IBM ThinkPAD T30/T40 oops (David Shaohua Li)

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=98849

drivers/acpi/ec.c

@@ -32,7 +32,7 @@
 #include <asm/io.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
-
+#include <acpi/actypes.h>
 
 #define _COMPONENT		ACPI_EC_COMPONENT
 ACPI_MODULE_NAME		("acpi_ec")
@@ -412,7 +412,10 @@ acpi_ec_space_setup (
 	 * The EC object is in the handler context and is needed
 	 * when calling the acpi_ec_space_handler.
 	 */
-	*return_context = handler_context;
+	if(function == ACPI_REGION_DEACTIVATE) 
+		*return_context = NULL;
+	else 
+		*return_context = handler_context;
 
 	return AE_OK;
 }

drivers/acpi/events/evregion.c

@@ -382,7 +382,7 @@ acpi_ev_detach_region(
 	union acpi_operand_object       *obj_desc;
 	union acpi_operand_object       **last_obj_ptr;
 	acpi_adr_space_setup            region_setup;
-	void                            *region_context;
+	void                            **region_context;
 	union acpi_operand_object       *region_obj2;
 	acpi_status                     status;
 
@@ -394,7 +394,7 @@ acpi_ev_detach_region(
 	if (!region_obj2) {
 		return_VOID;
 	}
-	region_context = region_obj2->extra.region_context;
+	region_context = &region_obj2->extra.region_context;
 
 	/* Get the address handler from the region object */
 
@@ -450,7 +450,7 @@ acpi_ev_detach_region(
 
 			region_setup = handler_obj->address_space.setup;
 			status = region_setup (region_obj, ACPI_REGION_DEACTIVATE,
-					  handler_obj->address_space.context, &region_context);
+					  handler_obj->address_space.context, region_context);
 
 			/* Init routine may fail, Just ignore errors */