• Rafael J. Wysocki's avatar
    ACPI PM: Replace wakeup.prepared with reference counter · 9b83ccd2
    Rafael J. Wysocki authored
    The wakeup.prepared flag is used for marking devices that have the
    wake-up power already enabled, so that the wake-up power is not
    enabled twice in a row for the same device.  This assumes, however,
    that device wake-up power will only be enabled once, while the device
    is being prepared for a system-wide sleep transition, and the second
    attempt is made by acpi_enable_wakeup_device_prep().
    
    With the upcoming PCI wake-up rework this assumption will not hold
    any more for PCI bridges and the root bridge whose wake-up power
    may be enabled as a result of wake-up enable propagation from other
    devices (eg. add-on devices that are not associated with any GPEs).
    Thus, there may be many attempts to enable wake-up power on a PCI
    bridge or the root bridge during a system power state transition
    and it's better to replace wakeup.prepared with a reference counter.
    Reviewed-by: default avatarMatthew Garrett <mjg59@srcf.ucam.org>
    Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
    Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
    9b83ccd2
acpi_bus.h 11.3 KB