netdev - Re: [GIT]: Networking

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Date:	Mon, 21 Jul 2008 09:53:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	adobriyan@...il.com, akpm@...ux-foundation.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	jeffrey.t.kirsher@...el.com
Subject: Re: [GIT]: Networking

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Mon, 21 Jul 2008 09:49:49 -0700 (PDT)

> Why is it so unnecessarily fragile to begin with? Especially for stuff 
> that happens at bootup or suspend, doing a BUG_ON() is _particularly_ 
> painful, because a dead machine means that you cannot get any logs or 
> anything else.

I agree, the BUG_ON() was the wrong way to go.

> So wouldn't it be *much* better to do something like the appended, and at 
> least try to limp on, and maybe have a system that people can get logs 
> out of?

Agreed, I'll apply this.  Thanks.

> diff --git a/net/core/dev.c b/net/core/dev.c
> index 2eed17b..43ab4f5 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -1325,7 +1325,8 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
>  
>  void __netif_schedule(struct Qdisc *q)
>  {
> -	BUG_ON(q == &noop_qdisc);
> +	if (WARN_ON_ONCE(q == &noop_qdisc))
> +		return;
>  
>  	if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) {
>  		struct softnet_data *sd;
> ---
--
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