• Rafael J. Wysocki's avatar
    ACPICA: Clear status of GPEs on first direct enable · 44758baf
    Rafael J. Wysocki authored
    ACPI GPEs (other than the EC one) can be enabled in two situations.
    First, the GPEs with existing _Lxx and _Exx methods are enabled
    implicitly by ACPICA during system initialization.  Second, the
    GPEs without these methods (like GPEs listed by _PRW objects for
    wakeup devices) need to be enabled directly by the code that is
    going to use them (e.g. ACPI power management or device drivers).
    
    In the former case, if the status of a given GPE is set to start
    with, its handler method (either _Lxx or _Exx) needs to be invoked
    to take care of the events (possibly) signaled before the GPE was
    enabled.  In the latter case, however, the first caller of
    acpi_enable_gpe() for a given GPE should not be expected to care
    about any events that might be signaled through it earlier.  In
    that case, it is better to clear the status of the GPE before
    enabling it, to prevent stale events from triggering unwanted
    actions (like spurious system resume, for example).
    
    For this reason, modify acpi_ev_add_gpe_reference() to take an
    additional boolean argument indicating whether or not the GPE
    status needs to be cleared when its reference counter changes from
    zero to one and make acpi_enable_gpe() pass TRUE to it through
    that new argument.
    
    Fixes: 18996f2d ("ACPICA: Events: Stop unconditionally clearing ACPI IRQs during suspend/resume")
    Reported-by: default avatarFurquan Shaikh <furquan@google.com>
    Tested-by: default avatarFurquan Shaikh <furquan@google.com>
    Tested-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    44758baf
evgpeblk.c 13.4 KB