[Bug 211852] Unsafe shutdowns on Intel 750 SSD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211852

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: nwhitehorn
Date: Sat Aug 12 22:13:06 UTC 2017
New revision: 322443
URL: https://svnweb.freebsd.org/changeset/base/322443

Log:
  Move NVME controller shutdown from being called as part of module unloading
  to being called through the newbus DEVICE_SHUTDOWN() path. This ensures that
  the NVME controller gets shut down before the device and bus disappear
  and prevents data corruption on shutdown on at least Samsung EVO 960 SSDs.

  PR:           kern/211852
  Reviewed by:  imp
  MFC after:    2 weeks

Changes:
  head/sys/dev/nvme/nvme.c

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