[PATCH 04/12] ACPICA: Add new external interface, acpi_unload_table

Erik Schmauss
2019-10-24T19:13:46Z

From: Bob Moore <robert.moore@intel.com>

ACPICA commit c69369cd9cf0134e1aac516e97d612947daa8dc2

Unload a table via the table_index.

Link: https://github.com/acpica/acpica/commit/c69369cd
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
---
drivers/acpi/acpica/tbxfload.c | 32 ++++++++++++++++++++++++++++++++
include/acpi/acpixf.h | 3 +++
2 files changed, 35 insertions(+)

diff --git a/drivers/acpi/acpica/tbxfload.c b/drivers/acpi/acpica/tbxfload.c
index 86f1693f6d29..ce86e7945e90 100644
--- a/drivers/acpi/acpica/tbxfload.c
+++ b/drivers/acpi/acpica/tbxfload.c
@@ -390,3 +390,35 @@ acpi_status acpi_unload_parent_table(acpi_handle object)
}

ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_unload_table
+ *
+ * PARAMETERS: table_index - Index as returned by acpi_load_table
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Via the table_index representing an SSDT or OEMx table, unloads
+ * the table and deletes all namespace objects associated with
+ * that table. Unloading of the DSDT is not allowed.
+ * Note: Mainly intended to support hotplug removal of SSDTs.
+ *
+ ******************************************************************************/
+acpi_status acpi_unload_table(u32 table_index)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(acpi_unload_table);
+
+ if (table_index == 1) {
+
+ /* table_index==1 means DSDT is the owner. DSDT cannot be unloaded */
+
+ return_ACPI_STATUS(AE_TYPE);
+ }
+
+ status = acpi_tb_unload_table(table_index);
+ return_ACPI_STATUS(status);
+}
+
+ACPI_EXPORT_SYMBOL(acpi_unload_table)
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index e5e041413581..109b2f14b6c6 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -460,6 +460,9 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
ACPI_EXTERNAL_RETURN_STATUS(acpi_status
acpi_load_table(struct acpi_table_header *table))

+ACPI_EXTERNAL_RETURN_STATUS(acpi_status
+ acpi_unload_table(u32 table_index))
+
ACPI_EXTERNAL_RETURN_STATUS(acpi_status
acpi_unload_parent_table(acpi_handle object))

--
2.21.0