dwc_eth_qos: fix race condition in dwceqos_start_xmit
The xmit handler and the tx_reclaim tasklet had a race on the tx_free variable which could lead to a tx timeout if tx_free was updated after the tx complete interrupt. Signed-off-by: NRabin Vincent <rabinv@axis.com> Signed-off-by: NLars Persson <larper@axis.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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