[Bug 188899] [cas] cas ethernet driver seems to have issues with some multiport card and mother board combinations

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188899

--- Comment #12 from commit-hook at freebsd.org ---
A commit references this bug:

Author: marius
Date: Fri Nov 20 02:23:36 UTC 2015
New revision: 291088
URL: https://svnweb.freebsd.org/changeset/base/291088

Log:
  Avoid a NULL pointer dereference in bounce_bus_dmamap_sync() when the
  map has been created via bounce_bus_dmamem_alloc(). Even for coherent
  DMA - which bus_dmamem_alloc(9) typically is used for -, calling of
  bus_dmamap_sync(9) isn't optional.

  PR:        188899 (non-original problem)
  MFC after:    3 days

Changes:
  head/sys/arm64/arm64/busdma_bounce.c
  head/sys/x86/x86/busdma_bounce.c

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