linux-kernel - Re: [PATCH 1/1 net-next] net/atm/signaling.c: replace current->state by __set_current

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Message-ID: <20150223125025.61a25b4a@thirdoffive.cmf.nrl.navy.mil>
Date:	Mon, 23 Feb 2015 12:50:25 -0500
From:	chas williams - CONTRACTOR <chas@....nrl.navy.mil>
To:	Fabian Frederick <fabf@...net.be>
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	Peter Zijlstra <peterz@...radead.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1 net-next] net/atm/signaling.c: replace
 current->state by  __set_current_state()

Instead of fixing code that never gets compiled/test, you could probably
just remove the #if WAIT_FOR_DAEMON code which would get rid of this
raw assignment.

See the #undef around line 268.

On Mon, 23 Feb 2015 18:31:07 +0100
Fabian Frederick <fabf@...net.be> wrote:

> Use helper functions to access current->state.
> Direct assignments are prone to races and therefore buggy.
> 
> Thanks to Peter Zijlstra for the exact definition of the problem.
> 
> Suggested-By: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  net/atm/signaling.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/atm/signaling.c b/net/atm/signaling.c
> index 523bce7..0140832 100644
> --- a/net/atm/signaling.c
> +++ b/net/atm/signaling.c
> @@ -40,7 +40,7 @@ static void sigd_put_skb(struct sk_buff *skb)
>  		pr_debug("atmsvc: waiting for signaling daemon...\n");
>  		schedule();
>  	}
> -	current->state = TASK_RUNNING;
> +	__set_current_state(TASK_RUNNING);
>  	remove_wait_queue(&sigd_sleep, &wait);
>  #else
>  	if (!sigd) {

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