[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 #137 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: hselasky
Date: Sat Sep 19 22:37:46 UTC 2020
New revision: 365918
URL: https://svnweb.freebsd.org/changeset/base/365918

Log:
  Fix for use of the XHCI driver on Cortex-A72 by adding a missing cache
  flush operation before writing to the XHCI_ERSTBA_LO/HI register(s).

  PR:           237666
  Discussed with:       Mark Millard <marklmi at yahoo.com>
  MFC after:    1 week
  Sponsored by: Mellanox Technologies // Nvidia

Changes:
  head/sys/dev/usb/controller/xhci.c

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