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From:   Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
To:     Felix Fietkau <nbd@nbd.name>, John Crispin <john@phrozen.org>,
        Sean Wang <sean.wang@mediatek.com>,
        Mark Lee <Mark-MC.Lee@mediatek.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org
Cc:     Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Subject: [PATCH net-next 03/14] net: ethernet: mtk_eth_soc: fix build_skb cleanup
Date:   Wed, 21 Apr 2021 21:09:03 -0700
Message-Id: <20210422040914.47788-4-ilya.lipnitskiy@gmail.com>
In-Reply-To: <20210422040914.47788-1-ilya.lipnitskiy@gmail.com>
References: <20210422040914.47788-1-ilya.lipnitskiy@gmail.com>
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In case build_skb fails, call skb_free_frag on the correct pointer. Also
update the DMA structures with the new mapping before exiting, because
the mapping was successful

Suggested-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 540003f3fcb8..07daa5de8bec 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1304,9 +1304,9 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		/* receive data */
 		skb = build_skb(data, ring->frag_size);
 		if (unlikely(!skb)) {
-			skb_free_frag(new_data);
+			skb_free_frag(data);
 			netdev->stats.rx_dropped++;
-			goto release_desc;
+			goto skip_rx;
 		}
 		skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
 
@@ -1326,6 +1326,7 @@ static int mtk_poll_rx(struct napi_struct *napi, int budget,
 		skb_record_rx_queue(skb, 0);
 		napi_gro_receive(napi, skb);
 
+skip_rx:
 		ring->data[idx] = new_data;
 		rxd->rxd1 = (unsigned int)dma_addr;
 
-- 
2.31.1