netdev - [PATCH net] net: airoha: fix error branch in airoha_dev_xmit and airoha_set_gdm

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Message-ID: <b628871bc8ae4861b5e2ab4db90aaf373cbb7cee.1721203880.git.lorenzo@kernel.org>
Date: Wed, 17 Jul 2024 10:15:46 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: nbd@....name,
	sean.wang@...iatek.com,
	Mark-MC.Lee@...iatek.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	angelogioacchino.delregno@...labora.com,
	lorenzo.bianconi83@...il.com
Subject: [PATCH net] net: airoha: fix error branch in airoha_dev_xmit and airoha_set_gdm_ports

Fix error case management in airoha_dev_xmit routine since we need to
DMA unmap pending buffers starting from q->head.
Moreover fix a typo in error case branch in airoha_set_gdm_ports
routine.

Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index 7967a92803c2..cc1a69522f61 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -977,7 +977,7 @@ static int airoha_set_gdm_ports(struct airoha_eth *eth, bool enable)
 	return 0;
 
 error:
-	for (i--; i >= 0; i++)
+	for (i--; i >= 0; i--)
 		airoha_set_gdm_port(eth, port_list[i], false);
 
 	return err;
@@ -2431,9 +2431,11 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
 	return NETDEV_TX_OK;
 
 error_unmap:
-	for (i--; i >= 0; i++)
-		dma_unmap_single(dev->dev.parent, q->entry[i].dma_addr,
-				 q->entry[i].dma_len, DMA_TO_DEVICE);
+	for (i--; i >= 0; i--) {
+		index = (q->head + i) % q->ndesc;
+		dma_unmap_single(dev->dev.parent, q->entry[index].dma_addr,
+				 q->entry[index].dma_len, DMA_TO_DEVICE);
+	}
 
 	spin_unlock_bh(&q->lock);
 error:
-- 
2.45.2