a1df0d9592
- 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