drivers/of: Export OF changeset functions

The PowerNV PCI hotplug driver is going to use the OF changeset
to manage the changed device sub-tree. This exports those OF
changeset functions for that.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Rob Herring <robh@kernel.org>

4 files changed, 52 insertions, 27 deletions

diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 53826b84e0ec..c647bd1b6903 100644
--- a/drivers/of/dynamic.c
+++ b/drivers/of/dynamic.c
@@ -646,6 +646,7 @@ void of_changeset_init(struct of_changeset *ocs)
         memset(ocs, 0, sizeof(*ocs));
         INIT_LIST_HEAD(&ocs->entries);
 }
+EXPORT_SYMBOL_GPL(of_changeset_init);
 
 /**
  * of_changeset_destroy - Destroy a changeset
@@ -662,20 +663,9 @@ void of_changeset_destroy(struct of_changeset *ocs)
         list_for_each_entry_safe_reverse(ce, cen, &ocs->entries, node)
                 __of_changeset_entry_destroy(ce);
 }
+EXPORT_SYMBOL_GPL(of_changeset_destroy);
 
-/**
- * of_changeset_apply - Applies a changeset
- *
- * @ocs:        changeset pointer
- *
- * Applies a changeset to the live tree.
- * Any side-effects of live tree state changes are applied here on
- * sucess, like creation/destruction of devices and side-effects
- * like creation of sysfs properties and directories.
- * Returns 0 on success, a negative error value in case of an error.
- * On error the partially applied effects are reverted.
- */
-int of_changeset_apply(struct of_changeset *ocs)
+int __of_changeset_apply(struct of_changeset *ocs)
 {
         struct of_changeset_entry *ce;
         int ret;
@@ -704,17 +694,30 @@ int of_changeset_apply(struct of_changeset *ocs)
 }
 
 /**
- * of_changeset_revert - Reverts an applied changeset
+ * of_changeset_apply - Applies a changeset
  *
  * @ocs:        changeset pointer
  *
- * Reverts a changeset returning the state of the tree to what it
- * was before the application.
- * Any side-effects like creation/destruction of devices and
- * removal of sysfs properties and directories are applied.
+ * Applies a changeset to the live tree.
+ * Any side-effects of live tree state changes are applied here on
+ * success, like creation/destruction of devices and side-effects
+ * like creation of sysfs properties and directories.
  * Returns 0 on success, a negative error value in case of an error.
+ * On error the partially applied effects are reverted.
  */
-int of_changeset_revert(struct of_changeset *ocs)
+int of_changeset_apply(struct of_changeset *ocs)
+{
+        int ret;
+
+        mutex_lock(&of_mutex);
+        ret = __of_changeset_apply(ocs);
+        mutex_unlock(&of_mutex);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(of_changeset_apply);
+
+int __of_changeset_revert(struct of_changeset *ocs)
 {
         struct of_changeset_entry *ce;
         int ret;
@@ -742,6 +745,29 @@ int of_changeset_revert(struct of_changeset *ocs)
 }
 
 /**
+ * of_changeset_revert - Reverts an applied changeset
+ *
+ * @ocs:        changeset pointer
+ *
+ * Reverts a changeset returning the state of the tree to what it
+ * was before the application.
+ * Any side-effects like creation/destruction of devices and
+ * removal of sysfs properties and directories are applied.
+ * Returns 0 on success, a negative error value in case of an error.
+ */
+int of_changeset_revert(struct of_changeset *ocs)
+{
+        int ret;
+
+        mutex_lock(&of_mutex);
+        ret = __of_changeset_revert(ocs);
+        mutex_unlock(&of_mutex);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(of_changeset_revert);
+
+/**
  * of_changeset_action - Perform a changeset action
  *
  * @ocs:        changeset pointer
@@ -779,3 +805,4 @@ int of_changeset_action(struct of_changeset *ocs, unsigned long action,
         list_add_tail(&ce->node, &ocs->entries);
         return 0;
 }
+EXPORT_SYMBOL_GPL(of_changeset_action);
diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h
index 8e882e706cd8..829469faeb23 100644
--- a/drivers/of/of_private.h
+++ b/drivers/of/of_private.h
@@ -45,6 +45,8 @@ static inline struct device_node *kobj_to_device_node(struct kobject *kobj)
 extern int of_property_notify(int action, struct device_node *np,
                               struct property *prop, struct property *old_prop);
 extern void of_node_release(struct kobject *kobj);
+extern int __of_changeset_apply(struct of_changeset *ocs);
+extern int __of_changeset_revert(struct of_changeset *ocs);
 #else /* CONFIG_OF_DYNAMIC */
 static inline int of_property_notify(int action, struct device_node *np,
                                      struct property *prop, struct property *old_prop)
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 54e5af9d7377..82250815e9a5 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -379,9 +379,9 @@ int of_overlay_create(struct device_node *tree)
         }
 
         /* apply the changeset */
-        err = of_changeset_apply(&ov->cset);
+        err = __of_changeset_apply(&ov->cset);
         if (err) {
-                pr_err("%s: of_changeset_apply() failed for tree@%s\n",
+                pr_err("%s: __of_changeset_apply() failed for tree@%s\n",
                                 __func__, tree->full_name);
                 goto err_revert_overlay;
         }
@@ -511,7 +511,7 @@ int of_overlay_destroy(int id)
 
 
         list_del(&ov->node);
-        of_changeset_revert(&ov->cset);
+        __of_changeset_revert(&ov->cset);
         of_free_overlay_info(ov);
         idr_remove(&ov_idr, id);
         of_changeset_destroy(&ov->cset);
@@ -542,7 +542,7 @@ int of_overlay_destroy_all(void)
         /* the tail of list is guaranteed to be safe to remove */
         list_for_each_entry_safe_reverse(ov, ovn, &ov_list, node) {
                 list_del(&ov->node);
-                of_changeset_revert(&ov->cset);
+                __of_changeset_revert(&ov->cset);
                 of_free_overlay_info(ov);
                 idr_remove(&ov_idr, ov->id);
                 kfree(ov);
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index bbff09dee1cf..979b6e415cea 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -530,18 +530,14 @@ static void __init of_unittest_changeset(void)
         unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
         unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
         unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
-        mutex_lock(&of_mutex);
         unittest(!of_changeset_apply(&chgset), "apply failed\n");
-        mutex_unlock(&of_mutex);
 
         /* Make sure node names are constructed correctly */
         unittest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
                  "'%s' not added\n", n21->full_name);
         of_node_put(np);
 
-        mutex_lock(&of_mutex);
         unittest(!of_changeset_revert(&chgset), "revert failed\n");
-        mutex_unlock(&of_mutex);
 
         of_changeset_destroy(&chgset);
 #endif