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dev_queue_xmit() will return a positive value if the packet could not be queued, often because the real network device (in our case the mac802154 wpan device) has its queue stopped. lowpan_xmit() should handle the positive return code (for the debug statement) and return that value to the higher layer so the higher layer will retry sending the packet. Signed-off-by: Alan Ott <alan@signal11.us> Signed-off-by: David S. Miller <davem@davemloft.net>