ACPICA: Events: Enhance acpi_ev_execute_reg_method() to ensure no _REG evaluations can happen during OS early boot stages

ACPICA commit 31178590dde82368fdb0f6b0e466b6c0add96c57

We can ensure no early _REG evaluations by ensuring the following rules in
acpi_ev_execute_reg_method():
1. If an address space handler is installed during early stage,
   _REG(CONNECT) evaluations are blocked. This is achieved using
   acpi_gbl_reg_methods_enabled which is renamed from
   acpi_gbl_reg_methods_executed.
2. If _REG(CONNECT) has never been evalauted for the region object,
   _REG(DISCONNECT) evaluations are blocked. This is achieved by a new
   region object flag: AOPOBJ_REG_CONNECTED.
Note that, after applying this patch, we can ensure _REG(DISCONNECT) is
always paired to _REG(CONNECT). Lv Zheng

Link: https://github.com/acpica/acpica/commit/31178590
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 33 deletions

diff --git a/drivers/acpi/acpica/evxfregn.c b/drivers/acpi/acpica/evxfregn.c
index 3c905085fe5a..29f9f3999dfc 100644
--- a/drivers/acpi/acpica/evxfregn.c
+++ b/drivers/acpi/acpica/evxfregn.c
@@ -112,39 +112,6 @@ acpi_install_address_space_handler(acpi_handle device,
 		goto unlock_and_exit;
 	}
 
-	/*
-	 * 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) {
-
-			/* We will defer execution of the _REG methods for this space */
-
-			goto unlock_and_exit;
-		}
-		break;
-
-	default:
-
-		break;
-	}
-
 	/* Run all _REG methods for this address space */
 
 	status = acpi_ev_execute_reg_methods(node, space_id);