[media] v4l: xilinx: Use the new media graph walk interface

This change “[media] v4l: xilinx: Use the new media graph walk interface” (commit 08613c5) in Linux kernel is authored by Sakari Ailus <sakari.ailus [at] iki.fi> on Wed Dec 16 11:32:26 2015 -0200.

Description of "[media] v4l: xilinx: Use the new media graph walk interface"

The change “[media] v4l: xilinx: Use the new media graph walk interface” introduces changes as follows.

[media] v4l: xilinx: Use the new media graph walk interface

The media graph walk requires initialisation and cleanup soon. Update the
users to perform the soon necessary API calls.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Cc: Hyun Kwon <hyun.kwon@xilinx.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

Linux kernel releases containing commit 08613c5

The Linux kernel releases containing this commit are as follows.

Linux kernel code changes from "[media] v4l: xilinx: Use the new media graph walk interface"

There are 9 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/media/platform/xilinx/xilinx-dma.c | 9 +++++++++
 1 file changed, 9 insertions(+)
 
diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
index 0181ff402a5a..7f6898b13cac 100644
--- a/drivers/media/platform/xilinx/xilinx-dma.c
+++ b/drivers/media/platform/xilinx/xilinx-dma.c
@@ -182,10 +182,17 @@ static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
 	struct media_device *mdev = entity->graph_obj.mdev;
 	unsigned int num_inputs = 0;
 	unsigned int num_outputs = 0;
+	int ret;
 
 	mutex_lock(&mdev->graph_mutex);
 
 	/* Walk the graph to locate the video nodes. */
+	ret = media_entity_graph_walk_init(&graph, entity->graph_obj.mdev);
+	if (ret) {
+		mutex_unlock(&mdev->graph_mutex);
+		return ret;
+	}
+
 	media_entity_graph_walk_start(&graph, entity);
 
 	while ((entity = media_entity_graph_walk_next(&graph))) {
@@ -206,6 +213,8 @@ static int xvip_pipeline_validate(struct xvip_pipeline *pipe,
 
 	mutex_unlock(&mdev->graph_mutex);
 
+	media_entity_graph_walk_cleanup(&graph);
+
 	/* We need exactly one output and zero or one input. */
 	if (num_outputs != 1 || num_inputs > 1)
 		return -EPIPE;

The commit for this change in Linux stable tree is 08613c5 (patch).

Last modified: 2020/02/09