[PATCH] ACPICA: make acpi_load_table() return table index

[Nikolaus Voss]

For unloading an ACPI table, it is necessary to provide the
index of the table. The method intended for dynamically
loading or hotplug addition of tables, acpi_load_table(),
should provide this information via an optional pointer
to the loaded table index.

This patch fixes the table unload function of acpi_configfs.

Reported-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Fixes: d06c47e3dd07f ("ACPI: configfs: Resolve objects on host-directed table loads")
Signed-off-by: Nikolaus Voss <nikolaus.voss@xxxxxxxxxxxxxxxxxxxxx>
---
 drivers/acpi/acpi_configfs.c   | 2 +-
 drivers/acpi/acpica/dbfileio.c | 2 +-
 drivers/acpi/acpica/tbxfload.c | 8 ++++++--
 drivers/firmware/efi/efi.c     | 2 +-
 include/acpi/acpixf.h          | 3 ++-
 5 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/acpi_configfs.c b/drivers/acpi/acpi_configfs.c
index 57d9d574d4dde..77f81242a28e6 100644
--- a/drivers/acpi/acpi_configfs.c
+++ b/drivers/acpi/acpi_configfs.c
@@ -53,7 +53,7 @@ static ssize_t acpi_table_aml_write(struct config_item *cfg,
 	if (!table->header)
 		return -ENOMEM;
 
-	ret = acpi_load_table(table->header);
+	ret = acpi_load_table(table->header, &table->index);
 	if (ret) {
 		kfree(table->header);
 		table->header = NULL;
diff --git a/drivers/acpi/acpica/dbfileio.c b/drivers/acpi/acpica/dbfileio.c
index c6e25734dc5cd..e1b6e54a96ac1 100644
--- a/drivers/acpi/acpica/dbfileio.c
+++ b/drivers/acpi/acpica/dbfileio.c
@@ -93,7 +93,7 @@ acpi_status acpi_db_load_tables(struct acpi_new_table_desc *list_head)
 	while (table_list_head) {
 		table = table_list_head->table;
 
-		status = acpi_load_table(table);
+		status = acpi_load_table(table, NULL);
 		if (ACPI_FAILURE(status)) {
 			if (status == AE_ALREADY_EXISTS) {
 				acpi_os_printf
diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
index 86f1693f6d29a..d08cd8ffcbdb6 100644
--- a/drivers/acpi/acpica/tbxfload.c
+++ b/drivers/acpi/acpica/tbxfload.c
@@ -268,7 +268,8 @@ ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
  *
  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
  *                                    table to be loaded.
- *
+ *              table_idx           - Pointer to a u32 for storing the table
+ *                                    index, might be NULL
  * RETURN:      Status
  *
  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
@@ -278,7 +279,7 @@ ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
  *              to ensure that the table is not deleted or unmapped.
  *
  ******************************************************************************/
-acpi_status acpi_load_table(struct acpi_table_header *table)
+acpi_status acpi_load_table(struct acpi_table_header *table, u32 *table_idx)
 {
 	acpi_status status;
 	u32 table_index;
@@ -297,6 +298,9 @@ acpi_status acpi_load_table(struct acpi_table_header *table)
 	status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 						ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 						FALSE, &table_index);
+	if (table_idx)
+		*table_idx = table_index;
+
 	if (ACPI_SUCCESS(status)) {
 
 		/* Complete the initialization/resolution of new objects */
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index ad3b1f4866b35..9773e4212baef 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -308,7 +308,7 @@ static __init int efivar_ssdt_load(void)
 			goto free_data;
 		}
 
-		ret = acpi_load_table(data);
+		ret = acpi_load_table(data, NULL);
 		if (ret) {
 			pr_err("failed to load table: %d\n", ret);
 			goto free_data;
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 3845c8fcc94e5..c90bbdc4146a6 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -452,7 +452,8 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
 					       u8 physical))
 
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
-			    acpi_load_table(struct acpi_table_header *table))
+			    acpi_load_table(struct acpi_table_header *table,
+					    u32 *table_idx))
 
 ACPI_EXTERNAL_RETURN_STATUS(acpi_status
 			    acpi_unload_parent_table(acpi_handle object))
-- 
2.17.1