diff options
Diffstat (limited to 'drivers/acpi/acpica/evxfregn.c')
| -rw-r--r-- | drivers/acpi/acpica/evxfregn.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/acpi/acpica/evxfregn.c b/drivers/acpi/acpica/evxfregn.c index eb738676371..c85c8c45599 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); |