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net: mt7628-eth: free rx descriptor on receiving failure

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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.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
This commit is contained in:
Weijie Gao 2019-09-25 17:45:34 +08:00 committed by Daniel Schwierzeck
parent f079321009
commit c88ee3ea0a
1 changed files with 3 additions and 0 deletions
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3
drivers/net/mt7628-eth.c
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@ -142,6 +142,8 @@ struct mt7628_eth_dev {
struct phy_device *phy;
};
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;
@ -403,6 +405,7 @@ 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;
}