netdev - Re: [RFC PATCH] ipv4: release dev refcnt early when destroying inetdev

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Date:	Tue, 14 Sep 2010 13:45:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	nicolas.dichtel@...nd.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] ipv4: release dev refcnt early when destroying
 inetdev

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 10 Sep 2010 17:16:14 +0200

> Le vendredi 10 septembre 2010 à 16:57 +0200, Nicolas Dichtel a écrit :
> 
>> Is this not true in IPv6? What is the difference?
> 
> It might be a bug on ipv6, who knows ?
> 
> Releasing a reference count, but not setting idev->dev to NULL is 
> a sign something is wrong...

If anything this is more of a BUG trap than a true correctness patch,
but either way if you want me to apply this please formally submit
this with a proper commit message and signoff, thanks!

> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 5bc893e..26e39bc 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -330,6 +330,7 @@ void in6_dev_finish_destroy(struct inet6_dev *idev)
>  	printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
>  #endif
>  	dev_put(dev);
> +	idev->dev = NULL;
>  	if (!idev->dead) {
>  		pr_warning("Freeing alive inet6 device %p\n", idev);
>  		return;
> 
> 
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