[media] au0828: enable VBI timeout when calling read() without streamon()

Because some clients (e.g. tvtime) will just open the filehandle and call
read() instead of explicitly calling streamon first, we need to make sure the
VBI timeout routine gets enabled in this case.
Signed-off-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/au0828/au0828-video.c

@@ -1116,6 +1116,13 @@ static ssize_t au0828_v4l2_read(struct file *filp, char __user *buf,
 		if (!res_get(fh, AU0828_RESOURCE_VBI))
 			return -EBUSY;
 
+		if (dev->vbi_timeout_running == 0) {
+			/* Handle case where caller tries to read without
+			   calling streamon first */
+			dev->vbi_timeout_running = 1;
+			mod_timer(&dev->vbi_timeout, jiffies + (HZ / 10));
+		}
+
 		return videobuf_read_stream(&fh->vb_vbiq, buf, count, pos, 0,
 					    filp->f_flags & O_NONBLOCK);
 	}