John Baldwin c8b27aca43 Fixup locking and mark MPSAFE:
- Add locked versions of start and init.  The SRM_MEDIA code in dc_init()
  stayed in dc_init() instead of moving to dc_init_locked() to make the
  locking saner.
- Use callout_init_mtx().
- Fixup locking in detach and ioctl.
- Lock the driver in the ifmedia callouts.
- Don't recurse on the driver lock.
- De-spl.

MFC after:	3 days
2005-08-18 19:10:07 +00:00
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