netdev - Re: [net-next PATCH] tcp: remove useless assignment statement in tcp_keepalive

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Date:	Mon, 22 Aug 2011 13:46:13 +0300
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	Li Yu <raise.sail@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [net-next PATCH] tcp: remove useless assignment statement in tcp_keepalive_timer

No, if the condition afterwards evaluates to TRUE, and we go to the label 
resched, inet_csk_reset_keepalive_timer(...) is called without elapsed being 
set.

Cheers,
Christoph

On Monday 22 August 2011 wrote Li Yu:
> Remove useless assignment statement, it may be trash after refactoring?
> 
> Signed-off-by: Li Yu <raise.sail@...il.com>
> diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
> index ecd44b0..321ff2f 100644
> --- a/net/ipv4/tcp_timer.c
> +++ b/net/ipv4/tcp_timer.c
> @@ -552,8 +552,6 @@ static void tcp_keepalive_timer (unsigned long data)
>  	if (!sock_flag(sk, SOCK_KEEPOPEN) || sk->sk_state == TCP_CLOSE)
>  		goto out;
> 
> -	elapsed = keepalive_time_when(tp);
> -
>  	/* It is alive without keepalive 8) */
>  	if (tp->packets_out || tcp_send_head(sk))
>  		goto resched;
> 
> --
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--
Christoph Paasch
PhD Student

IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://inl.info.ucl.ac.be/mptcp
Université Catholique de Louvain

www.rollerbulls.be
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