Hi Ricardo,
Thank you for the patch.
On Wed, Dec 23, 2020 at 12:04:39AM +0100, Ricardo Ribalda wrote:
> Provide a code path for events that can be sent without a work-queue,
> this is, that do not belong to an URB and are not handled in the top
> half on an irq-handled.
>
> Signed-off-by: Ricardo Ribalda <riba...@chromium.org>
> ---
> drivers/media/usb/uvc/uvc_ctrl.c | 35 +++++++++++++++++++++++++++-----
> drivers/media/usb/uvc/uvcvideo.h | 2 ++
> 2 files changed, 32 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c
> b/drivers/media/usb/uvc/uvc_ctrl.c
> index 9f6174a10e73..5fe228a3213b 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1254,17 +1254,14 @@ static void uvc_ctrl_send_slave_event(struct
> uvc_video_chain *chain,
> uvc_ctrl_send_event(chain, handle, ctrl, mapping, val, changes);
> }
>
> -static void uvc_ctrl_status_event_work(struct work_struct *work)
> +static void __uvc_ctrl_status_event(struct uvc_device *dev,
> + struct uvc_ctrl_work *w)
As this function doesn't deal with the work queue, should it receive the
members of uvc_ctrl_work as direct arguments ? You could then drop the
separate uvc_ctrl_status_event_direct(), or rather rename this function
to uvc_ctrl_status_event_direct().
Speaking of names, maybe uvc_ctrl_status_event() should be renamed to
uvc_ctrl_status_event_async(), and this function become
uvc_ctrl_status_event() ?
> {
> - struct uvc_device *dev = container_of(work, struct uvc_device,
> - async_ctrl.work);
> - struct uvc_ctrl_work *w = &dev->async_ctrl;
> struct uvc_video_chain *chain = w->chain;
> struct uvc_control_mapping *mapping;
> struct uvc_control *ctrl = w->ctrl;
> struct uvc_fh *handle;
> unsigned int i;
> - int ret;
>
> mutex_lock(&chain->ctrl_mutex);
>
> @@ -1291,6 +1288,16 @@ static void uvc_ctrl_status_event_work(struct
> work_struct *work)
> }
>
> mutex_unlock(&chain->ctrl_mutex);
> +}
> +
> +static void uvc_ctrl_status_event_work(struct work_struct *work)
> +{
> + struct uvc_device *dev = container_of(work, struct uvc_device,
> + async_ctrl.work);
> + struct uvc_ctrl_work *w = &dev->async_ctrl;
> + int ret;
> +
> + __uvc_ctrl_status_event(dev, w);
>
> /* Resubmit the URB. */
> w->urb->interval = dev->int_ep->desc.bInterval;
> @@ -1321,6 +1328,24 @@ bool uvc_ctrl_status_event(struct urb *urb, struct
> uvc_video_chain *chain,
> return true;
> }
>
> +void uvc_ctrl_status_event_direct(struct uvc_video_chain *chain,
> + struct uvc_control *ctrl, const u8 *data)
> +{
> + struct uvc_device *dev = chain->dev;
> + struct uvc_ctrl_work w;
> +
> + if (list_empty(&ctrl->info.mappings)) {
> + ctrl->handle = NULL;
> + return;
> + }
> +
> + w.data = data;
> + w.chain = chain;
> + w.ctrl = ctrl;
> +
> + __uvc_ctrl_status_event(dev, &w);
> +}
> +
> static bool uvc_ctrl_xctrls_has_control(const struct v4l2_ext_control
> *xctrls,
> unsigned int xctrls_count, u32 id)
> {
> diff --git a/drivers/media/usb/uvc/uvcvideo.h
> b/drivers/media/usb/uvc/uvcvideo.h
> index c50b0546901f..d7954dcc2b60 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -845,6 +845,8 @@ void uvc_ctrl_cleanup_device(struct uvc_device *dev);
> int uvc_ctrl_restore_values(struct uvc_device *dev);
> bool uvc_ctrl_status_event(struct urb *urb, struct uvc_video_chain *chain,
> struct uvc_control *ctrl, const u8 *data);
> +void uvc_ctrl_status_event_direct(struct uvc_video_chain *chain,
> + struct uvc_control *ctrl, const u8 *data);
>
> int uvc_ctrl_begin(struct uvc_video_chain *chain);
> int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
--
Regards,
Laurent Pinchart
