[Bug 237463] aacraid(4) doesn't work on powerpc64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237463

--- Comment #14 from commit-hook at freebsd.org ---
A commit references this bug:

Author: luporl
Date: Wed Mar  4 12:21:38 UTC 2020
New revision: 358613
URL: https://svnweb.freebsd.org/changeset/base/358613

Log:
  [aacraid] Add missing unmap call for SYNC mode

  This issue was observed on a PowerPC64 machine with an Adaptec RAID
Controller
  with PCI device ID 0x028d. After several read/write operations, the kernel
was
  panic'ing in bus_dmamap_sync(). This was due to a missing aac_unmap_command()
  in the SYNC path.

  PR:   237463
  Reviewed by:  jhibbits
  Differential Revision:        https://reviews.freebsd.org/D23668

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

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