[PATCH 4/7] usb: gadget: uvc: only schedule stream in streaming state
From: Michael Grzeschik <hidden>
Date: 2021-09-30 10:27:30
Subsystem:
the rest, usb subsystem, usb webcam gadget · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
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. Signed-off-by: Michael Grzeschik <redacted> --- 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 4ca89eab61590..67922b1355e69 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 cdfd3726a86ae..ccee35177411d 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c@@ -215,6 +215,7 @@ 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) {
@@ -237,7 +238,8 @@ 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
--
2.30.2