Public bug reported:

This is a deadlock fix for functionality introduced with which
applies to lts-xenial and linux-azure

With new transparent VF support, it is possible to get a deadlock
when some of the deferred work is running and the unregister_vf
is trying to cancel the work element. The solution is to use
trylock and reschedule (similar to bonding and team device)

** Affects: linux-azure (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Changed in: linux-azure (Ubuntu)
       Status: New => Confirmed

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  [Hyper-V] netvsc: fix rtnl deadlock on unregister of vf

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