linux-kernel - [PATCH v9 3/4] usb: gadget: uvc: move video disable logic to its own function

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Date:   Fri, 27 Oct 2023 13:19:58 -0700
From:   Avichal Rakesh <arakesh@...gle.com>
To:     arakesh@...gle.com, dan.scally@...asonboard.com
Cc:     etalvala@...gle.com, gregkh@...uxfoundation.org,
        jchowdhary@...gle.com, laurent.pinchart@...asonboard.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        m.grzeschik@...gutronix.de
Subject: [PATCH v9 3/4] 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@...asonboard.com>
Suggested-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
Signed-off-by: Avichal Rakesh <arakesh@...gle.com>
---
v6: Introduced this patch to make the next one easier to review
v6 -> v7: Add Suggested-by
v7 -> v8: No change. Getting back in review queue
v8 -> v9: Call uvcg_video_disable directly instead of uvcg_video_enable(video, 0)

 drivers/usb/gadget/function/uvc_v4l2.c  |  6 ++--
 drivers/usb/gadget/function/uvc_video.c | 40 ++++++++++++++++---------
 drivers/usb/gadget/function/uvc_video.h |  3 +-
 3 files changed, 31 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c
index 7cb8d027ff0c..904dd283cbf7 100644
--- a/drivers/usb/gadget/function/uvc_v4l2.c
+++ b/drivers/usb/gadget/function/uvc_v4l2.c
@@ -443,7 +443,7 @@ 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;

@@ -469,7 +469,7 @@ 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;

@@ -515,7 +515,7 @@ 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);
diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index f8f9209fee50..1081dd790fd6 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -494,31 +494,43 @@ 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)
diff --git a/drivers/usb/gadget/function/uvc_video.h b/drivers/usb/gadget/function/uvc_video.h
index 03adeefa343b..8ef6259741f1 100644
--- a/drivers/usb/gadget/function/uvc_video.h
+++ b/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);

--
2.42.0.820.g83a721a137-goog