[Bug 225794] VM images for 12.0-CURRENT have problem with USB 3.0 ports

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225794

--- Comment #47 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avg
Date: Mon Dec 17 16:01:38 UTC 2018
New revision: 342169
URL: https://svnweb.freebsd.org/changeset/base/342169

Log:
  add a knob that disables detection of write protected disks

  It has been reported that on some systems (with real hardware passed
  through to a virtual machine) the WP detection causes USB disk probing
  failures.

  While here, also fix the selection of the next state in the case
  of malloc failure in DA_STATE_PROBE_WP.  It was DA_STATE_PROBE_RC
  unconditionally even when it should have been DA_STATE_PROBE_RC16.

  PR:           225794
  Reported by:  David Boyd <David.Boyd49 at twc.com>
  MFC after:    3 weeks
  Differential Revision: https://reviews.freebsd.org/D18496

Changes:
  head/sys/cam/scsi/scsi_da.c

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