diff options
| author | Michael Grzeschik <m.grzeschik@pengutronix.de> | 2022-09-07 23:58:18 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-09 09:30:18 +0200 |
| commit | 9b91a65230784a9ef644b8bdbb82a79ba4ae9456 (patch) | |
| tree | 3eea9295f4086b0435701f94a8f72d9b36eb4160 /drivers/usb/gadget | |
| parent | d818320ea200b02f2fea693b2be204f1990bb7e9 (diff) | |
| download | linux-9b91a65230784a9ef644b8bdbb82a79ba4ae9456.tar.bz2 | |
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>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/function/f_uvc.c | 4 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/uvc.h | 1 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/uvc_v4l2.c | 2 | ||||
| -rw-r--r-- | drivers/usb/gadget/function/uvc_video.c | 9 |
4 files changed, 13 insertions, 3 deletions
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index f4f6cf75930b..09961f4ca981 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -897,10 +897,14 @@ static void uvc_function_unbind(struct usb_configuration *c, { struct usb_composite_dev *cdev = c->cdev; struct uvc_device *uvc = to_uvc(f); + struct uvc_video *video = &uvc->video; long wait_ret = 1; uvcg_info(f, "%s()\n", __func__); + if (video->async_wq) + destroy_workqueue(video->async_wq); + /* * If we know we're connected via v4l2, then there should be a cleanup * of the device from userspace either via UVC_EVENT_DISCONNECT or diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h index 58e383afdd44..1a31e6c6a5ff 100644 --- a/drivers/usb/gadget/function/uvc.h +++ b/drivers/usb/gadget/function/uvc.h @@ -88,6 +88,7 @@ struct uvc_video { struct usb_ep *ep; struct work_struct pump; + struct workqueue_struct *async_wq; /* Frame parameters */ u8 bpp; diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c index 511f106f9843..d6dbf9b763b2 100644 --- a/drivers/usb/gadget/function/uvc_v4l2.c +++ b/drivers/usb/gadget/function/uvc_v4l2.c @@ -170,7 +170,7 @@ uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b) return ret; if (uvc->state == UVC_STATE_STREAMING) - schedule_work(&video->pump); + queue_work(video->async_wq, &video->pump); return ret; } diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index c00ce0e91f5d..bb037fcc90e6 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -277,7 +277,7 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req) spin_unlock_irqrestore(&video->req_lock, flags); if (uvc->state == UVC_STATE_STREAMING) - schedule_work(&video->pump); + queue_work(video->async_wq, &video->pump); } static int @@ -485,7 +485,7 @@ int uvcg_video_enable(struct uvc_video *video, int enable) video->req_int_count = 0; - schedule_work(&video->pump); + queue_work(video->async_wq, &video->pump); return ret; } @@ -499,6 +499,11 @@ int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc) spin_lock_init(&video->req_lock); INIT_WORK(&video->pump, uvcg_video_pump); + /* Allocate a work queue for asynchronous video pump handler. */ + video->async_wq = alloc_workqueue("uvcgadget", WQ_UNBOUND | WQ_HIGHPRI, 0); + if (!video->async_wq) + return -EINVAL; + video->uvc = uvc; video->fcc = V4L2_PIX_FMT_YUYV; video->bpp = 16; |