[Bug 210695] USB on RPi Zero doesn't notice device disappearance

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210695

            Bug ID: 210695
           Summary: USB on RPi Zero doesn't notice device disappearance
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: trasz at FreeBSD.org

FreeBSD 11.0-CURRENT, when running on Raspberry Pi Zero ("bcm283x_dwcotg0: <DWC
OTG 2.0 integrated USB controller (bcm283x)> mem 0x980000-0x99ffff irq 10029 on
simplebus0"), doesn't seem to "notice" the device got unplugged.  In other
words, after disconnecting the USB memory stick from the USB cable, "usbconfig"
claims the device is still there:

root at rpi-b:~ # usbconfig 
ugen0.1: <OTG Root HUB DWCOTG> at usbus0, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (0mA)
ugen0.2: <DataTraveler 3.0 Kingston> at usbus0, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=ON (300mA)

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