Merge branch 'hv_netvsc-fix-races-during-shutdown-and-changes'

Stephen Hemminger says:

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hv_netvsc: fix races during shutdown and changes

This set of patches fixes issues identified by Vitaly Kuznetsov and
Mohammed Gamal related to state changes in Hyper-v network driver.

A lot of the issues are because setting up the netvsc device requires
a second step (in work queue) to get all the sub-channels running.
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Signed-off-by: David S. Miller <davem@davemloft.net>