net: fec: fix improper use of NETDEV_TX_BUSY
The ndo_start_xmit() method must not free skb when returning NETDEV_TX_BUSY, since caller is going to requeue freed skb. Fix it by returning NETDEV_TX_OK in case of dma_map_single() fails. Fixes: 79f33912 ("net: fec: Add software TSO support") Signed-off-by: NZhang Changzhong <zhangchangzhong@huawei.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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