diff options
| author | Michael Grzeschik <m.grzeschik@pengutronix.de> | 2022-09-08 00:58:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-09-09 10:30:18 +0300 |
| commit | 9b91a65230784a9ef644b8bdbb82a79ba4ae9456 (patch) | |
| tree | 3eea9295f4086b0435701f94a8f72d9b36eb4160 /drivers/usb/gadget/function/uvc_video.c | |
| parent | d818320ea200b02f2fea693b2be204f1990bb7e9 (diff) | |
| download | linux-9b91a65230784a9ef644b8bdbb82a79ba4ae9456.tar.xz | |
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/function/uvc_video.c')
| -rw-r--r-- | drivers/usb/gadget/function/uvc_video.c | 9 |
1 files changed, 7 insertions, 2 deletions
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; |