 08:39:14 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Florian Westphal <fw@...len.de>
Subject: Re: [PATCH net-next v2] net/socket: use per af lockdep classes for
 sk queues

On Thu, 2017-03-09 at 13:54 +0100, Paolo Abeni wrote:
> Currently the sock queue's spin locks get their lockdep
> classes by the default init_spin_lock() initializer:
> all socket families get - usually, see below - a single
> class for rx, another specific class for tx, etc.
> This can lead to false positive lockdep splat, as
> reported by Andrey.
> Moreover there are two separate initialization points
> for the sock queues, one in sk_clone_lock() and one
> in sock_init_data(), so that e.g. the rx queue lock
> can get one of two possible, different classes, depending
> on the socket being cloned or not.
> This change tries to address the above, setting explicitly
> a per address family lockdep class for each queue's
> spinlock. Also, move the duplicated initialization code to a
> single location.

Acked-by: Eric Dumazet <edumazet@...gle.com>