jhb 1cfcf4363c Add locking to the dpt(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.
- Remove the global dpt_softcs list and use devclass_get_device() instead.
- Use pci_enable_busmaster() rather than frobbing the PCI command register
  directly.

Tested by:	no one
2012-10-15 16:29:08 +00:00
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