target/linux/generic/backport-5.10/610-v5.13-38-net-ethernet-mtk_eth_soc-unmap-RX-data-before-callin.patch

   1 From 5196c417854942e218a59ec87bf7d414b3bd581e Mon Sep 17 00:00:00 2001
   2 From: Felix Fietkau <nbd@nbd.name>
   3 Date: Thu, 22 Apr 2021 22:20:55 -0700
   4 Subject: [PATCH] net: ethernet: mtk_eth_soc: unmap RX data before calling
   5  build_skb
   6
   7 Since build_skb accesses the data area (for initializing shinfo), dma unmap
   8 needs to happen before that call
   9
  10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  11 [Ilya: split build_skb cleanup fix into a separate commit]
  12 Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
  13 Signed-off-by: David S. Miller <davem@davemloft.net>
  14 ---
  15  drivers/net/ethernet/mediatek/mtk_eth_soc.c | 5 +++--
  16  1 file changed, 3 insertions(+), 2 deletions(-)
  17
  18 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  19 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  20 @@ -1333,6 +1333,9 @@ static int mtk_poll_rx(struct napi_struc
  21                         goto release_desc;
  22                 }
  23
  24 +               dma_unmap_single(eth->dev, trxd.rxd1,
  25 +                                ring->buf_size, DMA_FROM_DEVICE);
  26 +
  27                 /* receive data */
  28                 skb = build_skb(data, ring->frag_size);
  29                 if (unlikely(!skb)) {
  30 @@ -1342,8 +1345,6 @@ static int mtk_poll_rx(struct napi_struc
  31                 }
  32                 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
  33
  34 -               dma_unmap_single(eth->dev, trxd.rxd1,
  35 -                                ring->buf_size, DMA_FROM_DEVICE);
  36                 pktlen = RX_DMA_GET_PLEN0(trxd.rxd2);
  37                 skb->dev = netdev;
  38                 skb_put(skb, pktlen);