media: uvcvideo: Remove stream->is_streaming field

The is_streaming field is used by modular PM to know if the device is
currently streaming or not.

With the transition to vb2 and fop helpers, we can use vb2 functions for
the same functionality. The great benefit is that vb2 already tracks the
streaming state for us.

Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Ricardo Ribalda <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Hans Verkuil <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

Author: ribalda

drivers/media/usb/uvc/uvc_queue.c

@@ -175,12 +175,18 @@ static int uvc_start_streaming_video(struct vb2_queue *vq, unsigned int count)
 
 	lockdep_assert_irqs_enabled();
 
+	ret = uvc_pm_get(stream->dev);
+	if (ret)
+		return ret;
+
 	queue->buf_used = 0;
 
 	ret = uvc_video_start_streaming(stream);
 	if (ret == 0)
 		return 0;
 
+	uvc_pm_put(stream->dev);
+
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED);
 
 	return ret;
@@ -189,11 +195,14 @@ static int uvc_start_streaming_video(struct vb2_queue *vq, unsigned int count)
 static void uvc_stop_streaming_video(struct vb2_queue *vq)
 {
 	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
+	struct uvc_streaming *stream = uvc_queue_to_stream(queue);
 
 	lockdep_assert_irqs_enabled();
 
 	uvc_video_stop_streaming(uvc_queue_to_stream(queue));
 
+	uvc_pm_put(stream->dev);
+
 	uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
 }
 

drivers/media/usb/uvc/uvc_v4l2.c

@@ -617,9 +617,6 @@ static int uvc_v4l2_release(struct file *file)
 
 	uvc_ctrl_cleanup_fh(handle);
 
-	if (handle->is_streaming)
-		uvc_pm_put(stream->dev);
-
 	/* Release the file handle. */
 	vb2_fop_release(file);
 
@@ -676,50 +673,6 @@ static int uvc_ioctl_try_fmt(struct file *file, void *fh,
 	return uvc_v4l2_try_format(stream, fmt, &probe, NULL, NULL);
 }
 
-static int uvc_ioctl_streamon(struct file *file, void *fh,
-			      enum v4l2_buf_type type)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	if (handle->is_streaming)
-		return 0;
-
-	ret = uvc_pm_get(stream->dev);
-	if (ret)
-		return ret;
-
-	ret = vb2_ioctl_streamon(file, fh, type);
-	if (ret) {
-		uvc_pm_put(stream->dev);
-		return ret;
-	}
-
-	handle->is_streaming = true;
-
-	return 0;
-}
-
-static int uvc_ioctl_streamoff(struct file *file, void *fh,
-			       enum v4l2_buf_type type)
-{
-	struct uvc_fh *handle = fh;
-	struct uvc_streaming *stream = handle->stream;
-	int ret;
-
-	ret = vb2_ioctl_streamoff(file, fh, type);
-	if (ret)
-		return ret;
-
-	if (handle->is_streaming) {
-		handle->is_streaming = false;
-		uvc_pm_put(stream->dev);
-	}
-
-	return 0;
-}
-
 static int uvc_ioctl_enum_input(struct file *file, void *fh,
 				struct v4l2_input *input)
 {
@@ -1320,8 +1273,8 @@ const struct v4l2_ioctl_ops uvc_ioctl_ops = {
 	.vidioc_expbuf = vb2_ioctl_expbuf,
 	.vidioc_dqbuf = vb2_ioctl_dqbuf,
 	.vidioc_create_bufs = vb2_ioctl_create_bufs,
-	.vidioc_streamon = uvc_ioctl_streamon,
-	.vidioc_streamoff = uvc_ioctl_streamoff,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
 	.vidioc_enum_input = uvc_ioctl_enum_input,
 	.vidioc_g_input = uvc_ioctl_g_input,
 	.vidioc_s_input = uvc_ioctl_s_input,

drivers/media/usb/uvc/uvcvideo.h

@@ -629,7 +629,6 @@ struct uvc_fh {
 	struct uvc_video_chain *chain;
 	struct uvc_streaming *stream;
 	unsigned int pending_async_ctrls;
-	bool is_streaming;
 };
 
 /* ------------------------------------------------------------------------