[PATCH v3] media: staging: ipu3-imgu: Set fields before media_entity_pads_init()

[PATCH v3] media: staging: ipu3-imgu: Set fields before media_entity_pads_init()

[Hidenori Kobayashi]

The imgu driver fails to probe with the following message because it
does not set the pad's flags before calling media_entity_pads_init().

[   14.596315] ipu3-imgu 0000:00:05.0: failed initialize subdev media entity (-22)
[   14.596322] ipu3-imgu 0000:00:05.0: failed to register subdev0 ret (-22)
[   14.596327] ipu3-imgu 0000:00:05.0: failed to register pipes (-22)
[   14.596331] ipu3-imgu 0000:00:05.0: failed to create V4L2 devices (-22)

Fix the initialization order so that the driver probe succeeds. The ops
initialization is also moved together for readability.

Fixes: a0ca1627b450 ("media: staging/intel-ipu3: Add v4l2 driver based on media framework")
Cc: <stable@vger.kernel.org> # 6.7
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Hidenori Kobayashi <hidenorik@chromium.org>
---
Changes in v3:
- Add error output to commit message (Thanks again Dan!)
- Link to v2: https://lore.kernel.org/lkml/20240109041500.2790754-1-hidenorik@chromium.org

Changes in v2:
- Add Fixes tag and revise commit message (Thanks Dan!)
- Link to v1: https://lore.kernel.org/lkml/20231228093926.748001-1-hidenorik@chromium.org
---
 drivers/staging/media/ipu3/ipu3-v4l2.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/media/ipu3/ipu3-v4l2.c b/drivers/staging/media/ipu3/ipu3-v4l2.c
index a66f034380c0..3df58eb3e882 100644
--- a/drivers/staging/media/ipu3/ipu3-v4l2.c
+++ b/drivers/staging/media/ipu3/ipu3-v4l2.c
@@ -1069,6 +1069,11 @@ static int imgu_v4l2_subdev_register(struct imgu_device *imgu,
 	struct imgu_media_pipe *imgu_pipe = &imgu->imgu_pipe[pipe];
 
 	/* Initialize subdev media entity */
+	imgu_sd->subdev.entity.ops = &imgu_media_ops;
+	for (i = 0; i < IMGU_NODE_NUM; i++) {
+		imgu_sd->subdev_pads[i].flags = imgu_pipe->nodes[i].output ?
+			MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
+	}
 	r = media_entity_pads_init(&imgu_sd->subdev.entity, IMGU_NODE_NUM,
 				   imgu_sd->subdev_pads);
 	if (r) {
@@ -1076,11 +1081,6 @@ static int imgu_v4l2_subdev_register(struct imgu_device *imgu,
 			"failed initialize subdev media entity (%d)\n", r);
 		return r;
 	}
-	imgu_sd->subdev.entity.ops = &imgu_media_ops;
-	for (i = 0; i < IMGU_NODE_NUM; i++) {
-		imgu_sd->subdev_pads[i].flags = imgu_pipe->nodes[i].output ?
-			MEDIA_PAD_FL_SINK : MEDIA_PAD_FL_SOURCE;
-	}
 
 	/* Initialize subdev */
 	v4l2_subdev_init(&imgu_sd->subdev, &imgu_subdev_ops);
@@ -1177,15 +1177,15 @@ static int imgu_v4l2_node_setup(struct imgu_device *imgu, unsigned int pipe,
 	}
 
 	/* Initialize media entities */
+	node->vdev_pad.flags = node->output ?
+		MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;
+	vdev->entity.ops = NULL;
 	r = media_entity_pads_init(&vdev->entity, 1, &node->vdev_pad);
 	if (r) {
 		dev_err(dev, "failed initialize media entity (%d)\n", r);
 		mutex_destroy(&node->lock);
 		return r;
 	}
-	node->vdev_pad.flags = node->output ?
-		MEDIA_PAD_FL_SOURCE : MEDIA_PAD_FL_SINK;
-	vdev->entity.ops = NULL;
 
 	/* Initialize vbq */
 	vbq->type = node->vdev_fmt.type;
-- 
2.43.0.472.g3155946c3a-goog

Re: [PATCH v3] media: staging: ipu3-imgu: Set fields before media_entity_pads_init()

[Dan Carpenter]

On Tue, Jan 09, 2024 at 05:09:09PM +0900, Hidenori Kobayashi wrote:
> The imgu driver fails to probe with the following message because it
> does not set the pad's flags before calling media_entity_pads_init().
> 
> [   14.596315] ipu3-imgu 0000:00:05.0: failed initialize subdev media entity (-22)
> [   14.596322] ipu3-imgu 0000:00:05.0: failed to register subdev0 ret (-22)
> [   14.596327] ipu3-imgu 0000:00:05.0: failed to register pipes (-22)
> [   14.596331] ipu3-imgu 0000:00:05.0: failed to create V4L2 devices (-22)
> 
> Fix the initialization order so that the driver probe succeeds. The ops
> initialization is also moved together for readability.
> 
> Fixes: a0ca1627b450 ("media: staging/intel-ipu3: Add v4l2 driver based on media framework")
> Cc: <stable@vger.kernel.org> # 6.7
> Cc: Dan Carpenter <dan.carpenter@linaro.org>
> Signed-off-by: Hidenori Kobayashi <hidenorik@chromium.org>
> ---

Thanks so much!

regards,
dan carpenter