netdev - Re: fib6_del_route has redundant code

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Message-Id: <20071227.211808.221171928.davem@davemloft.net>
Date:	Thu, 27 Dec 2007 21:18:08 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	guijianfeng@...fujitsu.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: fib6_del_route has redundant code

From: Gui Jianfeng <guijianfeng@...fujitsu.com>
Date: Thu, 27 Dec 2007 15:26:46 +0800

> I think the following code in fib6_del_route in the latest kernel is useless.
> 1125         if (fn->leaf == NULL && fn->fn_flags&RTN_TL_ROOT)
> 1126                 fn->leaf = &ip6_null_entry;
> 
> ip6_null_entry will never be unlinked from fn->leaf now, that is,
> fn->leaf == NULL will never meet.

I think you are right, but if it is true the next block of
code is dead too:

	/* If it was last route, expunge its radix tree node */
	if (fn->leaf == NULL) {
		fn->fn_flags &= ~RTN_RTINFO;
		rt6_stats.fib_route_nodes--;
		fn = fib6_repair_tree(fn);
	}

But I am not completely convinced that all of these lines
of code can be removed :-)
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