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-rw-r--r--drivers/acpi/events/evxfevnt.c8
-rw-r--r--drivers/acpi/tables/tbutils.c23
-rw-r--r--include/acpi/actables.h2
3 files changed, 33 insertions, 0 deletions
diff --git a/drivers/acpi/events/evxfevnt.c b/drivers/acpi/events/evxfevnt.c
index a3d148e4d39f..4eab4f5a1004 100644
--- a/drivers/acpi/events/evxfevnt.c
+++ b/drivers/acpi/events/evxfevnt.c
@@ -65,6 +65,14 @@ acpi_status acpi_enable(void)
ACPI_FUNCTION_TRACE(acpi_enable);
+ /* ACPI tables must be present */
+
+ if (!acpi_tb_tables_loaded()) {
+ return_ACPI_STATUS(AE_NO_ACPI_TABLES);
+ }
+
+ /* Check current mode */
+
if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
ACPI_DEBUG_PRINT((ACPI_DB_INIT,
"System is already in ACPI mode\n"));
diff --git a/drivers/acpi/tables/tbutils.c b/drivers/acpi/tables/tbutils.c
index 0cb743962faf..0874ab299784 100644
--- a/drivers/acpi/tables/tbutils.c
+++ b/drivers/acpi/tables/tbutils.c
@@ -54,6 +54,29 @@ acpi_tb_get_root_table_entry(u8 * table_entry,
/*******************************************************************************
*
+ * FUNCTION: acpi_tb_tables_loaded
+ *
+ * PARAMETERS: None
+ *
+ * RETURN: TRUE if required ACPI tables are loaded
+ *
+ * DESCRIPTION: Determine if the minimum required ACPI tables are present
+ * (FADT, FACS, DSDT)
+ *
+ ******************************************************************************/
+
+u8 acpi_tb_tables_loaded(void)
+{
+
+ if (acpi_gbl_root_table_list.count >= 3) {
+ return (TRUE);
+ }
+
+ return (FALSE);
+}
+
+/*******************************************************************************
+ *
* FUNCTION: acpi_tb_print_table_header
*
* PARAMETERS: Address - Table physical address
diff --git a/include/acpi/actables.h b/include/acpi/actables.h
index 5ef1b6939370..e7efb8a03a9c 100644
--- a/include/acpi/actables.h
+++ b/include/acpi/actables.h
@@ -97,6 +97,8 @@ void acpi_tb_set_table_loaded_flag(acpi_native_uint table_index, u8 is_loaded);
/*
* tbutils - table manager utilities
*/
+u8 acpi_tb_tables_loaded(void);
+
void
acpi_tb_print_table_header(acpi_physical_address address,
struct acpi_table_header *header);
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