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>

diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c
index cb534fa..82e5c14 100644 (file)
--- 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);