target/linux/generic/backport-5.10/610-v5.13-39-net-ethernet-mtk_eth_soc-fix-build_skb-cleanup.patch

   1 From 787082ab9f7be4711e52f67c388535eda74a1269 Mon Sep 17 00:00:00 2001
   2 From: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
   3 Date: Thu, 22 Apr 2021 22:20:56 -0700
   4 Subject: [PATCH] net: ethernet: mtk_eth_soc: fix build_skb cleanup
   5
   6 In case build_skb fails, call skb_free_frag on the correct pointer. Also
   7 update the DMA structures with the new mapping before exiting, because
   8 the mapping was successful
   9
  10 Suggested-by: Felix Fietkau <nbd@nbd.name>
  11 Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
  12 Signed-off-by: David S. Miller <davem@davemloft.net>
  13 ---
  14  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 +++--
  15  1 file changed, 3 insertions(+), 2 deletions(-)
  16
  17 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  18 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  19 @@ -1304,9 +1304,9 @@ static int mtk_poll_rx(struct napi_struc
  20                 /* receive data */
  21                 skb = build_skb(data, ring->frag_size);
  22                 if (unlikely(!skb)) {
  23 -                       skb_free_frag(new_data);
  24 +                       skb_free_frag(data);
  25                         netdev->stats.rx_dropped++;
  26 -                       goto release_desc;
  27 +                       goto skip_rx;
  28                 }
  29                 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
  30
  31 @@ -1326,6 +1326,7 @@ static int mtk_poll_rx(struct napi_struc
  32                 skb_record_rx_queue(skb, 0);
  33                 napi_gro_receive(napi, skb);
  34
  35 +skip_rx:
  36                 ring->data[idx] = new_data;
  37                 rxd->rxd1 = (unsigned int)dma_addr;
  38