FROMGIT: usb: gadget: uvc: move video disable logic to its own function

This patch refactors the video disable logic in uvcg_video_enable
into its own separate function 'uvcg_video_disable'. This function
is now used anywhere uvcg_video_enable(video, 0) was used.

Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Suggested-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Avichal Rakesh <arakesh@google.com>
Link: https://lore.kernel.org/r/20231109004104.3467968-3-arakesh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 296925310
(cherry picked from commit 2079b60bda3257146a4e8ed7525513865f7e6b3e
 https://kernel.googlesource.com/pub/scm/linux/kernel/git/gregkh/usb usb-next)
Change-Id: Ie8934e6fe1577373b01e3c66626e4239cf9f8c83
Signed-off-by: Avichal Rakesh <arakesh@google.com>

drivers/usb/gadget/function/uvc_v4l2.c

@@ -449,7 +449,7 @@ uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 		return -EINVAL;
 
 	/* Enable UVC video. */
-	ret = uvcg_video_enable(video, 1);
+	ret = uvcg_video_enable(video);
 	if (ret < 0)
 		return ret;
 
@@ -475,7 +475,7 @@ uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 		return -EINVAL;
 
 	uvc->state = UVC_STATE_CONNECTED;
-	ret = uvcg_video_enable(video, 0);
+	ret = uvcg_video_disable(video);
 	if (ret < 0)
 		return ret;
 
@@ -521,7 +521,7 @@ static void uvc_v4l2_disable(struct uvc_device *uvc)
 	if (uvc->state == UVC_STATE_STREAMING)
 		uvc->state = UVC_STATE_CONNECTED;
 
-	uvcg_video_enable(&uvc->video, 0);
+	uvcg_video_disable(&uvc->video);
 	uvcg_free_buffers(&uvc->video.queue);
 	uvc->func_connected = false;
 	wake_up_interruptible(&uvc->func_connected_queue);

drivers/usb/gadget/function/uvc_video.c

@@ -493,31 +493,43 @@ static void uvcg_video_pump(struct work_struct *work)
 }
 
 /*
- * Enable or disable the video stream.
+ * Disable the video stream
  */
-int uvcg_video_enable(struct uvc_video *video, int enable)
+int
+uvcg_video_disable(struct uvc_video *video)
 {
-	int ret;
 	struct uvc_request *ureq;
 
 	if (video->ep == NULL) {
 		uvcg_info(&video->uvc->func,
-			  "Video enable failed, device is uninitialized.\n");
+			  "Video disable failed, device is uninitialized.\n");
 		return -ENODEV;
 	}
 
-	if (!enable) {
-		cancel_work_sync(&video->pump);
-		uvcg_queue_cancel(&video->queue, 0);
+	cancel_work_sync(&video->pump);
+	uvcg_queue_cancel(&video->queue, 0);
 
-		list_for_each_entry(ureq, &video->ureqs, list) {
-			if (ureq->req)
-				usb_ep_dequeue(video->ep, ureq->req);
-		}
+	list_for_each_entry(ureq, &video->ureqs, list) {
+		if (ureq->req)
+			usb_ep_dequeue(video->ep, ureq->req);
+	}
 
-		uvc_video_free_requests(video);
-		uvcg_queue_enable(&video->queue, 0);
-		return 0;
+	uvc_video_free_requests(video);
+	uvcg_queue_enable(&video->queue, 0);
+	return 0;
+}
+
+/*
+ * Enable the video stream.
+ */
+int uvcg_video_enable(struct uvc_video *video)
+{
+	int ret;
+
+	if (video->ep == NULL) {
+		uvcg_info(&video->uvc->func,
+			  "Video enable failed, device is uninitialized.\n");
+		return -ENODEV;
 	}
 
 	if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0)

drivers/usb/gadget/function/uvc_video.h

@@ -14,7 +14,8 @@
 
 struct uvc_video;
 
-int uvcg_video_enable(struct uvc_video *video, int enable);
+int uvcg_video_enable(struct uvc_video *video);
+int uvcg_video_disable(struct uvc_video *video);
 
 int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc);