Public bug reported:

[Impact]
On an APM Merlin (X-Gene2) board, the onboard 1G interface fails to 
re-establish link when the interface is brought down and back up. Juju + MAAS 
provider does this after every install (so to configure a bridge), making this 
config unusable.

This was actually a regression introduced by the fix for LP: #1632739 in
4.4.0-48.69.

[Test Case]
1) From a remote system, start a ping to the IP address of the Merlin board's 
eth0 interface.
2) On the merlin board: sudo ifconfig eth0 down; sudo ifconfig eth0 up
3) Ping should recover, but doesn't

[Fix]
commit 84a527a41f38a80353f185d05e41b021e1ff672b
Author: Shaohui Xie <shaohui....@nxp.com>
Date:   Tue May 10 17:42:26 2016 +0800

    net: phylib: fix interrupts re-enablement in phy_start

[Regression Risk]

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: New

** Affects: linux (Ubuntu Xenial)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Cosmic)
     Importance: Undecided
     Assignee: dann frazier (dannf)
         Status: New

** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Cosmic)
   Importance: Undecided
     Assignee: dann frazier (dannf)
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1785739

Title:
  [Regression] APM Merlin boards fail to recover link after interface
  down/up

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