K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2010-09-15T14:24:21.756774Z
K 7
svn:log
V 399
Fix bogus busying mechanism from cdevsw callbacks:
- D_TRACKCLOSE may be used there as d_close() are expected to match up
  d_open() calls
- Replace the hand-crafted counter and flag with the
  device_busy()/device_unbusy() proper usage.

Sponsored by:	Sandvine Incorporated
Reported by:	Mark Johnston <mjohnston at sandvine dot com>
Tested by:	Mark Johnston
Reviewed by:	emaste

MFC after:	10 days

END