media: v4l: async: Try more connections

When an async sub-device is registered, it used to be that the first one
of its connections were matched when found. Continue looking for matches
until a notifier no longer has any.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de> # imx6qp
Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> # rcar + adv746x
Tested-by: Aishwarya Kothari <aishwarya.kothari@toradex.com> # Apalis i.MX6Q with TC358743
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/v4l2-core/v4l2-async.c

@@ -789,6 +789,7 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
 		if (!v4l2_dev)
 			continue;
 
+again:
 		asc = v4l2_async_find_match(notifier, sd);
 		if (!asc)
 			continue;
@@ -801,13 +802,12 @@ int v4l2_async_register_subdev(struct v4l2_subdev *sd)
 		if (ret)
 			goto err_unbind;
 
-		goto out_unlock;
+		goto again;
 	}
 
 	/* None matched, wait for hot-plugging */
 	list_add(&sd->async_list, &subdev_list);
 
-out_unlock:
 	mutex_unlock(&list_lock);
 
 	return 0;