ACPICA: GPEs: Do not allow enable for GPEs that have no handler(s).

ACPICA commit 23b5a8542283af28c3a3a4e3f81096d6e2569faa

There is no point in enabling a GPE that has no handler or
GPE method. At worst, it can cause GPE floods.
Rafael Wysocki.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c
index cb534faf5369..82e5c146bdd4 100644
--- a/drivers/acpi/acpica/evxfgpe.c
+++ b/drivers/acpi/acpica/evxfgpe.c
@@ -126,11 +126,19 @@ acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 
         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 
-        /* Ensure that we have a valid GPE number */
-
+        /*
+         * Ensure that we have a valid GPE number and that there is some way
+         * of handling the GPE (handler or a GPE method). In other words, we
+         * won't allow a valid GPE to be enabled if there is no way to handle it.
+         */
         gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
         if (gpe_event_info) {
-                status = acpi_ev_add_gpe_reference(gpe_event_info);
+                if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
+                    ACPI_GPE_DISPATCH_NONE) {
+                        status = acpi_ev_add_gpe_reference(gpe_event_info);
+                } else {
+                        status = AE_NO_HANDLER;
+                }
         }
 
         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);