MFC r181992:   Because bfe(4) knows interrupt mask value there is no need to read   interrupt mask register again. This saves one register access per   each interrupt.   Also don't try to process frames when driver is not running.
MFC r181992:
  Because bfe(4) knows interrupt mask value there is no need to read
  interrupt mask register again. This saves one register access per
  each interrupt.
  Also don't try to process frames when driver is not running.

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