net/arp: account for ARP delay, avoid duplicate packets on timeout
eth_rx() in the main reception loop may trigger sending a packet which is already timed out (or will immediately) upon reception of an ARP reply. As long as the ARP reply is pending, the timeout handler of a packet should be postponed. Happens on TFTP with bad network (e.g. WLAN). Signed-off-by: NStefan Brüns <stefan.bruens@rwth-aachen.de> Acked-by: NJoe Hershberger <joe.hershberger@ni.com>
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