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when all descriptors in a queue are free. When all descriptors are free after wm_txeof(), it's caused by lost interrupt (though I've never seen it). One possibility is chip bug and another possibility is software bug. We should reset in any cases. If we don't reset and don't print error message, TX processing is done intermittently and user might not noticed the problem. - Rename txq_watchdog to txq_sending to make the meaning clear.
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