netvsc: uses RCU instead of removal flag
It is cleaner to use RCU protected pointer (nvdev_ctx->nvdev) to indicate device is in removed state, rather than having a separate boolean flag. By using the pointer the context can be checked by static checkers and dynamic lockdep. Signed-off-by: NStephen Hemminger <sthemmin@microsoft.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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