• R
    ACPI / ACPICA: Fix low-level GPE manipulation code · fd247447
    Rafael J. Wysocki 提交于
    ACPICA uses acpi_ev_enable_gpe() for enabling GPEs at the low level,
    which is incorrect, because this function only enables the GPE if the
    corresponding bit in its enable register's enable_for_run mask is set.
    This causes acpi_set_gpe() to work incorrectly if used for enabling
    GPEs that were not previously enabled with acpi_enable_gpe().  As a
    result, among other things, wakeup-only GPEs are never enabled by
    acpi_enable_wakeup_device(), so the devices that use them are unable
    to wake up the system.
    
    To fix this issue remove acpi_ev_enable_gpe() and its counterpart
    acpi_ev_disable_gpe() and replace acpi_hw_low_disable_gpe() with
    acpi_hw_low_set_gpe() that will be used instead to manipulate GPE
    enable bits at the low level.  Make the users of acpi_ev_enable_gpe()
    and acpi_ev_disable_gpe() call acpi_hw_low_set_gpe() instead and
    make sure that GPE enable masks are only updated by acpi_enable_gpe()
    and acpi_disable_gpe() when GPE reference counters change from 0
    to 1 and from 1 to 0, respectively.
    Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
    Signed-off-by: NLen Brown <len.brown@intel.com>
    fd247447
achware.h 4.6 KB