[Bug 237666] repeated messages of "uhub_reattach_port: giving up port reset - device vanished"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237666

--- Comment #26 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
Aug  9 07:47:30 pughole kernel: xhci_roothub_exec: port status=0x000802a0
Aug  9 07:47:30 pughole kernel: uhub_read_port_status: port 21,
wPortStatus=0x07a0, wPortChange=0x0020, err=USB_ERR_NORMAL_COMPLETION
Aug  9 07:47:31 pughole kernel: xhci_roothub_exec: type=0xa3 request=0x00
wLen=0x0004 wValue=0x0000 wIndex=0x0003
Aug  9 07:47:31 pughole kernel: xhci_roothub_exec: UR_GET_STATUS i=3
Aug  9 07:47:31 pughole kernel: xhci_roothub_exec: port status=0xffffffff
Aug  9 07:47:31 pughole kernel: uhub_read_port_status: port 3,
wPortStatus=0x07fb, wPortChange=0x00fb, err=USB_ERR_NORMAL_COMPLETION
Aug  9 07:47:31 pughole kernel: uhub_reattach_port: giving up port reset -
device vanished
Aug  9 07:47:31 pughole kernel: xhci_roothub_exec: type=0x23 request=0x01
wLen=0x0000 wValue=0x0001 wIndex=0x0003
Aug  9 07:47:31 pughole kernel: xhci_roothub_exec: UR_CLEAR_PORT_FEATURE


Here it is "port status=0xffffffff" which is a totally off-track XHCI PCI read
value.

I'll try to make a patch you can try. This looks like a low-level hardware PCI
issue.

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