[Bug 194606] filesystem unmount deadlock on 10.1 and head when TRIM enabled at unmount after r268815, MFC of 268205

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194606

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A commit references this bug:

Author: smh
Date: Sun Oct 26 18:41:01 UTC 2014
New revision: 273704
URL: https://svnweb.freebsd.org/changeset/base/273704

Log:
  Fix CF ERASE breakage caused by 268205.

  This prevents BIO_DELETE requests getting stuck in the TRIM queue which
  results in a panic on shutdown due to outstanding requests.

  PR:        194606
  Reported by:    Guido Falsi
  Reviewed by:    mav
  MFC after:    3 days
  Sponsored by:    Multiplay

Changes:
  head/sys/cam/ata/ata_da.c

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