ACPICA: Tables: Fix FADT dependency regression

Some logics actually relying on the existence of FADT, currently relies on
the number of loaded tables. This false dependency can easily trigger
regressions. One of them has been introduced by commit 8ec3f459073e
(ACPICA: Tables: Fix global table list issues by removing fixed table).

The commit changing the fixed table indexes results in the change of FADT
table index, originally, it was 3 (thus the installed table count should be
greater than 4), while currently it is 0 (and the installed table count may
be 3).

This patch fixes this regression by cleaning up the code. Lv Zheng.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=105351
Fixes: 8ec3f459073e (ACPICA: Tables: Fix global table list issues by removing fixed table)
Reported-and-tested-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index 09f37b51680871d8a34dc3a33563872652d4f0d6..4dde37c3d8fcba549ad1eb978bf23466321e9152 100644 (file)
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -61,6 +61,7 @@ ACPI_GLOBAL(struct acpi_table_header, acpi_gbl_original_dsdt_header);
 ACPI_INIT_GLOBAL(u32, acpi_gbl_dsdt_index, ACPI_INVALID_TABLE_INDEX);
 ACPI_INIT_GLOBAL(u32, acpi_gbl_facs_index, ACPI_INVALID_TABLE_INDEX);
 ACPI_INIT_GLOBAL(u32, acpi_gbl_xfacs_index, ACPI_INVALID_TABLE_INDEX);
+ACPI_INIT_GLOBAL(u32, acpi_gbl_fadt_index, ACPI_INVALID_TABLE_INDEX);
 
 #if (!ACPI_REDUCED_HARDWARE)
 ACPI_GLOBAL(struct acpi_table_facs *, acpi_gbl_FACS);

diff --git a/drivers/acpi/acpica/actables.h b/drivers/acpi/acpica/actables.h
index f7731f260c318606e32455b7175a01ea157d8267..591ea95319e25ca7e5630970dd080ab1eab85e5e 100644 (file)
--- a/drivers/acpi/acpica/actables.h
+++ b/drivers/acpi/acpica/actables.h
@@ -85,7 +85,7 @@ void acpi_tb_set_table_loaded_flag(u32 table_index, u8 is_loaded);
 /*
  * tbfadt - FADT parse/convert/validate
  */
-void acpi_tb_parse_fadt(u32 table_index);
+void acpi_tb_parse_fadt(void);
 
 void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length);
 
@@ -138,8 +138,6 @@ acpi_status acpi_tb_get_owner_id(u32 table_index, acpi_owner_id *owner_id);
  */
 acpi_status acpi_tb_initialize_facs(void);
 
-u8 acpi_tb_tables_loaded(void);
-
 void
 acpi_tb_print_table_header(acpi_physical_address address,
                           struct acpi_table_header *header);

diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index faad911d46b5eb71c4ae93a5300cf460e63c8738..10ce48e16ebf43a334fdc2f13479572d9bca4bd1 100644 (file)
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -71,7 +71,7 @@ acpi_status acpi_enable(void)
 
        /* ACPI tables must be present */
 
-       if (!acpi_tb_tables_loaded()) {
+       if (acpi_gbl_fadt_index == ACPI_INVALID_TABLE_INDEX) {
                return_ACPI_STATUS(AE_NO_ACPI_TABLES);
        }
 

diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 455a0700db392b1663a16c392d8da3bb544b72b6..a6454f4a6fb343b52cada9dc5394094768c6ea14 100644 (file)
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -298,7 +298,7 @@ acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
  *
  * FUNCTION:    acpi_tb_parse_fadt
  *
- * PARAMETERS:  table_index         - Index for the FADT
+ * PARAMETERS:  None
  *
  * RETURN:      None
  *
@@ -307,7 +307,7 @@ acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
  *
  ******************************************************************************/
 
-void acpi_tb_parse_fadt(u32 table_index)
+void acpi_tb_parse_fadt(void)
 {
        u32 length;
        struct acpi_table_header *table;
@@ -319,11 +319,11 @@ void acpi_tb_parse_fadt(u32 table_index)
         * Get a local copy of the FADT and convert it to a common format
         * Map entire FADT, assumed to be smaller than one page.
         */
-       length = acpi_gbl_root_table_list.tables[table_index].length;
+       length = acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index].length;
 
        table =
-           acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
-                              address, length);
+           acpi_os_map_memory(acpi_gbl_root_table_list.
+                              tables[acpi_gbl_fadt_index].address, length);
        if (!table) {
                return;
        }

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 4337990127cc39930b50983d7e7eff05966fcfb6..d8ddef38c947f750a226cee1b69fa373c9e1bf8f 100644 (file)
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -97,29 +97,6 @@ acpi_status acpi_tb_initialize_facs(void)
 }
 #endif                         /* !ACPI_REDUCED_HARDWARE */
 
-/*******************************************************************************
- *
- * 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.current_table_count >= 4) {
-               return (TRUE);
-       }
-
-       return (FALSE);
-}
-
 /*******************************************************************************
  *
  * FUNCTION:    acpi_tb_check_dsdt_header
@@ -392,7 +369,8 @@ acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
                    ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
                                      tables[table_index].signature,
                                      ACPI_SIG_FADT)) {
-                       acpi_tb_parse_fadt(table_index);
+                       acpi_gbl_fadt_index = table_index;
+                       acpi_tb_parse_fadt();
                }
 
 next_table: