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[v3,3/7] media: sun4i_csi: Don't use v4l2_subdev_link_validate() for video device

Message ID 20240826124106.3823-4-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State New
Headers show
Series media: v4l2: Improve media link validation | expand

Commit Message

Laurent Pinchart Aug. 26, 2024, 12:41 p.m. UTC 
The v4l2_subdev_link_validate() function is a helper designed to
validate links whose sink is a subdev. When called on a link whose sink
is a video device, it only prints a warning and returns. Its usage in
the sun4i_csi driver is wrong, leaving the link from the sub4i_csi
subdev to the capture video device unvalidated.

Planned improvements to the v4l2_subdev_link_validate() function will
turn the warning into an error, breaking the sun4i_csi driver. As an
interim measure, move the warning to the sun4i_csi driver in a custom
validation handler, and drop the call to the helper.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
---
 drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
index dbb26c7b2f8d..d07e980aba61 100644
--- a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
@@ -35,8 +35,15 @@  struct sun4i_csi_traits {
 	bool has_isp;
 };
 
+static int sun4i_csi_video_link_validate(struct media_link *link)
+{
+	dev_warn_once(link->graph_obj.mdev->dev,
+		      "Driver bug: link validation not implemented\n");
+	return 0;
+}
+
 static const struct media_entity_operations sun4i_csi_video_entity_ops = {
-	.link_validate = v4l2_subdev_link_validate,
+	.link_validate = sun4i_csi_video_link_validate,
 };
 
 static const struct media_entity_operations sun4i_csi_subdev_entity_ops = {