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The NAPI data structure is embedded in the netvsc_device structure and is freed when device is closed. There is still a reference (in NAPI list) to this which causes a crash in netif_napi_del when device is removed. Fix by managing NAPI instances correctly. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>