block: access wakeup with atomic ops
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Message-Id: <20170605123908.18777-6-pbonzini@redhat.com> Signed-off-by: NFam Zheng <famz@redhat.com>
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