V4L/DVB (7599): em28xx-dvb: videobuf callbacks are waiting for em28xx_fh

Thanks to Devin Heitmueller <devin.heitmueller@gmail.com> for pointing
this issue.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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

@@ -45,6 +45,7 @@ buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
 	struct em28xx_fh *fh = vq->priv_data;
 	struct em28xx        *dev = fh->dev;
 
+	/* FIXME: The better would be to allocate a smaller buffer */
 	*size = 16 * fh->dev->width * fh->dev->height >> 3;
 	if (0 == *count)
 		*count = EM28XX_DEF_BUF;
@@ -109,11 +110,16 @@ static int dvb_init(struct em28xx *dev)
 
 	dev->qops->buf_setup = buffer_setup;
 
+	/* FIXME: Do we need more initialization here? */
+	memset(&dev->dvb_fh, 0, sizeof (dev->dvb_fh));
+	dev->dvb_fh.dev = dev;
+	dev->dvb_fh.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
 	videobuf_queue_vmalloc_init(&dev->dvb.dvbq, dev->qops,
 			&dev->udev->dev, &dev->slock,
 			V4L2_BUF_TYPE_VIDEO_CAPTURE,
 			V4L2_FIELD_ALTERNATE,
-			sizeof(struct em28xx_buffer), dev);
+			sizeof(struct em28xx_buffer), &dev->dvb_fh);
 
 	/* init frontend */
 	switch (dev->model) {

drivers/media/video/em28xx/em28xx.h

@@ -304,6 +304,18 @@ struct em28xx_audio {
 	spinlock_t slock;
 };
 
+struct em28xx;
+
+struct em28xx_fh {
+	struct em28xx *dev;
+	unsigned int  stream_on:1;	/* Locks streams */
+	int           radio;
+
+	struct videobuf_queue        vb_vidq;
+
+	enum v4l2_buf_type           type;
+};
+
 /* main device struct */
 struct em28xx {
 	/* generic device properties */
@@ -401,19 +413,10 @@ struct em28xx {
 #if defined(CONFIG_VIDEO_EM28XX_DVB) || defined(CONFIG_VIDEO_EM28XX_DVB_MODULE)
 	struct videobuf_dvb        dvb;
 	struct videobuf_queue_ops  *qops;
+	struct em28xx_fh	   dvb_fh;
 #endif
 };
 
-struct em28xx_fh {
-	struct em28xx *dev;
-	unsigned int  stream_on:1;	/* Locks streams */
-	int           radio;
-
-	struct videobuf_queue        vb_vidq;
-
-	enum v4l2_buf_type           type;
-};
-
 struct em28xx_ops {
 	struct list_head next;
 	char *name;