netdev - Re: [PATCH] net : fix for dst_gc_task not getting scheduled if __dst

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Date:	Sat, 19 May 2012 12:04:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	b15745@...escale.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] net : fix for dst_gc_task not getting scheduled if
 __dst_free() is called consistently

On Sat, 2012-05-19 at 04:44 -0500, b15745@...escale.com wrote:
> From: Rajan Gupta <b15745@...escale.com>
> 
> dst_gc_work is cancelled and again rescheduled in __ds_free(). In case
> __dsf_free() is consistently called dst_gc_work will never get called resulting in
> memory not getting freed at all until one stops calling __dst_free
> Signed-off-by: Rajan Gupta <b15745@...escale.com>
> ---
>  net/core/dst.c |    1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/net/core/dst.c b/net/core/dst.c
> index 8246d47..6820206 100644
> --- a/net/core/dst.c
> +++ b/net/core/dst.c
> @@ -215,7 +215,6 @@ void __dst_free(struct dst_entry *dst)
>  	if (dst_garbage.timer_inc > DST_GC_INC) {
>  		dst_garbage.timer_inc = DST_GC_INC;
>  		dst_garbage.timer_expires = DST_GC_MIN;
> -		cancel_delayed_work(&dst_gc_work);
>  		schedule_delayed_work(&dst_gc_work, dst_garbage.timer_expires);
>  	}
>  	spin_unlock_bh(&dst_garbage.lock);

Strange, I never met this....

Since "if (dst_garbage.timer_inc > DST_GC_INC)" will be false if
timer_inc is DST_GC_INC.



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