Subject: Re: [PATCH] [net-next] bridge: move maybe_deliver_addr() inside #ifdef

From: Stephen Hemminger <[email-masked]>
Date: Wed, 25 Jan 2017 16:40:48 -0800

On Wed, 25 Jan 2017 23:29:33 +0100
Arnd Bergmann <[email-masked]> wrote:

> The only caller of this new function is inside of an #ifdef checking
> for CONFIG_BRIDGE_IGMP_SNOOPING, so we should move the implementation
> there too, in order to avoid this harmless warning:
> 
> net/bridge/br_forward.c:177:13: error: 'maybe_deliver_addr' defined but not used [-Werror=unused-function]
> 
> Fixes: 6db6f0eae605 ("bridge: multicast to unicast")
> Signed-off-by: Arnd Bergmann <[email-masked]>
> ---
>  net/bridge/br_forward.c | 50 ++++++++++++++++++++++++-------------------------
>  1 file changed, 25 insertions(+), 25 deletions(-)
> 
> diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
> index a0f9d0037d24..5a1f8ef49899 100644
> --- a/net/bridge/br_forward.c
> +++ b/net/bridge/br_forward.c
> @@ -174,31 +174,6 @@ static struct net_bridge_port *maybe_deliver(
>  	return p;
>  }
>  
> -static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
> -			       const unsigned char *addr, bool local_orig)
> -{
> -	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
> -	const unsigned char *src = eth_hdr(skb)->h_source;
> -
> -	if (!should_deliver(p, skb))
> -		return;
> -
> -	/* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
> -	if (skb->dev == p->dev && ether_addr_equal(src, addr))
> -		return;
> -
> -	skb = skb_copy(skb, GFP_ATOMIC);
> -	if (!skb) {
> -		dev->stats.tx_dropped++;
> -		return;
> -	}
> -
> -	if (!is_broadcast_ether_addr(addr))
> -		memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
> -
> -	__br_forward(p, skb, local_orig);
> -}
> -
>  /* called under rcu_read_lock */
>  void br_flood(struct net_bridge *br, struct sk_buff *skb,
>  	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig)
> @@ -245,6 +220,31 @@ void br_flood(struct net_bridge *br, struct sk_buff *skb,
>  }
>  
>  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
> +static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
> +			       const unsigned char *addr, bool local_orig)
> +{
> +	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
> +	const unsigned char *src = eth_hdr(skb)->h_source;
> +
> +	if (!should_deliver(p, skb))
> +		return;
> +
> +	/* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
> +	if (skb->dev == p->dev && ether_addr_equal(src, addr))
> +		return;
> +
> +	skb = skb_copy(skb, GFP_ATOMIC);
> +	if (!skb) {
> +		dev->stats.tx_dropped++;
> +		return;
> +	}
> +
> +	if (!is_broadcast_ether_addr(addr))
> +		memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
> +
> +	__br_forward(p, skb, local_orig);
> +}
> +
>  /* called with rcu_read_lock */
>  void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
>  			struct sk_buff *skb,

Acked-by: Stephen Hemminger <[email-masked]>