From: Théo Lebrun <theo.lebrun@bootlin.com>
Date: Tue, 14 Oct 2025 15:25:14 +0000 (+0200)
Subject: net: macb: drop `count` local variable in macb_tx_map()
X-Git-Tag: v6.19-rc1~170^2~364^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5fe4f3e5912d79832bc37b207234aaf84c1b789;p=thirdparty%2Flinux.git

net: macb: drop `count` local variable in macb_tx_map()

Local variable `count` is useless: it counts number of DMA descriptors
used and returns it. But the return value is only checked for error.
Drop counting the number of DMA descriptors and return a usual
negative-if-error integer.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
Link: https://patch.msgid.link/20251014-macb-cleanup-v1-13-31cd266e22cd@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 08e541d8f8e68..dd3b13fa30471 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -1992,7 +1992,7 @@ static unsigned int macb_tx_map(struct macb *bp,
 	unsigned int len, i, tx_head = queue->tx_head;
 	struct macb_tx_skb *tx_skb = NULL;
 	struct macb_dma_desc *desc;
-	unsigned int offset, size, count = 0;
+	unsigned int offset, size;
 	unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
 	unsigned int eof = 1, mss_mfs = 0;
 	u32 ctrl, lso_ctrl = 0, seq_ctrl = 0;
@@ -2031,7 +2031,6 @@ static unsigned int macb_tx_map(struct macb *bp,
 
 		len -= size;
 		offset += size;
-		count++;
 		tx_head++;
 
 		size = umin(len, bp->max_tx_length);
@@ -2060,7 +2059,6 @@ static unsigned int macb_tx_map(struct macb *bp,
 
 			len -= size;
 			offset += size;
-			count++;
 			tx_head++;
 		}
 	}
@@ -2139,7 +2137,7 @@ static unsigned int macb_tx_map(struct macb *bp,
 
 	queue->tx_head = tx_head;
 
-	return count;
+	return 0;
 
 dma_error:
 	netdev_err(bp->dev, "TX DMA map failed\n");
@@ -2150,7 +2148,7 @@ dma_error:
 		macb_tx_unmap(bp, tx_skb, 0);
 	}
 
-	return 0;
+	return -ENOMEM;
 }
 
 static netdev_features_t macb_features_check(struct sk_buff *skb,
@@ -2336,7 +2334,7 @@ static netdev_tx_t macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	/* Map socket buffer for DMA transfer */
-	if (!macb_tx_map(bp, queue, skb, hdrlen)) {
+	if (macb_tx_map(bp, queue, skb, hdrlen)) {
 		dev_kfree_skb_any(skb);
 		goto unlock;
 	}