Empty port nodes are allowed but currently unsupported as the
v4l2_of_get_next_endpoint() function assumes that all port nodes have at
least an endpoint. Fix this.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-of.c | 52 +++++++++++++++++++++------------------
1 file changed, 28 insertions(+), 24 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
index 42e3e8a..4c07343 100644
--- a/drivers/media/v4l2-core/v4l2-of.c
+++ b/drivers/media/v4l2-core/v4l2-of.c
@@ -166,43 +166,51 @@ struct device_node *v4l2_of_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");
+ of_node_put(node);
- 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",
+ if (!port) {
+ pr_err("%s(): no port node found in %s\n",
__func__, parent->full_name);
- of_node_put(node);
+ return NULL;
+ }
} else {
port = of_get_parent(prev);
- if (!port)
+ if (!port) {
/* Hm, has someone given us the root node ?... */
return NULL;
+ }
- /* Avoid dropping prev node refcount to 0. */
+ /*
+ * Avoid dropping prev node refcount to 0 when getting the next
+ * child below.
+ */
of_node_get(prev);
+ }
+
+ 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);
@@ -210,18 +218,14 @@ struct device_node *v4l2_of_get_next_endpoint(const struct device_node *parent,
}
/* No more endpoints under this port, try the next one. */
+ prev = NULL;
+
do {
port = of_get_next_child(parent, port);
if (!port)
return NULL;
} while (of_node_cmp(port->name, "port"));
-
- /* Pick up the first endpoint in this port. */
- endpoint = of_get_next_child(port, NULL);
- of_node_put(port);
}
-
- return endpoint;
}
EXPORT_SYMBOL(v4l2_of_get_next_endpoint);
--
1.8.3.2
--
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