netdev - Re: [PATCH net-next 06/13] ipv6: Create cleanup helper for fib6

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Date:   Wed, 27 Mar 2019 08:38:53 +0000
From:   Ido Schimmel <idosch@...lanox.com>
To:     David Ahern <dsahern@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH net-next 06/13] ipv6: Create cleanup helper for fib6_nh

On Tue, Mar 26, 2019 at 08:29:35PM -0700, David Ahern wrote:
> diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
> index 6613d8dbb0e5..db886085369b 100644
> --- a/net/ipv6/ip6_fib.c
> +++ b/net/ipv6/ip6_fib.c
> @@ -199,10 +199,7 @@ void fib6_info_destroy_rcu(struct rcu_head *head)
>  		free_percpu(f6i->rt6i_pcpu);
>  	}
>  
> -	lwtstate_put(f6i->fib6_nh.nh_lwtstate);
> -
> -	if (f6i->fib6_nh.nh_dev)
> -		dev_put(f6i->fib6_nh.nh_dev);
> +	fib6_nh_release(&f6i->fib6_nh);
>  
>  	ip_fib_metrics_put(f6i->fib6_metrics);
>  
> diff --git a/net/ipv6/route.c b/net/ipv6/route.c
> index 269ad7b9cdbb..4923a5f88e9b 100644
> --- a/net/ipv6/route.c
> +++ b/net/ipv6/route.c
> @@ -3012,6 +3012,14 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
>  	return err;
>  }
>  
> +void fib6_nh_release(struct fib6_nh *fib6_nh)
> +{
> +	if (fib6_nh->nh_dev)
> +		dev_put(fib6_nh->nh_dev);
> +
> +	lwtstate_put(fib6_nh->nh_lwtstate);

Why did you flip the order?

lwtstate_put()
dev_put()

is symmetric with fib6_nh_init()

> +}