Subject: Re: [PATCH net-next 2/8] net: dsa: directly fetch switch in lan9303_rcv

From: Florian Fainelli <[email-masked]>
Date: Fri, 29 Sep 2017 12:02:01 -0700

On 09/29/2017 11:36 AM, Vivien Didelot wrote:
> In a single-chip switch fabric, there is no need to fetch the dsa_switch
> structure from the tree, directly use the CPU port's "ds" member.
> 
> Signed-off-by: Vivien Didelot <[email-masked]>
> ---
>  net/dsa/tag_lan9303.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
> index 0b9826105e42..f0b51acf36ac 100644
> --- a/net/dsa/tag_lan9303.c
> +++ b/net/dsa/tag_lan9303.c
> @@ -72,11 +72,10 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
>  {
>  	u16 *lan9303_tag;
>  	struct dsa_switch_tree *dst = dev->dsa_ptr;
> -	struct dsa_switch *ds;
> +	struct dsa_port *cpu_dp = dst->cpu_dp;
> +	struct dsa_switch *ds = cpu_dp->ds;
>  	unsigned int source_port;
>  
> -	ds = dst->ds[0];
> -
>  	if (unlikely(!ds)) {
>  		dev_warn_ratelimited(&dev->dev, "Dropping packet, due to missing DSA switch device\n");
>  		return NULL;

Similarly to the patch before, you can probably drop this test, I don't
actually see how we could trigger it.
-- 
Florian