Landon J. Fuller a1df0d9592 Fix minor locking issues in the Power Mac Uninorth PCI bridge driver.
- Call resource_int_value() once during attach, rather than within the
  pci_(read|write)_config() code path; this avoids taking a blocking mutex
  to read kenv variables.

- Use a spin lock to protect non-atomic config space accesses; this matches
  the behavior of Darwin's AppleMacRiscPCI driver.

Reviewed by:	jhibbits
Differential Revision:	https://reviews.freebsd.org/D13839
2018-01-10 22:19:11 +00:00
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