From 5fc49d8bee73648a706f5892663f5bd728ab07ea Mon Sep 17 00:00:00 2001
From: Michael Grzeschik <m.grzeschik@pengutronix.de>
Date: Sun, 17 Oct 2021 23:50:15 +0200
Subject: [PATCH] usb: gadget: uvc: only schedule stream in streaming state
Git-commit: 5fc49d8bee73648a706f5892663f5bd728ab07ea
References: git-fixes
Patch-mainline: v5.16-rc1

This patch ensures that the video pump thread will only be scheduled if
the uvc is really in streaming state. This way the worker will not have
to run on an empty queue.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20211017215017.18392-5-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 drivers/usb/gadget/function/uvc_v4l2.c  | 3 ++-
 drivers/usb/gadget/function/uvc_video.c | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c
index 197c26f7aec6..a2c78690c5c2 100644
--- a/drivers/usb/gadget/function/uvc_v4l2.c
+++ b/drivers/usb/gadget/function/uvc_v4l2.c
@@ -169,7 +169,8 @@ uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 	if (ret < 0)
 		return ret;
 
-	schedule_work(&video->pump);
+	if (uvc->state == UVC_STATE_STREAMING)
+		schedule_work(&video->pump);
 
 	return ret;
 }
diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index 4222192fa624..167145687af4 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -216,6 +216,7 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
 	struct uvc_request *ureq = req->context;
 	struct uvc_video *video = ureq->video;
 	struct uvc_video_queue *queue = &video->queue;
+	struct uvc_device *uvc = video->uvc;
 	unsigned long flags;
 
 	switch (req->status) {
@@ -238,7 +239,8 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
 	list_add_tail(&req->list, &video->req_free);
 	spin_unlock_irqrestore(&video->req_lock, flags);
 
-	schedule_work(&video->pump);
+	if (uvc->state == UVC_STATE_STREAMING)
+		schedule_work(&video->pump);
 }
 
 static int
-- 
2.39.0