[Bug 250309] devmatch: panic: general protection fault: sysctl_devices() -> sysctl_root_handler_locked() in hw.bus.devices sysctl handler when plugging in USB mouse

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250309

--- Comment #6 from Warner Losh <imp@FreeBSD.org> ---
I think we can just switch the bus lock routines over to using an sx lock w/o
adding or removing other locking which may be tricky for some of the consumers
of newbus (they already cope with Giant though, so a giant-like sx lock I think
will be fine).

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