net: ethernet: mtk_eth_soc: fix build_skb cleanup

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 540003f..07daa5d 100644 (file)
--- 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;