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path: root/drivers/acpi/events/evregion.c
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Diffstat (limited to 'drivers/acpi/events/evregion.c')
-rw-r--r--drivers/acpi/events/evregion.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/acpi/events/evregion.c b/drivers/acpi/events/evregion.c
index 6da58e776413..b831ec4bcae7 100644
--- a/drivers/acpi/events/evregion.c
+++ b/drivers/acpi/events/evregion.c
@@ -164,6 +164,7 @@ acpi_status acpi_ev_initialize_op_regions(void)
* Run the _REG methods for op_regions in each default address space
*/
for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) {
+
/* TBD: Make sure handler is the DEFAULT handler, otherwise
* _REG will have already been run.
*/
@@ -315,6 +316,7 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
*/
region_setup = handler_desc->address_space.setup;
if (!region_setup) {
+
/* No initialization routine, exit with error */
ACPI_ERROR((AE_INFO,
@@ -361,6 +363,7 @@ acpi_ev_address_space_dispatch(union acpi_operand_object *region_obj,
region_obj->region.flags |= AOPOBJ_SETUP_COMPLETE;
if (region_obj2->extra.region_context) {
+
/* The handler for this region was already installed */
ACPI_MEM_FREE(region_context);
@@ -463,6 +466,7 @@ acpi_ev_detach_region(union acpi_operand_object *region_obj,
handler_obj = region_obj->region.handler;
if (!handler_obj) {
+
/* This region has no handler, all done */
return_VOID;
@@ -474,6 +478,7 @@ acpi_ev_detach_region(union acpi_operand_object *region_obj,
last_obj_ptr = &handler_obj->address_space.region_list;
while (obj_desc) {
+
/* Is this the correct Region? */
if (obj_desc == region_obj) {
@@ -666,6 +671,7 @@ acpi_ev_install_handler(acpi_handle obj_handle,
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
+
/* No object, just exit */
return (AE_OK);
@@ -674,10 +680,12 @@ acpi_ev_install_handler(acpi_handle obj_handle,
/* Devices are handled different than regions */
if (ACPI_GET_OBJECT_TYPE(obj_desc) == ACPI_TYPE_DEVICE) {
+
/* Check if this Device already has a handler for this address space */
next_handler_obj = obj_desc->device.handler;
while (next_handler_obj) {
+
/* Found a handler, is it for the same address space? */
if (next_handler_obj->address_space.space_id ==
@@ -839,6 +847,7 @@ acpi_ev_install_space_handler(struct acpi_namespace_node * node,
/* Walk the handler list for this device */
while (handler_obj) {
+
/* Same space_id indicates a handler already installed */
if (handler_obj->address_space.space_id == space_id) {
@@ -1035,6 +1044,7 @@ acpi_ev_reg_run(acpi_handle obj_handle,
obj_desc = acpi_ns_get_attached_object(node);
if (!obj_desc) {
+
/* No object, just exit */
return (AE_OK);