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This improves AEN handler for Host Network Controller Driver Status Change (HNCDSC): * The channel's lock should be hold when accessing its state. * Do failover when host driver isn't ready. * Configure channel when host driver becomes ready. Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>