From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
From: Biao Huang <biao.huang@xxxxxxxxxxxx>
commit 95b39f07a17faef3a9b225248ba449b976e529c8 upstream.
mtk_star_dma_unmap_rx() should unmap the dma_addr of old skb rather than
that of new skb.
Assign new_dma_addr to desc_data.dma_addr after all handling of old skb
ends to avoid unexpected receive side error.
Fixes: f96e9641e92b ("net: ethernet: mtk-star-emac: fix error path in RX handling")
Signed-off-by: Biao Huang <biao.huang@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mediatek/mtk_star_emac.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/mediatek/mtk_star_emac.c
+++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c
@@ -1225,8 +1225,6 @@ static int mtk_star_receive_packet(struc
goto push_new_skb;
}
- desc_data.dma_addr = new_dma_addr;
-
/* We can't fail anymore at this point: it's safe to unmap the skb. */
mtk_star_dma_unmap_rx(priv, &desc_data);
@@ -1236,6 +1234,9 @@ static int mtk_star_receive_packet(struc
desc_data.skb->dev = ndev;
netif_receive_skb(desc_data.skb);
+ /* update dma_addr for new skb */
+ desc_data.dma_addr = new_dma_addr;
+
push_new_skb:
desc_data.len = skb_tailroom(new_skb);
desc_data.skb = new_skb;
