Patch fa5034c6 added a name to a union part of struct media_entity.
We can use the same values in older kernels, we just can't access
them via the union name.

mcgrof@frijol ~/linux-next (git::master)$ git describe --contains fa5034c6
v3.3-rc1~48^2~416

commit fa5034c667c224be48db31a0d043dba305e8e7a8
Author: Clemens Ladisch <clemens@ladisch.de>
Date:   Sat Nov 5 18:42:01 2011 -0300

    [media] media: fix truncated entity specification
    
    When enumerating an entity, assign the entire entity specification
    instead of only the first two words. (This requires giving the
    specification union a name.)
    
    So far, no driver actually uses more than two words, but this will
    be needed for ALSA entities.
    
    Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
    [laurent.pinchart@ideasonboard.com: Rename specification to info]
    Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
    Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

--- a/drivers/media/v4l2-core/v4l2-dev.c
+++ b/drivers/media/v4l2-core/v4l2-dev.c
@@ -924,8 +924,13 @@ int __video_register_device(struct video
 	    vdev->vfl_type != VFL_TYPE_SUBDEV) {
 		vdev->entity.type = MEDIA_ENT_T_DEVNODE_V4L;
 		vdev->entity.name = vdev->name;
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
 		vdev->entity.info.v4l.major = VIDEO_MAJOR;
 		vdev->entity.info.v4l.minor = vdev->minor;
+#else
+		vdev->entity.v4l.major = VIDEO_MAJOR;
+		vdev->entity.v4l.minor = vdev->minor;
+#endif
 		ret = media_device_register_entity(vdev->v4l2_dev->mdev,
 			&vdev->entity);
 		if (ret < 0)
--- a/drivers/media/v4l2-core/v4l2-device.c
+++ b/drivers/media/v4l2-core/v4l2-device.c
@@ -232,8 +232,13 @@ int v4l2_device_register_subdev_nodes(st
 			goto clean_up;
 		}
 #if defined(CONFIG_MEDIA_CONTROLLER)
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
 		sd->entity.info.v4l.major = VIDEO_MAJOR;
 		sd->entity.info.v4l.minor = vdev->minor;
+#else
+		sd->entity.v4l.major = VIDEO_MAJOR;
+		sd->entity.v4l.minor = vdev->minor;
+#endif
 #endif
 		sd->devnode = vdev;
 	}