[media] em28xx: move videobuf2 related data from struct em28xx to struct v4l2

The video and VBI-specific VB2 queue and mutexes are used only by
the v4l2 sub-driver. Move them to the V4L2 struct, preventing
wasting memory if this sub-driver is not used.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/usb/em28xx/em28xx-cards.c

@@ -3016,8 +3016,6 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
 	const char *chip_name = default_chip_name;
 
 	dev->udev = udev;
-	mutex_init(&dev->vb_queue_lock);
-	mutex_init(&dev->vb_vbi_queue_lock);
 	mutex_init(&dev->ctrl_urb_lock);
 	spin_lock_init(&dev->slock);
 

drivers/media/usb/em28xx/em28xx-video.c

@@ -1045,9 +1045,10 @@ static int em28xx_vb2_setup(struct em28xx *dev)
 {
 	int rc;
 	struct vb2_queue *q;
+	struct em28xx_v4l2 *v4l2 = dev->v4l2;
 
 	/* Setup Videobuf2 for Video capture */
-	q = &dev->vb_vidq;
+	q = &v4l2->vb_vidq;
 	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
@@ -1061,7 +1062,7 @@ static int em28xx_vb2_setup(struct em28xx *dev)
 		return rc;
 
 	/* Setup Videobuf2 for VBI capture */
-	q = &dev->vb_vbiq;
+	q = &v4l2->vb_vbiq;
 	q->type = V4L2_BUF_TYPE_VBI_CAPTURE;
 	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
@@ -2479,8 +2480,10 @@ static int em28xx_v4l2_init(struct em28xx *dev)
 		ret = -ENODEV;
 		goto unregister_dev;
 	}
-	v4l2->vdev->queue = &dev->vb_vidq;
-	v4l2->vdev->queue->lock = &dev->vb_queue_lock;
+	mutex_init(&v4l2->vb_queue_lock);
+	mutex_init(&v4l2->vb_vbi_queue_lock);
+	v4l2->vdev->queue = &v4l2->vb_vidq;
+	v4l2->vdev->queue->lock = &v4l2->vb_queue_lock;
 
 	/* disable inapplicable ioctls */
 	if (dev->board.is_webcam) {
@@ -2515,8 +2518,8 @@ static int em28xx_v4l2_init(struct em28xx *dev)
 		v4l2->vbi_dev = em28xx_vdev_init(dev, &em28xx_video_template,
 						"vbi");
 
-		v4l2->vbi_dev->queue = &dev->vb_vbiq;
-		v4l2->vbi_dev->queue->lock = &dev->vb_vbi_queue_lock;
+		v4l2->vbi_dev->queue = &v4l2->vb_vbiq;
+		v4l2->vbi_dev->queue->lock = &v4l2->vb_vbi_queue_lock;
 
 		/* disable inapplicable ioctls */
 		v4l2_disable_ioctl(v4l2->vdev, VIDIOC_S_PARM);

drivers/media/usb/em28xx/em28xx.h

@@ -509,6 +509,12 @@ struct em28xx_v4l2 {
 	struct video_device *vdev;
 	struct video_device *vbi_dev;
 	struct video_device *radio_dev;
+
+	/* Videobuf2 */
+	struct vb2_queue vb_vidq;
+	struct vb2_queue vb_vbiq;
+	struct mutex vb_queue_lock;
+	struct mutex vb_vbi_queue_lock;
 };
 
 struct em28xx_audio {
@@ -650,12 +656,6 @@ struct em28xx {
 	struct mutex lock;
 	struct mutex ctrl_urb_lock;	/* protects urb_buf */
 
-	/* Videobuf2 */
-	struct vb2_queue vb_vidq;
-	struct vb2_queue vb_vbiq;
-	struct mutex vb_queue_lock;
-	struct mutex vb_vbi_queue_lock;
-
 	/* resources in use */
 	unsigned int resources;