PCI PM: Introduce device flag wakeup_prepared
Introduce a new PCI device flag, wakeup_prepared, to prevent PCI wake-up preparation code from being executed twice in a row for the same device and for the same purpose. Reviewed-by: NMatthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl> Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
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