netvsc: fix rtnl deadlock on unregister of vf
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). Reported-by:Vitaly Kuznetsov <vkuznets@redhat.com> Fixes: 0c195567 ("netvsc: transparent VF management") Signed-off-by:
Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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