media: v4l2-async: Improve v4l2_async_notifier_add_*_subdev() API

The functions that add an async subdev to an async subdev notifier take
as an argument the size of the container structure they need to
allocate. This is error prone, as passing an invalid size will not be
caught by the compiler. Wrap those functions in macros that take a
container type instead of a size, and cast the returned pointer to the
desired type. The compiler will catch mistakes if the incorrect type is
passed to the macro, as the assignment types won't match.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Helen Koike <helen.koike@collabora.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> (core+ti-cal)
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

33 files changed, 113 insertions, 118 deletions

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index b1e2476d3c9e..fd2151f2fa36 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -576,19 +576,19 @@ static int max9286_v4l2_notifier_register(struct max9286_priv *priv)
 
 	for_each_source(priv, source) {
 		unsigned int i = to_index(priv, source);
-		struct v4l2_async_subdev *asd;
+		struct max9286_asd *mas;
 
-		asd = v4l2_async_notifier_add_fwnode_subdev(&priv->notifier,
+		mas = v4l2_async_notifier_add_fwnode_subdev(&priv->notifier,
 							    source->fwnode,
-							    sizeof(struct max9286_asd));
-		if (IS_ERR(asd)) {
+							    struct max9286_asd);
+		if (IS_ERR(mas)) {
 			dev_err(dev, "Failed to add subdev for source %u: %ld",
-				i, PTR_ERR(asd));
+				i, PTR_ERR(mas));
 			v4l2_async_notifier_cleanup(&priv->notifier);
-			return PTR_ERR(asd);
+			return PTR_ERR(mas);
 		}
 
-		to_max9286_asd(asd)->source = source;
+		mas->source = source;
 	}
 
 	priv->notifier.ops = &max9286_notify_ops;
diff --git a/drivers/media/i2c/st-mipid02.c b/drivers/media/i2c/st-mipid02.c
index bb32a5278a4e..7f07ef56fbbd 100644
--- a/drivers/media/i2c/st-mipid02.c
+++ b/drivers/media/i2c/st-mipid02.c
@@ -879,7 +879,7 @@ static int mipid02_parse_rx_ep(struct mipid02_dev *bridge)
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
 					&bridge->notifier,
 					of_fwnode_handle(ep_node),
-					sizeof(*asd));
+					struct v4l2_async_subdev);
 	of_node_put(ep_node);
 
 	if (IS_ERR(asd)) {
diff --git a/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c b/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
index 0895c199de3e..6e8c0c230e11 100644
--- a/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
+++ b/drivers/media/pci/intel/ipu3/ipu3-cio2-main.c
@@ -1465,7 +1465,6 @@ static int cio2_parse_firmware(struct cio2_device *cio2)
 			.bus_type = V4L2_MBUS_CSI2_DPHY
 		};
 		struct sensor_async_subdev *s_asd;
-		struct v4l2_async_subdev *asd;
 		struct fwnode_handle *ep;
 
 		ep = fwnode_graph_get_endpoint_by_id(
@@ -1479,14 +1478,13 @@ static int cio2_parse_firmware(struct cio2_device *cio2)
 		if (ret)
 			goto err_parse;
 
-		asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-				&cio2->notifier, ep, sizeof(*s_asd));
-		if (IS_ERR(asd)) {
-			ret = PTR_ERR(asd);
+		s_asd = v4l2_async_notifier_add_fwnode_remote_subdev(
+				&cio2->notifier, ep, struct sensor_async_subdev);
+		if (IS_ERR(s_asd)) {
+			ret = PTR_ERR(s_asd);
 			goto err_parse;
 		}
 
-		s_asd = container_of(asd, struct sensor_async_subdev, asd);
 		s_asd->csi2.port = vep.base.port;
 		s_asd->csi2.lanes = vep.bus.mipi_csi2.num_data_lanes;
 
diff --git a/drivers/media/platform/am437x/am437x-vpfe.c b/drivers/media/platform/am437x/am437x-vpfe.c
index 0fb9f9ba1219..6cdc77dda0e4 100644
--- a/drivers/media/platform/am437x/am437x-vpfe.c
+++ b/drivers/media/platform/am437x/am437x-vpfe.c
@@ -2365,7 +2365,7 @@ vpfe_get_pdata(struct vpfe_device *vpfe)
 
 		pdata->asd[i] = v4l2_async_notifier_add_fwnode_subdev(
 			&vpfe->notifier, of_fwnode_handle(rem),
-			sizeof(struct v4l2_async_subdev));
+			struct v4l2_async_subdev);
 		of_node_put(rem);
 		if (IS_ERR(pdata->asd[i]))
 			goto cleanup;
diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
index c1a6dd7af002..0514be6153df 100644
--- a/drivers/media/platform/atmel/atmel-isi.c
+++ b/drivers/media/platform/atmel/atmel-isi.c
@@ -1150,7 +1150,7 @@ static int isi_graph_init(struct atmel_isi *isi)
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
 						&isi->notifier,
 						of_fwnode_handle(ep),
-						sizeof(*asd));
+						struct v4l2_async_subdev);
 	of_node_put(ep);
 
 	if (IS_ERR(asd))
diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
index 9ee2cd194f93..0b78fecfd2a8 100644
--- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
+++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
@@ -214,7 +214,7 @@ static int atmel_isc_probe(struct platform_device *pdev)
 		asd = v4l2_async_notifier_add_fwnode_remote_subdev(
 					&subdev_entity->notifier,
 					of_fwnode_handle(subdev_entity->epn),
-					sizeof(*asd));
+					struct v4l2_async_subdev);
 
 		of_node_put(subdev_entity->epn);
 		subdev_entity->epn = NULL;
diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 7d299cacef8c..c68a3eac62cd 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -398,7 +398,8 @@ static int csi2rx_parse_dt(struct csi2rx_priv *csi2rx)
 	v4l2_async_notifier_init(&csi2rx->notifier);
 
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(&csi2rx->notifier,
-							   fwh, sizeof(*asd));
+							   fwh,
+							   struct v4l2_async_subdev);
 	of_node_put(ep);
 	if (IS_ERR(asd))
 		return PTR_ERR(asd);
diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 72a0e94e2e21..8d2e165bf7de 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -1584,7 +1584,7 @@ vpif_capture_get_pdata(struct platform_device *pdev)
 
 		pdata->asd[i] = v4l2_async_notifier_add_fwnode_subdev(
 			&vpif_obj.notifier, of_fwnode_handle(rem),
-			sizeof(struct v4l2_async_subdev));
+			struct v4l2_async_subdev);
 		if (IS_ERR(pdata->asd[i]))
 			goto err_cleanup;
 
diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index f4687b0cbd65..8e1e892085ec 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -465,7 +465,8 @@ static int fimc_md_parse_one_endpoint(struct fimc_md *fmd,
 	}
 
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-		&fmd->subdev_notifier, of_fwnode_handle(ep), sizeof(*asd));
+		&fmd->subdev_notifier, of_fwnode_handle(ep),
+		struct v4l2_async_subdev);
 
 	of_node_put(ep);
 
diff --git a/drivers/media/platform/marvell-ccic/cafe-driver.c b/drivers/media/platform/marvell-ccic/cafe-driver.c
index 91d65f71be96..9c94a8b58b7c 100644
--- a/drivers/media/platform/marvell-ccic/cafe-driver.c
+++ b/drivers/media/platform/marvell-ccic/cafe-driver.c
@@ -552,7 +552,7 @@ static int cafe_pci_probe(struct pci_dev *pdev,
 	asd = v4l2_async_notifier_add_i2c_subdev(&mcam->notifier,
 					i2c_adapter_id(cam->i2c_adapter),
 					ov7670_info.addr,
-					sizeof(*asd));
+					struct v4l2_async_subdev);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
 		goto out_smbus_shutdown;
diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
index 40d9fc4a731a..f2f09cea751d 100644
--- a/drivers/media/platform/marvell-ccic/mmp-driver.c
+++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
@@ -241,8 +241,8 @@ static int mmpcam_probe(struct platform_device *pdev)
 
 	v4l2_async_notifier_init(&mcam->notifier);
 
-	asd = v4l2_async_notifier_add_fwnode_remote_subdev(&mcam->notifier,
-							   ep, sizeof(*asd));
+	asd = v4l2_async_notifier_add_fwnode_remote_subdev(&mcam->notifier, ep,
+							   struct v4l2_async_subdev);
 	fwnode_handle_put(ep);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 1311b4996ece..a6bb7d9bf75f 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -2141,7 +2141,6 @@ static int isp_parse_of_endpoints(struct isp_device *isp)
 {
 	struct fwnode_handle *ep;
 	struct isp_async_subdev *isd = NULL;
-	struct v4l2_async_subdev *asd;
 	unsigned int i;
 
 	ep = fwnode_graph_get_endpoint_by_id(
@@ -2159,12 +2158,10 @@ static int isp_parse_of_endpoints(struct isp_device *isp)
 		ret = v4l2_fwnode_endpoint_parse(ep, &vep);
 
 		if (!ret) {
-			asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-				&isp->notifier, ep, sizeof(*isd));
-			if (!IS_ERR(asd)) {
-				isd = container_of(asd, struct isp_async_subdev, asd);
+			isd = v4l2_async_notifier_add_fwnode_remote_subdev(
+				&isp->notifier, ep, struct isp_async_subdev);
+			if (!IS_ERR(isd))
 				isp_parse_of_parallel_endpoint(isp->dev, &vep, &isd->bus);
-			}
 		}
 
 		fwnode_handle_put(ep);
@@ -2200,12 +2197,10 @@ static int isp_parse_of_endpoints(struct isp_device *isp)
 		}
 
 		if (!ret) {
-			asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-				&isp->notifier, ep, sizeof(*isd));
-
-			if (!IS_ERR(asd)) {
-				isd = container_of(asd, struct isp_async_subdev, asd);
+			isd = v4l2_async_notifier_add_fwnode_remote_subdev(
+				&isp->notifier, ep, struct isp_async_subdev);
 
+			if (!IS_ERR(isd)) {
 				switch (vep.bus_type) {
 				case V4L2_MBUS_CSI2_DPHY:
 					isd->bus.interface =
diff --git a/drivers/media/platform/pxa_camera.c b/drivers/media/platform/pxa_camera.c
index b579ce2e93b6..7f92de351c52 100644
--- a/drivers/media/platform/pxa_camera.c
+++ b/drivers/media/platform/pxa_camera.c
@@ -2259,7 +2259,7 @@ static int pxa_camera_pdata_from_dt(struct device *dev,
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
 				&pcdev->notifier,
 				of_fwnode_handle(np),
-				sizeof(*asd));
+				struct v4l2_async_subdev);
 	if (IS_ERR(asd))
 		err = PTR_ERR(asd);
 out:
@@ -2309,7 +2309,7 @@ static int pxa_camera_probe(struct platform_device *pdev)
 				&pcdev->notifier,
 				pcdev->pdata->sensor_i2c_adapter_id,
 				pcdev->pdata->sensor_i2c_address,
-				sizeof(*asd));
+				struct v4l2_async_subdev);
 		if (IS_ERR(asd))
 			err = PTR_ERR(asd);
 	} else if (pdev->dev.of_node) {
diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c
index 8fefce57bc49..7c0f669f8aa6 100644
--- a/drivers/media/platform/qcom/camss/camss.c
+++ b/drivers/media/platform/qcom/camss/camss.c
@@ -655,7 +655,6 @@ static int camss_of_parse_ports(struct camss *camss)
 
 	for_each_endpoint_of_node(dev->of_node, node) {
 		struct camss_async_subdev *csd;
-		struct v4l2_async_subdev *asd;
 
 		if (!of_device_is_available(node))
 			continue;
@@ -667,17 +666,15 @@ static int camss_of_parse_ports(struct camss *camss)
 			goto err_cleanup;
 		}
 
-		asd = v4l2_async_notifier_add_fwnode_subdev(
+		csd = v4l2_async_notifier_add_fwnode_subdev(
 			&camss->notifier, of_fwnode_handle(remote),
-			sizeof(*csd));
+			struct camss_async_subdev);
 		of_node_put(remote);
-		if (IS_ERR(asd)) {
-			ret = PTR_ERR(asd);
+		if (IS_ERR(csd)) {
+			ret = PTR_ERR(csd);
 			goto err_cleanup;
 		}
 
-		csd = container_of(asd, struct camss_async_subdev, asd);
-
 		ret = camss_of_parse_endpoint_node(dev, node, csd);
 		if (ret < 0)
 			goto err_cleanup;
diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index e48d666f2c63..cb3025992817 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -642,7 +642,7 @@ static int rvin_parallel_parse_of(struct rvin_dev *vin)
 	}
 
 	asd = v4l2_async_notifier_add_fwnode_subdev(&vin->notifier, fwnode,
-						    sizeof(*asd));
+						    struct v4l2_async_subdev);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
 		goto out;
@@ -842,7 +842,8 @@ static int rvin_mc_parse_of(struct rvin_dev *vin, unsigned int id)
 	}
 
 	asd = v4l2_async_notifier_add_fwnode_subdev(&vin->group->notifier,
-						    fwnode, sizeof(*asd));
+						    fwnode,
+						    struct v4l2_async_subdev);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
 		goto out;
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index 945d2eb87233..e06cd512aba2 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -910,7 +910,7 @@ static int rcsi2_parse_dt(struct rcar_csi2 *priv)
 	priv->notifier.ops = &rcar_csi2_notify_ops;
 
 	asd = v4l2_async_notifier_add_fwnode_subdev(&priv->notifier, fwnode,
-						    sizeof(*asd));
+						    struct v4l2_async_subdev);
 	fwnode_handle_put(fwnode);
 	if (IS_ERR(asd))
 		return PTR_ERR(asd);
diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
index f318cd4b8086..83bd9a412a56 100644
--- a/drivers/media/platform/rcar_drif.c
+++ b/drivers/media/platform/rcar_drif.c
@@ -1231,7 +1231,7 @@ static int rcar_drif_parse_subdevs(struct rcar_drif_sdr *sdr)
 	}
 
 	asd = v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode,
-						    sizeof(*asd));
+						    struct v4l2_async_subdev);
 	fwnode_handle_put(fwnode);
 	if (IS_ERR(asd))
 		return PTR_ERR(asd);
diff --git a/drivers/media/platform/renesas-ceu.c b/drivers/media/platform/renesas-ceu.c
index 0298d08b39e4..1678175c49bd 100644
--- a/drivers/media/platform/renesas-ceu.c
+++ b/drivers/media/platform/renesas-ceu.c
@@ -1495,7 +1495,6 @@ static int ceu_parse_platform_data(struct ceu_device *ceudev,
 				   const struct ceu_platform_data *pdata)
 {
 	const struct ceu_async_subdev *async_sd;
-	struct v4l2_async_subdev *asd;
 	struct ceu_subdev *ceu_sd;
 	unsigned int i;
 	int ret;
@@ -1511,15 +1510,14 @@ static int ceu_parse_platform_data(struct ceu_device *ceudev,
 
 		/* Setup the ceu subdevice and the async subdevice. */
 		async_sd = &pdata->subdevs[i];
-		asd = v4l2_async_notifier_add_i2c_subdev(&ceudev->notifier,
+		ceu_sd = v4l2_async_notifier_add_i2c_subdev(&ceudev->notifier,
 				async_sd->i2c_adapter_id,
 				async_sd->i2c_address,
-				sizeof(*ceu_sd));
-		if (IS_ERR(asd)) {
+				struct ceu_subdev);
+		if (IS_ERR(ceu_sd)) {
 			v4l2_async_notifier_cleanup(&ceudev->notifier);
-			return PTR_ERR(asd);
+			return PTR_ERR(ceu_sd);
 		}
-		ceu_sd = to_ceu_subdev(asd);
 		ceu_sd->mbus_flags = async_sd->flags;
 		ceudev->subdevs[i] = ceu_sd;
 	}
@@ -1534,7 +1532,6 @@ static int ceu_parse_dt(struct ceu_device *ceudev)
 {
 	struct device_node *of = ceudev->dev->of_node;
 	struct device_node *ep;
-	struct v4l2_async_subdev *asd;
 	struct ceu_subdev *ceu_sd;
 	unsigned int i;
 	int num_ep;
@@ -1576,14 +1573,13 @@ static int ceu_parse_dt(struct ceu_device *ceudev)
 		}
 
 		/* Setup the ceu subdevice and the async subdevice. */
-		asd = v4l2_async_notifier_add_fwnode_remote_subdev(
+		ceu_sd = v4l2_async_notifier_add_fwnode_remote_subdev(
 				&ceudev->notifier, of_fwnode_handle(ep),
-				sizeof(*ceu_sd));
-		if (IS_ERR(asd)) {
-			ret = PTR_ERR(asd);
+				struct ceu_subdev);
+		if (IS_ERR(ceu_sd)) {
+			ret = PTR_ERR(ceu_sd);
 			goto error_cleanup;
 		}
-		ceu_sd = to_ceu_subdev(asd);
 		ceu_sd->mbus_flags = fw_ep.bus.parallel.flags;
 		ceudev->subdevs[i] = ceu_sd;
 
diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
index daa1b6d22436..02cde70a9d74 100644
--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
@@ -251,8 +251,7 @@ static int rkisp1_subdev_notifier(struct rkisp1_device *rkisp1)
 		struct v4l2_fwnode_endpoint vep = {
 			.bus_type = V4L2_MBUS_CSI2_DPHY
 		};
-		struct rkisp1_sensor_async *rk_asd = NULL;
-		struct v4l2_async_subdev *asd;
+		struct rkisp1_sensor_async *rk_asd;
 		struct fwnode_handle *ep;
 
 		ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(rkisp1->dev),
@@ -265,14 +264,13 @@ static int rkisp1_subdev_notifier(struct rkisp1_device *rkisp1)
 		if (ret)
 			goto err_parse;
 
-		asd = v4l2_async_notifier_add_fwnode_remote_subdev(ntf, ep,
-							sizeof(*rk_asd));
-		if (IS_ERR(asd)) {
-			ret = PTR_ERR(asd);
+		rk_asd = v4l2_async_notifier_add_fwnode_remote_subdev(ntf, ep,
+							struct rkisp1_sensor_async);
+		if (IS_ERR(rk_asd)) {
+			ret = PTR_ERR(rk_asd);
 			goto err_parse;
 		}
 
-		rk_asd = container_of(asd, struct rkisp1_sensor_async, asd);
 		rk_asd->mbus_type = vep.bus_type;
 		rk_asd->mbus_flags = vep.bus.mipi_csi2.flags;
 		rk_asd->lanes = vep.bus.mipi_csi2.num_data_lanes;
diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 142f63d07dcd..bbcc2254fa2e 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -1820,7 +1820,8 @@ static int dcmi_graph_init(struct stm32_dcmi *dcmi)
 	v4l2_async_notifier_init(&dcmi->notifier);
 
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-		&dcmi->notifier, of_fwnode_handle(ep), sizeof(*asd));
+		&dcmi->notifier, of_fwnode_handle(ep),
+		struct v4l2_async_subdev);
 
 	of_node_put(ep);
 
diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
index 3f94b8c966f3..8d40a7acba9c 100644
--- a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
+++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c
@@ -135,8 +135,8 @@ static int sun4i_csi_notifier_init(struct sun4i_csi *csi)
 
 	csi->bus = vep.bus.parallel;
 
-	asd = v4l2_async_notifier_add_fwnode_remote_subdev(&csi->notifier,
-							   ep, sizeof(*asd));
+	asd = v4l2_async_notifier_add_fwnode_remote_subdev(&csi->notifier, ep,
+							   struct v4l2_async_subdev);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
 		goto out;
diff --git a/drivers/media/platform/ti-vpe/cal.c b/drivers/media/platform/ti-vpe/cal.c
index 5fb627811c6b..fa0931788040 100644
--- a/drivers/media/platform/ti-vpe/cal.c
+++ b/drivers/media/platform/ti-vpe/cal.c
@@ -685,23 +685,21 @@ static int cal_async_notifier_register(struct cal_dev *cal)
 	for (i = 0; i < cal->data->num_csi2_phy; ++i) {
 		struct cal_camerarx *phy = cal->phy[i];
 		struct cal_v4l2_async_subdev *casd;
-		struct v4l2_async_subdev *asd;
 		struct fwnode_handle *fwnode;
 
 		if (!phy->sensor_node)
 			continue;
 
 		fwnode = of_fwnode_handle(phy->sensor_node);
-		asd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier,
-							    fwnode,
-							    sizeof(*casd));
-		if (IS_ERR(asd)) {
+		casd = v4l2_async_notifier_add_fwnode_subdev(&cal->notifier,
+							     fwnode,
+							     struct cal_v4l2_async_subdev);
+		if (IS_ERR(casd)) {
 			phy_err(phy, "Failed to add subdev to notifier\n");
-			ret = PTR_ERR(asd);
+			ret = PTR_ERR(casd);
 			goto error;
 		}
 
-		casd = to_cal_asd(asd);
 		casd->phy = phy;
 	}
 
diff --git a/drivers/media/platform/video-mux.c b/drivers/media/platform/video-mux.c
index 7b280dfca727..133122e38515 100644
--- a/drivers/media/platform/video-mux.c
+++ b/drivers/media/platform/video-mux.c
@@ -371,7 +371,7 @@ static int video_mux_async_register(struct video_mux *vmux,
 			continue;
 
 		asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-			&vmux->notifier, ep, sizeof(*asd));
+			&vmux->notifier, ep, struct v4l2_async_subdev);
 
 		fwnode_handle_put(ep);
 
diff --git a/drivers/media/platform/xilinx/xilinx-vipp.c b/drivers/media/platform/xilinx/xilinx-vipp.c
index cc2856efea59..bf4015d852e3 100644
--- a/drivers/media/platform/xilinx/xilinx-vipp.c
+++ b/drivers/media/platform/xilinx/xilinx-vipp.c
@@ -359,7 +359,7 @@ static int xvip_graph_parse_one(struct xvip_composite_device *xdev,
 	dev_dbg(xdev->dev, "parsing node %p\n", fwnode);
 
 	while (1) {
-		struct v4l2_async_subdev *asd;
+		struct xvip_graph_entity *xge;
 
 		ep = fwnode_graph_get_next_endpoint(fwnode, ep);
 		if (ep == NULL)
@@ -382,12 +382,12 @@ static int xvip_graph_parse_one(struct xvip_composite_device *xdev,
 			continue;
 		}
 
-		asd = v4l2_async_notifier_add_fwnode_subdev(
+		xge = v4l2_async_notifier_add_fwnode_subdev(
 			&xdev->notifier, remote,
-			sizeof(struct xvip_graph_entity));
+			struct xvip_graph_entity);
 		fwnode_handle_put(remote);
-		if (IS_ERR(asd)) {
-			ret = PTR_ERR(asd);
+		if (IS_ERR(xge)) {
+			ret = PTR_ERR(xge);
 			goto err_notifier_cleanup;
 		}
 	}
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index d848db962dc7..e638aa8aecb7 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -631,9 +631,9 @@ unlock:
 EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_subdev);
 
 struct v4l2_async_subdev *
-v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
-				      struct fwnode_handle *fwnode,
-				      unsigned int asd_struct_size)
+__v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
+					struct fwnode_handle *fwnode,
+					unsigned int asd_struct_size)
 {
 	struct v4l2_async_subdev *asd;
 	int ret;
@@ -654,12 +654,12 @@ v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
 
 	return asd;
 }
-EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_fwnode_subdev);
+EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_fwnode_subdev);
 
 struct v4l2_async_subdev *
-v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
-					     struct fwnode_handle *endpoint,
-					     unsigned int asd_struct_size)
+__v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
+					       struct fwnode_handle *endpoint,
+					       unsigned int asd_struct_size)
 {
 	struct v4l2_async_subdev *asd;
 	struct fwnode_handle *remote;
@@ -668,21 +668,21 @@ v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
 	if (!remote)
 		return ERR_PTR(-ENOTCONN);
 
-	asd = v4l2_async_notifier_add_fwnode_subdev(notif, remote,
-						    asd_struct_size);
+	asd = __v4l2_async_notifier_add_fwnode_subdev(notif, remote,
+						      asd_struct_size);
 	/*
-	 * Calling v4l2_async_notifier_add_fwnode_subdev grabs a refcount,
+	 * Calling __v4l2_async_notifier_add_fwnode_subdev grabs a refcount,
 	 * so drop the one we got in fwnode_graph_get_remote_port_parent.
 	 */
 	fwnode_handle_put(remote);
 	return asd;
 }
-EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_fwnode_remote_subdev);
+EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_fwnode_remote_subdev);
 
 struct v4l2_async_subdev *
-v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
-				   int adapter_id, unsigned short address,
-				   unsigned int asd_struct_size)
+__v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
+				     int adapter_id, unsigned short address,
+				     unsigned int asd_struct_size)
 {
 	struct v4l2_async_subdev *asd;
 	int ret;
@@ -703,7 +703,7 @@ v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
 
 	return asd;
 }
-EXPORT_SYMBOL_GPL(v4l2_async_notifier_add_i2c_subdev);
+EXPORT_SYMBOL_GPL(__v4l2_async_notifier_add_i2c_subdev);
 
 int v4l2_async_register_subdev(struct v4l2_subdev *sd)
 {
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index 63be16c8eb83..2283ff3b8e1d 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -944,7 +944,7 @@ static int v4l2_fwnode_reference_parse(struct device *dev,
 
 		asd = v4l2_async_notifier_add_fwnode_subdev(notifier,
 							    args.fwnode,
-							    sizeof(*asd));
+							    struct v4l2_async_subdev);
 		fwnode_handle_put(args.fwnode);
 		if (IS_ERR(asd)) {
 			/* not an error if asd already exists */
@@ -1244,7 +1244,7 @@ v4l2_fwnode_reference_parse_int_props(struct device *dev,
 		struct v4l2_async_subdev *asd;
 
 		asd = v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode,
-							    sizeof(*asd));
+							    struct v4l2_async_subdev);
 		fwnode_handle_put(fwnode);
 		if (IS_ERR(asd)) {
 			ret = PTR_ERR(asd);
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 6344389e6afa..ef5add079774 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1923,7 +1923,7 @@ static int imx_csi_async_register(struct csi_priv *priv)
 					     FWNODE_GRAPH_ENDPOINT_NEXT);
 	if (ep) {
 		asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-			&priv->notifier, ep, sizeof(*asd));
+			&priv->notifier, ep, struct v4l2_async_subdev);
 
 		fwnode_handle_put(ep);
 
diff --git a/drivers/staging/media/imx/imx-media-of.c b/drivers/staging/media/imx/imx-media-of.c
index 82e13e972e23..b677cf0e0c84 100644
--- a/drivers/staging/media/imx/imx-media-of.c
+++ b/drivers/staging/media/imx/imx-media-of.c
@@ -31,7 +31,7 @@ int imx_media_of_add_csi(struct imx_media_dev *imxmd,
 	/* add CSI fwnode to async notifier */
 	asd = v4l2_async_notifier_add_fwnode_subdev(&imxmd->notifier,
 						    of_fwnode_handle(csi_np),
-						    sizeof(*asd));
+						    struct v4l2_async_subdev);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
 		if (ret == -EEXIST)
diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index a79ab38158e2..4f8fcc91aaae 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -662,7 +662,7 @@ static int csi2_async_register(struct csi2_dev *csi2)
 	dev_dbg(csi2->dev, "flags: 0x%08x\n", vep.bus.mipi_csi2.flags);
 
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-		&csi2->notifier, ep, sizeof(*asd));
+		&csi2->notifier, ep, struct v4l2_async_subdev);
 	fwnode_handle_put(ep);
 
 	if (IS_ERR(asd))
diff --git a/drivers/staging/media/imx/imx7-media-csi.c b/drivers/staging/media/imx/imx7-media-csi.c
index 6c59485291ca..3046f880c014 100644
--- a/drivers/staging/media/imx/imx7-media-csi.c
+++ b/drivers/staging/media/imx/imx7-media-csi.c
@@ -1201,7 +1201,7 @@ static int imx7_csi_async_register(struct imx7_csi *csi)
 					     FWNODE_GRAPH_ENDPOINT_NEXT);
 	if (ep) {
 		asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-			&csi->notifier, ep, sizeof(*asd));
+			&csi->notifier, ep, struct v4l2_async_subdev);
 
 		fwnode_handle_put(ep);
 
diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index 1ba77e629e5b..a01a7364b4b9 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -1025,7 +1025,7 @@ static int mipi_csis_async_register(struct csi_state *state)
 	dev_dbg(state->dev, "flags: 0x%08x\n", state->bus.flags);
 
 	asd = v4l2_async_notifier_add_fwnode_remote_subdev(
-		&state->notifier, ep, sizeof(*asd));
+		&state->notifier, ep, struct v4l2_async_subdev);
 	if (IS_ERR(asd)) {
 		ret = PTR_ERR(asd);
 		goto err_parse;
diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
index 70e1e18644b2..7a09061cda57 100644
--- a/drivers/staging/media/tegra-video/vi.c
+++ b/drivers/staging/media/tegra-video/vi.c
@@ -1788,7 +1788,7 @@ static int tegra_vi_graph_parse_one(struct tegra_vi_channel *chan,
 	struct tegra_vi *vi = chan->vi;
 	struct fwnode_handle *ep = NULL;
 	struct fwnode_handle *remote = NULL;
-	struct v4l2_async_subdev *asd;
+	struct tegra_vi_graph_entity *tvge;
 	struct device_node *node = NULL;
 	int ret;
 
@@ -1812,10 +1812,10 @@ static int tegra_vi_graph_parse_one(struct tegra_vi_channel *chan,
 			continue;
 		}
 
-		asd = v4l2_async_notifier_add_fwnode_subdev(&chan->notifier,
-				remote, sizeof(struct tegra_vi_graph_entity));
-		if (IS_ERR(asd)) {
-			ret = PTR_ERR(asd);
+		tvge = v4l2_async_notifier_add_fwnode_subdev(&chan->notifier,
+				remote, struct tegra_vi_graph_entity);
+		if (IS_ERR(tvge)) {
+			ret = PTR_ERR(tvge);
 			dev_err(vi->dev,
 				"failed to add subdev to notifier: %d\n", ret);
 			fwnode_handle_put(remote);
diff --git a/include/media/v4l2-async.h b/include/media/v4l2-async.h
index b113329582ff..192a11bdc4ad 100644
--- a/include/media/v4l2-async.h
+++ b/include/media/v4l2-async.h
@@ -168,9 +168,12 @@ int __v4l2_async_notifier_add_subdev(struct v4l2_async_notifier *notifier,
  * is released later at notifier cleanup time.
  */
 struct v4l2_async_subdev *
-v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
-				      struct fwnode_handle *fwnode,
-				      unsigned int asd_struct_size);
+__v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
+					struct fwnode_handle *fwnode,
+					unsigned int asd_struct_size);
+#define v4l2_async_notifier_add_fwnode_subdev(__notifier, __fwnode, __type)	\
+((__type *)__v4l2_async_notifier_add_fwnode_subdev(__notifier, __fwnode,	\
+						   sizeof(__type)))
 
 /**
  * v4l2_async_notifier_add_fwnode_remote_subdev - Allocate and add a fwnode
@@ -194,9 +197,12 @@ v4l2_async_notifier_add_fwnode_subdev(struct v4l2_async_notifier *notifier,
  * exception that the fwnode refers to a local endpoint, not the remote one.
  */
 struct v4l2_async_subdev *
-v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
-					     struct fwnode_handle *endpoint,
-					     unsigned int asd_struct_size);
+__v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
+					       struct fwnode_handle *endpoint,
+					       unsigned int asd_struct_size);
+#define v4l2_async_notifier_add_fwnode_remote_subdev(__notifier, __ep, __type)	\
+((__type *)__v4l2_async_notifier_add_fwnode_remote_subdev(__notifier, __ep,	\
+							  sizeof(__type)))
 
 /**
  * v4l2_async_notifier_add_i2c_subdev - Allocate and add an i2c async
@@ -214,9 +220,12 @@ v4l2_async_notifier_add_fwnode_remote_subdev(struct v4l2_async_notifier *notif,
  * Same as above but for I2C matched sub-devices.
  */
 struct v4l2_async_subdev *
-v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
-				   int adapter_id, unsigned short address,
-				   unsigned int asd_struct_size);
+__v4l2_async_notifier_add_i2c_subdev(struct v4l2_async_notifier *notifier,
+				     int adapter_id, unsigned short address,
+				     unsigned int asd_struct_size);
+#define v4l2_async_notifier_add_i2c_subdev(__notifier, __adap, __addr, __type)	\
+((__type *)__v4l2_async_notifier_add_i2c_subdev(__notifier, __adap, __addr,	\
+						sizeof(__type)))
 
 /**
  * v4l2_async_notifier_register - registers a subdevice asynchronous notifier