media: staging/imx: convert static vdev lists to list_head

Although not technically necessary because imx-media has only a
maximum of 8 video devices, and once setup the video device lists
are static, in anticipation of moving control ineritance to
v4l2-core, make the vdev lists more generic by converting to
dynamic list_head's.

After doing that, 'struct imx_media_pad' is now just a list_head
of video devices reachable from a pad. Allocate an array of list_head's,
one list_head for each pad, and attach that array to sd->host_priv.
An entry in the pad lists is of type 'struct imx_media_pad_vdev', and
points to a video device from the master list.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index 7b6763802db8..576bdc7e9c42 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -748,6 +748,8 @@ imx_media_capture_device_init(struct v4l2_subdev *src_sd, int pad)
 	vfd->queue = &priv->q;
 	priv->vdev.vfd = vfd;
 
+	INIT_LIST_HEAD(&priv->vdev.list);
+
 	video_set_drvdata(vfd, priv);
 
 	v4l2_ctrl_handler_init(&priv->ctrl_hdlr, 0);