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-rw-r--r--drivers/acpi/acpica/evxfregn.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/evxfregn.c b/drivers/acpi/acpica/evxfregn.c
index eb73867..c85c8c4 100644
--- a/drivers/acpi/acpica/evxfregn.c
+++ b/drivers/acpi/acpica/evxfregn.c
@@ -110,9 +110,39 @@ acpi_install_address_space_handler(acpi_handle device,
goto unlock_and_exit;
}
- /* Run all _REG methods for this address space */
+ /*
+ * For the default space_iDs, (the IDs for which there are default region handlers
+ * installed) Only execute the _REG methods if the global initialization _REG
+ * methods have already been run (via acpi_initialize_objects). In other words,
+ * we will defer the execution of the _REG methods for these space_iDs until
+ * execution of acpi_initialize_objects. This is done because we need the handlers
+ * for the default spaces (mem/io/pci/table) to be installed before we can run
+ * any control methods (or _REG methods). There is known BIOS code that depends
+ * on this.
+ *
+ * For all other space_iDs, we can safely execute the _REG methods immediately.
+ * This means that for IDs like embedded_controller, this function should be called
+ * only after acpi_enable_subsystem has been called.
+ */
+ switch (space_id) {
+ case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+ case ACPI_ADR_SPACE_SYSTEM_IO:
+ case ACPI_ADR_SPACE_PCI_CONFIG:
+ case ACPI_ADR_SPACE_DATA_TABLE:
+
+ if (acpi_gbl_reg_methods_executed) {
+
+ /* Run all _REG methods for this address space */
+
+ status = acpi_ev_execute_reg_methods(node, space_id);
+ }
+ break;
+
+ default:
- status = acpi_ev_execute_reg_methods(node, space_id);
+ status = acpi_ev_execute_reg_methods(node, space_id);
+ break;
+ }
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);