netvsc: save pointer to parent netvsc_device in channel table
Keep back pointer in the per-channel data structure to avoid any possible RCU related issues when napi poll is called but netvsc_device is in RCU limbo. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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