From 923f7e30b480438f1e86e01e5cde814248b59a39 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Thu, 28 Jan 2010 13:52:53 -0700 Subject: of: Merge of_node_get() and of_node_put() Merge common code between PowerPC and MicroBlaze Signed-off-by: Grant Likely Tested-by: Wolfram Sang Acked-by: Benjamin Herrenschmidt --- drivers/of/base.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) (limited to 'drivers/of') 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) -- cgit v1.2.3