netdev - Re: [PATCH net-next] tcp: fix a lockdep issue in tcp_fastopen_reset

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Date:   Thu, 02 Nov 2017 12:55:06 -0700
From:   Christoph Paasch <cpaasch@...le.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Yuchung Cheng <ycheng@...gle.com>
Subject: Re: [PATCH net-next] tcp: fix a lockdep issue in
 tcp_fastopen_reset_cipher()

On 02/11/17 - 11:53:04, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> icsk_accept_queue.fastopenq.lock is only fully initialized at listen()
> time.
> 
> LOCKDEP is not happy if we attempt a spin_lock_bh() on it, because
> of missing annotation. (Although kernel runs just fine)
> 
> Lets use net->ipv4.tcp_fastopen_ctx_lock to protect ctx access.
> 
> Fixes: 1fba70e5b6be ("tcp: socket option to set TCP fast open key")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Yuchung Cheng <ycheng@...gle.com>
> Cc: Christoph Paasch <cpaasch@...le.com>
> ---
>  net/ipv4/tcp_fastopen.c |    8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)

Reviewed-by: Christoph Paasch <cpaasch@...le.com>