On Mon, Jan 25, 2021 at 01:50:25PM -0300, Helen Koike wrote:

On 1/25/21 10:22 AM, Sakari Ailus wrote:

quoted

From: Ezequiel Garcia <redacted>

The use of v4l2_async_notifier_add_subdev will be discouraged.
Drivers are instead encouraged to use a helper such as
v4l2_async_notifier_add_i2c_subdev.

This fixes a misuse of the API, as v4l2_async_notifier_add_subdev
should get a kmalloc'ed struct v4l2_async_subdev,
removing some boilerplate code while at it.

Use the appropriate helper: v4l2_async_notifier_add_i2c_subdev
or v4l2_async_notifier_add_fwnode_remote_subdev, which handles
the needed setup, instead of open-coding it.

Using v4l2-async to allocate the driver-specific structs,
requires to change struct ceu_subdev so the embedded
struct v4l2_async_subdev is now the first element.

Signed-off-by: Ezequiel Garcia <redacted>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
 drivers/media/platform/renesas-ceu.c | 60 +++++++++++++---------------
 1 file changed, 27 insertions(+), 33 deletions(-)

diff --git a/drivers/media/platform/renesas-ceu.c b/drivers/media/platform/renesas-ceu.c
index 4a633ad0e8fa..0298d08b39e4 100644
--- a/drivers/media/platform/renesas-ceu.c
+++ b/drivers/media/platform/renesas-ceu.c

@@ -152,8 +152,8 @@ static inline struct ceu_buffer *vb2_to_ceu(struct vb2_v4l2_buffer *vbuf)
  * ceu_subdev - Wraps v4l2 sub-device and provides async subdevice.
  */
 struct ceu_subdev {
-	struct v4l2_subdev *v4l2_sd;
 	struct v4l2_async_subdev asd;
+	struct v4l2_subdev *v4l2_sd;
 
 	/* per-subdevice mbus configuration options */
 	unsigned int mbus_flags;

@@ -174,7 +174,7 @@ struct ceu_device {
 	struct v4l2_device	v4l2_dev;
 
 	/* subdevices descriptors */
-	struct ceu_subdev	*subdevs;
+	struct ceu_subdev	**subdevs;
 	/* the subdevice currently in use */
 	struct ceu_subdev	*sd;
 	unsigned int		sd_index;

@@ -1195,7 +1195,7 @@ static int ceu_enum_input(struct file *file, void *priv,
 	if (inp->index >= ceudev->num_sd)
 		return -EINVAL;
 
-	ceusd = &ceudev->subdevs[inp->index];
+	ceusd = ceudev->subdevs[inp->index];
 
 	inp->type = V4L2_INPUT_TYPE_CAMERA;
 	inp->std = 0;

@@ -1230,7 +1230,7 @@ static int ceu_s_input(struct file *file, void *priv, unsigned int i)
 		return 0;
 
 	ceu_sd_old = ceudev->sd;
-	ceudev->sd = &ceudev->subdevs[i];
+	ceudev->sd = ceudev->subdevs[i];
 
 	/*
 	 * Make sure we can generate output image formats and apply

@@ -1423,7 +1423,7 @@ static int ceu_notify_complete(struct v4l2_async_notifier *notifier)
 	 * ceu formats.
 	 */
 	if (!ceudev->sd) {
-		ceudev->sd = &ceudev->subdevs[0];
+		ceudev->sd = ceudev->subdevs[0];
 		ceudev->sd_index = 0;
 	}
 

@@ -1467,8 +1467,8 @@ static const struct v4l2_async_notifier_operations ceu_notify_ops = {
 
 /*
  * ceu_init_async_subdevs() - Initialize CEU subdevices and async_subdevs in
- *			      ceu device. Both DT and platform data parsing use
- *			      this routine.
+ *                           ceu device. Both DT and platform data parsing use
+ *                           this routine.

Maybe doc alignment fix should be sent in another patch.

With or without this:

Reviewed-by: Helen Koike <redacted>

Thanks; I prefer keeping it here, not worth writing a patch just for this.

-- 
Sakari Ailus