media: bttv: radio use v4l2_fh instead of bttv_fh

Use a v4l2_fh when opening a radio device instead of a bttv_fh and manage
it with v4l2_fh_open() and v4l2_fh_release() and v4l2_ctrl_poll(). This
eliminates bttv_fh from the radio in preparation for vb2 conversion which
stops using separate bttv file handles altogether.
Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/pci/bt8xx/bttv-driver.c

@@ -2740,45 +2740,34 @@ static int radio_open(struct file *file)
 {
 	struct video_device *vdev = video_devdata(file);
 	struct bttv *btv = video_drvdata(file);
-	struct bttv_fh *fh;
+	int ret = v4l2_fh_open(file);
 
-	dprintk("open dev=%s\n", video_device_node_name(vdev));
+	if (ret)
+		return ret;
 
+	dprintk("open dev=%s\n", video_device_node_name(vdev));
 	dprintk("%d: open called (radio)\n", btv->c.nr);
 
-	/* allocate per filehandle data */
-	fh = kmalloc(sizeof(*fh), GFP_KERNEL);
-	if (unlikely(!fh))
-		return -ENOMEM;
-	file->private_data = fh;
-	*fh = btv->init;
-	v4l2_fh_init(&fh->fh, vdev);
-
 	btv->radio_user++;
 	audio_mute(btv, btv->mute);
 
-	v4l2_fh_add(&fh->fh);
-
 	return 0;
 }
 
 static int radio_release(struct file *file)
 {
-	struct bttv_fh *fh = file->private_data;
 	struct bttv *btv = video_drvdata(file);
 	struct saa6588_command cmd;
 
-	file->private_data = NULL;
-	v4l2_fh_del(&fh->fh);
-	v4l2_fh_exit(&fh->fh);
-	kfree(fh);
-
 	btv->radio_user--;
 
 	bttv_call_all(btv, core, command, SAA6588_CMD_CLOSE, &cmd);
 
 	if (btv->radio_user == 0)
 		btv->has_radio_tuner = 0;
+
+	v4l2_fh_release(file);
+
 	return 0;
 }
 
@@ -2858,23 +2847,17 @@ static ssize_t radio_read(struct file *file, char __user *data,
 
 static __poll_t radio_poll(struct file *file, poll_table *wait)
 {
-	struct bttv_fh *fh = file->private_data;
 	struct bttv *btv = video_drvdata(file);
-	__poll_t req_events = poll_requested_events(wait);
 	struct saa6588_command cmd;
-	__poll_t res = 0;
+	__poll_t rc = v4l2_ctrl_poll(file, wait);
 
-	if (v4l2_event_pending(&fh->fh))
-		res = EPOLLPRI;
-	else if (req_events & EPOLLPRI)
-		poll_wait(file, &fh->fh.wait, wait);
 	radio_enable(btv);
 	cmd.instance = file;
 	cmd.event_list = wait;
-	cmd.poll_mask = res;
+	cmd.poll_mask = 0;
 	bttv_call_all(btv, core, command, SAA6588_CMD_POLL, &cmd);
 
-	return cmd.poll_mask;
+	return rc | cmd.poll_mask;
 }
 
 static const struct v4l2_file_operations radio_fops =