macvtap: do not add self to waitqueue if doing a nonblock read
There's no need to add self to waitqueue if doing a nonblock read. This could help to avoid the spinlock contention. Acked-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NJason Wang <jasowang@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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