[Bug 235625] Repeated excessive logging about unsuccessful port reset during device enumeration

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235625

            Bug ID: 235625
           Summary: Repeated excessive logging about unsuccessful port
                    reset during device enumeration
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: maxsteciuk at gmail.com

Since FreeBSD 12 build around last summer it was noticed the syslog was flooded
with the following messages
>>>Jan 29 20:18:44 kernel: uhub_reattach_port: giving up port reset - device vanished

Although the log message is displayed the USB devices and hubs are functional:
successfully connected and working.


The following sysctl configuration  helps to get rid of excessive logging but
the downside that certain USB devices (e.g. Create SoundBlaster) are not even
getting recognized by USB hub controller.

>>>hw.usb.disable_enumeration=1


As a quick solution I decreased  log level for the message from 0 to 1 so that
at least to reduce log noise. 
Here is a small proposed patch for decreasing log level:
https://github.com/trueos/trueos/pull/283/files


As a more elaborate solution I was thinking about possibility to implement log
throttling for this warning so it logs a  suficient number of times to bring to
attention but not inifinitely.

Another question is  whether this is a symptom of a larger problem: is
something broken (e.g. sys/dev/usb/usb_hub.c , /sys/dev/usb_device.c)  or not
functioning as expected...


Thanks,
Max

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