linux-kernel - [PATCH v7 3/4] usb: gadget: uvc: move video disable logic to its own function

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Message-ID: <20231020173626.2978356-3-arakesh@google.com>
Date:   Fri, 20 Oct 2023 10:36:25 -0700
From:   Avichal Rakesh <arakesh@...gle.com>
To:     arakesh@...gle.com, dan.scally@...asonboard.com,
        laurent.pinchart@...asonboard.com
Cc:     etalvala@...gle.com, gregkh@...uxfoundation.org,
        jchowdhary@...gle.com, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, m.grzeschik@...gutronix.de
Subject: [PATCH v7 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'.

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

 drivers/usb/gadget/function/uvc_video.c | 37 +++++++++++++++----------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index c180866c8e34..80b8eaea2d39 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -493,13 +493,33 @@ static void uvcg_video_pump(struct work_struct *work)
 	return;
 }

+/*
+ * Disable video stream
+ */
+static int
+uvcg_video_disable(struct uvc_video *video)
+{
+	struct uvc_request *ureq;
+
+	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);
+	}
+
+	uvc_video_free_requests(video);
+	uvcg_queue_enable(&video->queue, 0);
+	return 0;
+}
+
 /*
  * Enable or disable the video stream.
  */
 int uvcg_video_enable(struct uvc_video *video, int enable)
 {
 	int ret;
-	struct uvc_request *ureq;

 	if (video->ep == NULL) {
 		uvcg_info(&video->uvc->func,
@@ -507,19 +527,8 @@ int uvcg_video_enable(struct uvc_video *video, int enable)
 		return -ENODEV;
 	}

-	if (!enable) {
-		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);
-		}
-
-		uvc_video_free_requests(video);
-		uvcg_queue_enable(&video->queue, 0);
-		return 0;
-	}
+	if (!enable)
+		return uvcg_video_disable(video);

 	if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0)
 		return ret;
--
2.42.0.758.gaed0368e0e-goog