John Baldwin 04dd49d0a2 Add locking to the bt(4) driver and mark it MPSAFE.
- Use device_printf() and device_get_unit() instead of storing the unit
  number in the softc.
- Remove use of explicit bus space handles and tags.
- Return an errno value from bt_eisa_attach() if an error occurs rather
  than -1.
- Use BUS_PROBE_DEFAULT rather than 0.

Tested by:	no one
2012-10-15 16:13:55 +00:00
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