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Pawel Biernacki authored
hw.bus.info was added in r68522 as a node, but there was never anything connected "behind" it. Its only purpose is to return a struct u_businfo. The only in-base consumer are devinfo(3)/devinfo(8). Rewrite the handler as SYSCTL_PROC and mark it as MPSAFE and read-only as there never was a writable path. Reviewed by: kib Approved by: kib (mentor) Sponsored by: Mysterious Code Ltd. Differential Revision: https://reviews.freebsd.org/D25321
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