[Bug 221317] ifconfig down/up issue after ixgbe driver update in r320897

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221317

--- Comment #43 from commit-hook at freebsd.org ---
A commit references this bug:

Author: marius
Date: Wed Feb 13 15:19:32 UTC 2019
New revision: 344100
URL: https://svnweb.freebsd.org/changeset/base/344100

Log:
  MFC: r343621

  ix(4): Run {mod,msf,mbx,fdir,phy}_task in if_update_admin_status

  From Piotr:

  This patch introduces adapter->task_requests register responsible for
  recording requests for mod_task, msf_task, mbx_task, fdir_task and
  phy_task calls. Instead of enqueueing these tasks with
  GROUPTASK_ENQUEUE, handlers will be called directly from
  ixgbe_if_update_admin_status() while holding ctx lock.

  SIOCGIFXMEDIA ioctl() call reads adapter->media list. The list is
  deleted and rewritten in ixgbe_handle_msf() task without holding ctx
  lock. This change is needed to maintain data coherency when sharing
  adapter info via ioctl() calls.

  Patch co-authored by Krzysztof Galazka <krzysztof.galazka at intel.com>.

  PR:           221317
  Submitted by: Piotr Pietruszewski <piotr.pietruszewski at intel.com>
  Reviewed by:  sbruno@, IntelNetworking
  Differential Revision:        https://reviews.freebsd.org/D18468

Changes:
_U  stable/12/
  stable/12/sys/dev/ixgbe/if_ix.c
  stable/12/sys/dev/ixgbe/ixgbe.h
  stable/12/sys/dev/ixgbe/ixgbe_type.h

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