media: rcar_drif: Allocate v4l2_async_subdev dynamically

v4l2_async_notifier_add_subdev() requires the asd to be allocated
dynamically, but the rcar-drif driver embeds it in the
rcar_drif_graph_ep structure. This causes memory corruption when the
notifier is destroyed at remove time with v4l2_async_notifier_cleanup().

Fix this issue by registering the asd with
v4l2_async_notifier_add_fwnode_subdev(), which allocates it dynamically
internally.

Fixes: d079f94c ("media: platform: Switch to v4l2_async_notifier_add_subdev")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/rcar_drif.c

@@ -185,7 +185,6 @@ struct rcar_drif_frame_buf {
 /* OF graph endpoint's V4L2 async data */
 struct rcar_drif_graph_ep {
 	struct v4l2_subdev *subdev;	/* Async matched subdev */
-	struct v4l2_async_subdev asd;	/* Async sub-device descriptor */
 };
 
 /* DMA buffer */
@@ -1109,12 +1108,6 @@ static int rcar_drif_notify_bound(struct v4l2_async_notifier *notifier,
 	struct rcar_drif_sdr *sdr =
 		container_of(notifier, struct rcar_drif_sdr, notifier);
 
-	if (sdr->ep.asd.match.fwnode !=
-	    of_fwnode_handle(subdev->dev->of_node)) {
-		rdrif_err(sdr, "subdev %s cannot bind\n", subdev->name);
-		return -EINVAL;
-	}
-
 	v4l2_set_subdev_hostdata(subdev, sdr);
 	sdr->ep.subdev = subdev;
 	rdrif_dbg(sdr, "bound asd %s\n", subdev->name);
@@ -1218,7 +1211,7 @@ static int rcar_drif_parse_subdevs(struct rcar_drif_sdr *sdr)
 {
 	struct v4l2_async_notifier *notifier = &sdr->notifier;
 	struct fwnode_handle *fwnode, *ep;
-	int ret;
+	struct v4l2_async_subdev *asd;
 
 	v4l2_async_notifier_init(notifier);
 
@@ -1237,12 +1230,13 @@ static int rcar_drif_parse_subdevs(struct rcar_drif_sdr *sdr)
 		return -EINVAL;
 	}
 
-	sdr->ep.asd.match.fwnode = fwnode;
-	sdr->ep.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
-	ret = v4l2_async_notifier_add_subdev(notifier, &sdr->ep.asd);
+	asd = v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode,
+						    sizeof(*asd));
 	fwnode_handle_put(fwnode);
+	if (IS_ERR(asd))
+		return PTR_ERR(asd);
 
-	return ret;
+	return 0;
 }
 
 /* Check if the given device is the primary bond */