net: fec: fix rare tx timeout
During certain heavy network loads TX could time out with TX ring dump. TX is sometimes never restarted after reaching "tx_stop_threshold" because function "fec_enet_tx_queue" only tests the first queue. In addition the TX timeout callback function failed to recover because it also operated only on the first queue. Signed-off-by: Rickard x Andersson <rickaran@axis.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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