Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...

[linux-2.6-microblaze.git] / drivers / of / base.c

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 4557a14..f72d19b 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2196,64 +2196,65 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
                                        struct device_node *prev)
 {
        struct device_node *endpoint;
-       struct device_node *port = NULL;
+       struct device_node *port;
 
        if (!parent)
                return NULL;
 
+       /*
+        * Start by locating the port node. If no previous endpoint is specified
+        * search for the first port node, otherwise get the previous endpoint
+        * parent port node.
+        */
        if (!prev) {
                struct device_node *node;
-               /*
-                * It's the first call, we have to find a port subnode
-                * within this node or within an optional 'ports' node.
-                */
+
                node = of_get_child_by_name(parent, "ports");
                if (node)
                        parent = node;
 
                port = of_get_child_by_name(parent, "port");
-
-               if (port) {
-                       /* Found a port, get an endpoint. */
-                       endpoint = of_get_next_child(port, NULL);
-                       of_node_put(port);
-               } else {
-                       endpoint = NULL;
-               }
-
-               if (!endpoint)
-                       pr_err("%s(): no endpoint nodes specified for %s\n",
-                              __func__, parent->full_name);
                of_node_put(node);
 
-               return endpoint;
-       }
-
-       port = of_get_parent(prev);
-       if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n",
-                     __func__, prev->full_name))
-               return NULL;
+               if (!port) {
+                       pr_err("%s(): no port node found in %s\n",
+                              __func__, parent->full_name);
+                       return NULL;
+               }
+       } else {
+               port = of_get_parent(prev);
+               if (WARN_ONCE(!port, "%s(): endpoint %s has no parent node\n",
+                             __func__, prev->full_name))
+                       return NULL;
 
-       /* Avoid dropping prev node refcount to 0. */
-       of_node_get(prev);
-       endpoint = of_get_next_child(port, prev);
-       if (endpoint) {
-               of_node_put(port);
-               return endpoint;
+               /*
+                * Avoid dropping prev node refcount to 0 when getting the next
+                * child below.
+                */
+               of_node_get(prev);
        }
 
-       /* No more endpoints under this port, try the next one. */
-       do {
-               port = of_get_next_child(parent, port);
-               if (!port)
-                       return NULL;
-       } while (of_node_cmp(port->name, "port"));
+       while (1) {
+               /*
+                * Now that we have a port node, get the next endpoint by
+                * getting the next child. If the previous endpoint is NULL this
+                * will return the first child.
+                */
+               endpoint = of_get_next_child(port, prev);
+               if (endpoint) {
+                       of_node_put(port);
+                       return endpoint;
+               }
 
-       /* Pick up the first endpoint in this port. */
-       endpoint = of_get_next_child(port, NULL);
-       of_node_put(port);
+               /* No more endpoints under this port, try the next one. */
+               prev = NULL;
 
-       return endpoint;
+               do {
+                       port = of_get_next_child(parent, port);
+                       if (!port)
+                               return NULL;
+               } while (of_node_cmp(port->name, "port"));
+       }
 }
 EXPORT_SYMBOL(of_graph_get_next_endpoint);