linux-kernel - Re: [PATCH 3/8] tcp: Add missing annotation for tcp_child

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Date:   Tue, 10 Mar 2020 18:14:00 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Jules Irenge <jbi.octave@...il.com>
Cc:     boqun.feng@...il.com, LKML <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 3/8] tcp: Add missing annotation for tcp_child_process()

On Tue, Mar 10, 2020 at 6:09 PM Jules Irenge <jbi.octave@...il.com> wrote:
>
> Sparse reports warning at tcp_child_process()
> warning: context imbalance in tcp_child_process() - unexpected unlock
> The root cause is the missing annotation at tcp_child_process()
>
> Add the missing __releases(&((child)->sk_lock.slock)) annotation
>
> Signed-off-by: Jules Irenge <jbi.octave@...il.com>
> ---
>  net/ipv4/tcp_minisocks.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
> index ad3b56d9fa71..0e8a5b6e477c 100644
> --- a/net/ipv4/tcp_minisocks.c
> +++ b/net/ipv4/tcp_minisocks.c
> @@ -817,6 +817,7 @@ EXPORT_SYMBOL(tcp_check_req);
>
>  int tcp_child_process(struct sock *parent, struct sock *child,
>                       struct sk_buff *skb)
> +       __releases(&((child)->sk_lock.slock))
>  {
>         int ret = 0;
>         int state = child->sk_state;


Yeah, although we prefer to use lockdep these days ;)

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