Merge remote-tracking branches 'asoc/topic/dwc', 'asoc/topic/es8328', 'asoc/topic...

[karo-tx-linux.git] / drivers / acpi / acpica / tbutils.c

diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index e28553914bf5cc5fcb1da300b493036bc6a83743..86854e84680056e164c6adad591ad772e85a3e79 100644 (file)
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -252,7 +252,8 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
  *
  ******************************************************************************/
 
-acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
+acpi_status ACPI_INIT_FUNCTION
+acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
 {
        struct acpi_table_rsdp *rsdp;
        u32 table_entry_size;
@@ -380,3 +381,88 @@ next_table:
        acpi_os_unmap_memory(table, length);
        return_ACPI_STATUS(AE_OK);
 }
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_get_table
+ *
+ * PARAMETERS:  table_desc          - Table descriptor
+ *              out_table           - Where the pointer to the table is returned
+ *
+ * RETURN:      Status and pointer to the requested table
+ *
+ * DESCRIPTION: Increase a reference to a table descriptor and return the
+ *              validated table pointer.
+ *              If the table descriptor is an entry of the root table list,
+ *              this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_tb_get_table(struct acpi_table_desc *table_desc,
+                 struct acpi_table_header **out_table)
+{
+       acpi_status status;
+
+       ACPI_FUNCTION_TRACE(acpi_tb_get_table);
+
+       if (table_desc->validation_count == 0) {
+
+               /* Table need to be "VALIDATED" */
+
+               status = acpi_tb_validate_table(table_desc);
+               if (ACPI_FAILURE(status)) {
+                       return_ACPI_STATUS(status);
+               }
+       }
+
+       table_desc->validation_count++;
+       if (table_desc->validation_count == 0) {
+               ACPI_ERROR((AE_INFO,
+                           "Table %p, Validation count is zero after increment\n",
+                           table_desc));
+               table_desc->validation_count--;
+               return_ACPI_STATUS(AE_LIMIT);
+       }
+
+       *out_table = table_desc->pointer;
+       return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_tb_put_table
+ *
+ * PARAMETERS:  table_desc          - Table descriptor
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Decrease a reference to a table descriptor and release the
+ *              validated table pointer if no references.
+ *              If the table descriptor is an entry of the root table list,
+ *              this API must be invoked with ACPI_MTX_TABLES acquired.
+ *
+ ******************************************************************************/
+
+void acpi_tb_put_table(struct acpi_table_desc *table_desc)
+{
+
+       ACPI_FUNCTION_TRACE(acpi_tb_put_table);
+
+       if (table_desc->validation_count == 0) {
+               ACPI_WARNING((AE_INFO,
+                             "Table %p, Validation count is zero before decrement\n",
+                             table_desc));
+               return_VOID;
+       }
+       table_desc->validation_count--;
+
+       if (table_desc->validation_count == 0) {
+
+               /* Table need to be "INVALIDATED" */
+
+               acpi_tb_invalidate_table(table_desc);
+       }
+
+       return_VOID;
+}