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1ebf7b5196
The ethernetif use semaphore netif->tx_ack to protect the local variable `struct eth_tx_msg msg` in function `ethernetif_linkoutput`. But the function could be called in multiple context: LwIP "tcpip" thread, "erx" thread(on linkup) and any user thread that call `udp_sendto`. So the global semaphore protection is not sufficient. It could only wakeup the top priority waiting thread instead of the thread that owns the `msg` and may result the `msg` next in the mailbox got destructed. So to use a `rt_completion` within the `struct eth_tx_msg` and synchronize on that. This could deal the ownership issue in an easy way.