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usb: gadget: uvc: increase worker prio to WQ_HIGHPRI
This patch is changing the simple workqueue in the gadget driver to be allocated as async_wq with a higher priority. The pump worker, that is filling the usb requests, will have a higher priority and will not be scheduled away so often while the video stream is handled. This will lead to fewer streaming underruns. Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Link: https://lore.kernel.org/r/20220907215818.2670097-1-m.grzeschik@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -897,10 +897,14 @@ static void uvc_function_unbind(struct usb_configuration *c,
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct uvc_device *uvc = to_uvc(f);
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struct uvc_video *video = &uvc->video;
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long wait_ret = 1;
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uvcg_info(f, "%s()\n", __func__);
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if (video->async_wq)
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destroy_workqueue(video->async_wq);
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/*
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* If we know we're connected via v4l2, then there should be a cleanup
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* of the device from userspace either via UVC_EVENT_DISCONNECT or
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@ -88,6 +88,7 @@ struct uvc_video {
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struct usb_ep *ep;
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struct work_struct pump;
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struct workqueue_struct *async_wq;
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/* Frame parameters */
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u8 bpp;
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@ -170,7 +170,7 @@ uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
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return ret;
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if (uvc->state == UVC_STATE_STREAMING)
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schedule_work(&video->pump);
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queue_work(video->async_wq, &video->pump);
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return ret;
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}
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@ -277,7 +277,7 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
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spin_unlock_irqrestore(&video->req_lock, flags);
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if (uvc->state == UVC_STATE_STREAMING)
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schedule_work(&video->pump);
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queue_work(video->async_wq, &video->pump);
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}
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static int
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@ -485,7 +485,7 @@ int uvcg_video_enable(struct uvc_video *video, int enable)
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video->req_int_count = 0;
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schedule_work(&video->pump);
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queue_work(video->async_wq, &video->pump);
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return ret;
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}
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@ -499,6 +499,11 @@ int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc)
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spin_lock_init(&video->req_lock);
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INIT_WORK(&video->pump, uvcg_video_pump);
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/* Allocate a work queue for asynchronous video pump handler. */
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video->async_wq = alloc_workqueue("uvcgadget", WQ_UNBOUND | WQ_HIGHPRI, 0);
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if (!video->async_wq)
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return -EINVAL;
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video->uvc = uvc;
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video->fcc = V4L2_PIX_FMT_YUYV;
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video->bpp = 16;
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