1 files changed, 94 insertions, 0 deletions

diff --git a/drivers/acpi/utilities/utmisc.c b/drivers/acpi/utilities/utmisc.c
index 207c836aec64..df715cd89105 100644
--- a/drivers/acpi/utilities/utmisc.c
+++ b/drivers/acpi/utilities/utmisc.c
@@ -52,6 +52,100 @@
 
 /*******************************************************************************
  *
+ * FUNCTION:    acpi_ut_allocate_owner_id
+ *
+ * PARAMETERS:  owner_id        - Where the new owner ID is returned
+ *
+ * DESCRIPTION: Allocate a table or method owner id
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_allocate_owner_id (
+        acpi_owner_id                   *owner_id)
+{
+        acpi_native_uint                i;
+        acpi_status                     status;
+
+
+        ACPI_FUNCTION_TRACE ("ut_allocate_owner_id");
+
+
+        status = acpi_ut_acquire_mutex (ACPI_MTX_CACHES);
+        if (ACPI_FAILURE (status)) {
+                return_ACPI_STATUS (status);
+        }
+
+        /* Find a free owner ID */
+
+        for (i = 0; i < 32; i++) {
+                if (!(acpi_gbl_owner_id_mask & (1 << i))) {
+                        acpi_gbl_owner_id_mask |= (1 << i);
+                        *owner_id = (acpi_owner_id) i;
+                        goto exit;
+                }
+        }
+
+        /*
+         * If we are here, all owner_ids have been allocated. This probably should
+         * not happen since the IDs are reused after deallocation. The IDs are
+         * allocated upon table load (one per table) and method execution, and
+         * they are released when a table is unloaded or a method completes
+         * execution.
+         */
+        status = AE_OWNER_ID_LIMIT;
+        ACPI_REPORT_ERROR ((
+                "Could not allocate new owner_id (32 max), AE_OWNER_ID_LIMIT\n"));
+
+exit:
+        (void) acpi_ut_release_mutex (ACPI_MTX_CACHES);
+        return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ut_release_owner_id
+ *
+ * PARAMETERS:  owner_id        - A previously allocated owner ID
+ *
+ * DESCRIPTION: Release a table or method owner id
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_release_owner_id (
+        acpi_owner_id                   owner_id)
+{
+        acpi_status                     status;
+
+
+        ACPI_FUNCTION_TRACE ("ut_release_owner_id");
+
+
+        status = acpi_ut_acquire_mutex (ACPI_MTX_CACHES);
+        if (ACPI_FAILURE (status)) {
+                return_ACPI_STATUS (status);
+        }
+
+        /* Free the owner ID */
+
+        if (acpi_gbl_owner_id_mask & (1 << owner_id)) {
+                acpi_gbl_owner_id_mask ^= (1 << owner_id);
+        }
+        else {
+                /* This owner_id has not been allocated */
+
+                status = AE_NOT_EXIST;
+        }
+
+        (void) acpi_ut_release_mutex (ACPI_MTX_CACHES);
+        return_ACPI_STATUS (status);
+}
+
+
+/*******************************************************************************
+ *
  * FUNCTION:    acpi_ut_strupr (strupr)
  *
  * PARAMETERS:  src_string      - The source string to convert