linux-kernel - [PATCH v2] net: ag71xx: remove dead code path

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Message-Id: <20240913014731.149739-1-qianqiang.liu@163.com>
Date: Fri, 13 Sep 2024 09:47:32 +0800
From: Qianqiang Liu <qianqiang.liu@....com>
To: kuba@...nel.org,
	edumazet@...gle.com
Cc: usama.anjum@...labora.com,
	andrew@...n.ch,
	o.rempel@...gutronix.de,
	rosenp@...il.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Qianqiang Liu <qianqiang.liu@....com>
Subject: [PATCH v2] net: ag71xx: remove dead code path

The "err" is always zero, so the following branch can never be executed:
if (err) {
	ndev->stats.rx_dropped++;
	kfree_skb(skb);
}
Therefore, the "if" statement can be removed.

Use "ndev->stats.rx_errors" to count "napi_build_skb()" failure

Signed-off-by: Qianqiang Liu <qianqiang.liu@....com>
---
Changes since v1:
 - Use "ndev->stats.rx_errors" to count "napi_build_skb()" failure
---
 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 96a6189cc31e..9586b6894f7e 100644
--- a/drivers/net/ethernet/atheros/ag71xx.c
+++ b/drivers/net/ethernet/atheros/ag71xx.c
@@ -1616,7 +1616,6 @@ 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;
@@ -1639,6 +1638,7 @@ 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) {
+			ndev->stats.rx_errors++;
 			skb_free_frag(ring->buf[i].rx.rx_buf);
 			goto next;
 		}
@@ -1646,14 +1646,9 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 		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;
-- 
2.34.1