[Bug 276354] ubt0 triggering 1000 xhci0 interrupts per second

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276354

            Bug ID: 276354
           Summary: ubt0 triggering 1000 xhci0 interrupts per second
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: trasz@FreeBSD.org

My ubt0 isn't working, but despite this it makes xhci0 generate 1000 interrupts
per second (according to "vmstat -i"), until I do "service bluetooth start
ubt0".  That errors out, but makes the interrupts go away.  It needs to be done
again after a suspend/resume cycle.

Relevant bits of dmesg:

xhci0: <Intel Sunrise Point-LP USB 3.0 controller> mem 0xef230000-0xef23ffff
irq 16 at device 20.0 on pci0
xhci0: 32 bytes context size, 64-bit DMA
usbus0: waiting for BIOS to give up control
xhci_interrupt: host controller halted
usbus0 on xhci0
usbus0: 5.0Gbps Super Speed USB v3.0

ubt0: <vendor 0x8087 product 0x0a2b, class 224/1, rev 2.00/0.10, addr 1> on
usbus0

When "service bluetooth start ubt0" fails, dmesg says:

ng_hci_process_command_timeout: ubt0hci - unable to complete HCI command
OGF=0x3, OCF=0x3. Timeout

But this isn't really the problem I'm reporting here.

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