linux-kernel - Re: [PATCH v2] net: ethernet: ag71xx: Remove dead code

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Message-ID: <28de0e9b-bbe0-4b9d-bd22-8efe0f456ec1@linux.dev>
Date: Wed, 11 Sep 2024 16:47:54 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Chris Snook <chris.snook@...il.com>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Andrew Lunn <andrew@...n.ch>, Oleksij Rempel <o.rempel@...gutronix.de>
Cc: kernel@...labora.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: ethernet: ag71xx: Remove dead code

On 11/09/2024 14:58, Muhammad Usama Anjum wrote:
> The err variable isn't being used anywhere other than getting
> initialized to 0 and then it is being checked in if condition. The
> condition can never be true. Remove the err and deadcode.
> 
> Move the rx_dropped counter above when skb isn't found.
> 
> Fixes: d51b6ce441d3 ("net: ethernet: add ag71xx driver")
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
> Changes since v1:
> - Move the rx_dropped counter above when skb isn't found.
> ---
>   drivers/net/ethernet/atheros/ag71xx.c | 13 ++++---------
>   1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/ethernet/atheros/ag71xx.c b/drivers/net/ethernet/atheros/ag71xx.c
> index db2a8ade62055..2effceeb191db 100644
> --- a/drivers/net/ethernet/atheros/ag71xx.c
> +++ b/drivers/net/ethernet/atheros/ag71xx.c
> @@ -1619,7 +1619,6 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
>   		unsigned int i = ring->curr & ring_mask;
>   		struct ag71xx_desc *desc = ag71xx_ring_desc(ring, i);
>   		int pktlen;
> -		int err = 0;
>   
>   		if (ag71xx_desc_empty(desc))
>   			break;
> @@ -1643,20 +1642,16 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
>   		skb = napi_build_skb(ring->buf[i].rx.rx_buf, ag71xx_buffer_size(ag));
>   		if (!skb) {
>   			skb_free_frag(ring->buf[i].rx.rx_buf);
> +			ndev->stats.rx_dropped++;
>   			goto next;
>   		}
>   
>   		skb_reserve(skb, offset);
>   		skb_put(skb, pktlen);
>   
> -		if (err) {
> -			ndev->stats.rx_dropped++;
> -			kfree_skb(skb);
> -		} else {
> -			skb->dev = ndev;
> -			skb->ip_summed = CHECKSUM_NONE;
> -			list_add_tail(&skb->list, &rx_list);
> -		}
> +		skb->dev = ndev;
> +		skb->ip_summed = CHECKSUM_NONE;
> +		list_add_tail(&skb->list, &rx_list);
>   
>   next:
>   		ring->buf[i].rx.rx_buf = NULL;


Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>