When received a packet with an invalid length recorded in rx descriptor, we should free this rx descriptor to allow us to continue to receive following packets. Without doing so, u-boot will stuck in a dead loop trying to process this invalid rx descriptor.
This patch adds a call to mt7628_eth_free_pkt() after received an invalid packet length.
Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- drivers/net/mt7628-eth.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/mt7628-eth.c b/drivers/net/mt7628-eth.c index eef25da8a8..8ca2c66edb 100644 --- a/drivers/net/mt7628-eth.c +++ b/drivers/net/mt7628-eth.c @@ -139,6 +139,8 @@ struct mt7628_eth_dev { struct reset_ctl rst_ephy; };
+static int mt7628_eth_free_pkt(struct udevice *dev, uchar *packet, int length); + static int mdio_wait_read(struct mt7628_eth_dev *priv, u32 mask, bool mask_set) { void __iomem *base = priv->eth_sw_base; @@ -400,6 +402,7 @@ static int mt7628_eth_recv(struct udevice *dev, int flags, uchar **packetp) length = FIELD_GET(RX_DMA_PLEN0, priv->rx_ring[idx].rxd2); if (length == 0 || length > MTK_QDMA_PAGE_SIZE) { printf("%s: invalid length (%d bytes)\n", __func__, length); + mt7628_eth_free_pkt(dev, NULL, 0); return -EIO; }