[PATCH 13/31] media: au0828 fix au0828_create_media_graph() entity checks

[Shuah Khan]

au0828_create_media_graph() doesn't do any checks to determine,
if vbi_dev, vdev, and input entities have been registered prior
to creating pad links. Checking graph_obj.mdev field works as
the graph_obj.mdev field gets initialized in the entity register
interface. Fix it to check graph_obj.mdev field before creating
pad links.

Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
---
 drivers/media/usb/au0828/au0828-core.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index f46fb43..8ef7c71 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -291,20 +291,27 @@ static int au0828_create_media_graph(struct au0828_dev *dev)
 		if (ret)
 			return ret;
 	}
-	ret = media_create_pad_link(decoder, AU8522_PAD_VID_OUT,
-				    &dev->vdev.entity, 0,
-				    MEDIA_LNK_FL_ENABLED);
-	if (ret)
-		return ret;
-	ret = media_create_pad_link(decoder, AU8522_PAD_VBI_OUT,
-				    &dev->vbi_dev.entity, 0,
-				    MEDIA_LNK_FL_ENABLED);
-	if (ret)
-		return ret;
+	if (dev->vdev.entity.graph_obj.mdev) {
+		ret = media_create_pad_link(decoder, AU8522_PAD_VID_OUT,
+					    &dev->vdev.entity, 0,
+					    MEDIA_LNK_FL_ENABLED);
+		if (ret)
+			return ret;
+	}
+	if (dev->vbi_dev.entity.graph_obj.mdev) {
+		ret = media_create_pad_link(decoder, AU8522_PAD_VBI_OUT,
+					    &dev->vbi_dev.entity, 0,
+					    MEDIA_LNK_FL_ENABLED);
+		if (ret)
+			return ret;
+	}
 
 	for (i = 0; i < AU0828_MAX_INPUT; i++) {
 		struct media_entity *ent = &dev->input_ent[i];
 
+		if (!ent->graph_obj.mdev)
+			continue;
+
 		if (AUVI_INPUT(i).type == AU0828_VMUX_UNDEFINED)
 			break;
 
-- 
2.5.0

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