netdev - RE: [RFC PATCH] ipv6: Split from and expires field in dst

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Date:	Wed, 20 Feb 2013 10:55:35 -0000
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Neil Horman" <nhorman@...driver.com>, <netdev@...r.kernel.org>
Cc:	<eric.dumazet@...il.com>, "David Miller" <davem@...emloft.net>,
	"Gao feng" <gaofeng@...fujitsu.com>, "Jiri Bohac" <jbohac@...e.cz>
Subject: RE: [RFC PATCH] ipv6: Split from and expires field in dst_entry out of union [net-next]

>  static inline void rt6_clean_expires(struct rt6_info *rt)
>  {
> -	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
> +	if (!rt->rt6i_flags & RTF_EXPIRES)
>  		dst_release(rt->dst.from);
> 
>  	rt->rt6i_flags &= ~RTF_EXPIRES;
>  	rt->dst.from = NULL;
> +	rt->dst.expires = 0;
>  }
> 
>  static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
>  {
> -	if (!(rt->rt6i_flags & RTF_EXPIRES) && rt->dst.from)
> +	if (!rt->rt6i_flags & RTF_EXPIRES)
>  		dst_release(rt->dst.from);
> 
>  	rt->rt6i_flags |= RTF_EXPIRES;
> +	rt->dst.from = NULL;
>  	rt->dst.expires = expires;
>  }
> 
>  static inline void rt6_update_expires(struct rt6_info *rt, int timeout)
>  {
>  	if (!(rt->rt6i_flags & RTF_EXPIRES)) {
> -		if (rt->dst.from)
> -			dst_release(rt->dst.from);
> +		dst_release(rt->dst.from);
>  		/* dst_set_expires relies on expires == 0
>  		 * if it has not been set previously.
>  		 */
>  		rt->dst.expires = 0;
> +		rt6->dst.from = NULL;
>  	}

Aren't there also problems with setting and clearing RTF_EXPIRES?
Since that flag looks as though it was the descriminant for the union
it probably isn't needed - provided dst.expires is never 0 when valid.

	David




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