K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2012-09-27T13:37:30.996699Z
K 7
svn:log
V 502
MFC part of r238812 and remainder of r239149

From r238812, move mtx_init of per-ring locks into NIOCREGIF ioctl handler.
(Otherwise they're overwritten with zeros in netmap_if_new.)

From r239149:
  Improve lock and unlock symmetry

  - Move destruction of per-ring locks to netmap_dtor_locked to mirror the
  initialization that happens in NIOCREGIF.  Otherwise unloading a netmap-
  capable interface that was never put into netmap mode would try to
  mtx_destroy an uninitialized mutex, and panic.

END