[PATCH v6 41/42] drivers/of: Export OF changeset functions

Gavin Shan
2015-08-06T04:11:46Z

The PowerNV PCI hotplug driver is going to use the OF changeset
to manage the changed device sub-tree, which requires those OF
changeset functions are exported.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
drivers/of/dynamic.c | 65 ++++++++++++++++++++++++++++++++++++---------------
drivers/of/overlay.c | 8 +++----
drivers/of/unittest.c | 4 ++--
include/linux/of.h | 2 ++
4 files changed, 54 insertions(+), 25 deletions(-)

diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
index 53826b8..af65b5b 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(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(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
+ * 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_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(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(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(of_changeset_action);
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 24e025f..804ea33 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -378,9 +378,9 @@ 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;
}
@@ -508,7 +508,7 @@ 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);
@@ -539,7 +539,7 @@ 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 2270830..06eb3e5 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -527,7 +527,7 @@ static void __init of_unittest_changeset(void)
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");
+ unittest(!__of_changeset_apply(&chgset), "apply failed\n");
mutex_unlock(&of_mutex);

/* Make sure node names are constructed correctly */
@@ -536,7 +536,7 @@ static void __init of_unittest_changeset(void)
of_node_put(np);

mutex_lock(&of_mutex);
- unittest(!of_changeset_revert(&chgset), "revert failed\n");
+ unittest(!__of_changeset_revert(&chgset), "revert failed\n");
mutex_unlock(&of_mutex);

of_changeset_destroy(&chgset);
diff --git a/include/linux/of.h b/include/linux/of.h
index edc068d..5c030e1 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -1001,7 +1001,9 @@ extern int of_reconfig_get_state_change(unsigned long action,

extern void of_changeset_init(struct of_changeset *ocs);
extern void of_changeset_destroy(struct of_changeset *ocs);
+extern int __of_changeset_apply(struct of_changeset *ocs);
extern int of_changeset_apply(struct of_changeset *ocs);
+extern int __of_changeset_revert(struct of_changeset *ocs);
extern int of_changeset_revert(struct of_changeset *ocs);
extern int of_changeset_action(struct of_changeset *ocs,
unsigned long action, struct device_node *np,
--
2.1.0