Auke Kok 77b2aad5b4 e1000: implement more efficient tx queue locking
Implement more efficient locking (avoid the lock) when checking for
a stopped queue.  Also don't wake the queue unless the threshold is
reached to avoid queue on/off thrash.


Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
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