MFC 1.91:   On the 82571 and newer chipset the ICR register is meaningful only   if the E1000_ICR_INT_ASSERTED bit is set.
MFC 1.91:
  On the 82571 and newer chipset the ICR register is meaningful only
  if the E1000_ICR_INT_ASSERTED bit is set.

  Submitted by:   Jack Vogel

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