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authorGrant Likely <grant.likely@secretlab.ca>2010-01-28 13:52:53 -0700
committerGrant Likely <grant.likely@secretlab.ca>2010-01-28 13:52:53 -0700
commit923f7e30b480438f1e86e01e5cde814248b59a39 (patch)
treead9cb0e701b0a8ef2ac5113fbd4a42118039edd6 /drivers
parent1f43cfb9474d1c4f22598b6e3213ec035be6dd56 (diff)
downloadvexpress-lsk-923f7e30b480438f1e86e01e5cde814248b59a39.tar.gz
of: Merge of_node_get() and of_node_put()
Merge common code between PowerPC and MicroBlaze Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Wolfram Sang <w.sang@pengutronix.de> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/of/base.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index dba995b70b8..cf89ee6253f 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -60,6 +60,81 @@ int of_n_size_cells(struct device_node *np)
}
EXPORT_SYMBOL(of_n_size_cells);
+#if !defined(CONFIG_SPARC) /* SPARC doesn't do ref counting (yet) */
+/**
+ * of_node_get - Increment refcount of a node
+ * @node: Node to inc refcount, NULL is supported to
+ * simplify writing of callers
+ *
+ * Returns node.
+ */
+struct device_node *of_node_get(struct device_node *node)
+{
+ if (node)
+ kref_get(&node->kref);
+ return node;
+}
+EXPORT_SYMBOL(of_node_get);
+
+static inline struct device_node *kref_to_device_node(struct kref *kref)
+{
+ return container_of(kref, struct device_node, kref);
+}
+
+/**
+ * of_node_release - release a dynamically allocated node
+ * @kref: kref element of the node to be released
+ *
+ * In of_node_put() this function is passed to kref_put()
+ * as the destructor.
+ */
+static void of_node_release(struct kref *kref)
+{
+ struct device_node *node = kref_to_device_node(kref);
+ struct property *prop = node->properties;
+
+ /* We should never be releasing nodes that haven't been detached. */
+ if (!of_node_check_flag(node, OF_DETACHED)) {
+ pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name);
+ dump_stack();
+ kref_init(&node->kref);
+ return;
+ }
+
+ if (!of_node_check_flag(node, OF_DYNAMIC))
+ return;
+
+ while (prop) {
+ struct property *next = prop->next;
+ kfree(prop->name);
+ kfree(prop->value);
+ kfree(prop);
+ prop = next;
+
+ if (!prop) {
+ prop = node->deadprops;
+ node->deadprops = NULL;
+ }
+ }
+ kfree(node->full_name);
+ kfree(node->data);
+ kfree(node);
+}
+
+/**
+ * of_node_put - Decrement refcount of a node
+ * @node: Node to dec refcount, NULL is supported to
+ * simplify writing of callers
+ *
+ */
+void of_node_put(struct device_node *node)
+{
+ if (node)
+ kref_put(&node->kref, of_node_release);
+}
+EXPORT_SYMBOL(of_node_put);
+#endif /* !CONFIG_SPARC */
+
struct property *of_find_property(const struct device_node *np,
const char *name,
int *lenp)