linux-kernel - Re: [PATCH v2 2/3] media: uvcvideo: Send control events for partial succeeds

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Message-ID: <20250422205515.GN17813@pendragon.ideasonboard.com>
Date: Tue, 22 Apr 2025 23:55:15 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH v2 2/3] media: uvcvideo: Send control events for partial
 succeeds

Hi Ricardo,

Thank you for the patch.

On Mon, Feb 24, 2025 at 10:34:54AM +0000, Ricardo Ribalda wrote:
> Today, when we are applying a change to entities A, B. If A succeeds and B
> fails the events for A are not sent.
> 
> This change changes the code so the events for A are send right after

s/send/sent/

> they happen.
> 
> Cc: stable@...nel.org
> Fixes: b4012002f3a3 ("[media] uvcvideo: Add support for control events")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index f2484f6d21c1..7d074686eef4 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1705,7 +1705,9 @@ static bool uvc_ctrl_xctrls_has_control(const struct v4l2_ext_control *xctrls,
>  }
>  
>  static void uvc_ctrl_send_events(struct uvc_fh *handle,
> -	const struct v4l2_ext_control *xctrls, unsigned int xctrls_count)
> +				 struct uvc_entity *entity,
> +				 const struct v4l2_ext_control *xctrls,
> +				 unsigned int xctrls_count)
>  {
>  	struct uvc_control_mapping *mapping;
>  	struct uvc_control *ctrl;
> @@ -1716,6 +1718,9 @@ static void uvc_ctrl_send_events(struct uvc_fh *handle,
>  		u32 changes = V4L2_EVENT_CTRL_CH_VALUE;
>  
>  		ctrl = uvc_find_control(handle->chain, xctrls[i].id, &mapping);
> +		if (ctrl->entity != entity)
> +			continue;
> +
>  		if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS)
>  			/* Notification will be sent from an Interrupt event. */
>  			continue;
> @@ -1954,11 +1959,12 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
>  					uvc_ctrl_find_ctrl_idx(entity, ctrls,
>  							       err_ctrl);
>  			goto done;
> +		} else if (ret > 0 && !rollback) {
> +			uvc_ctrl_send_events(handle, entity,
> +					     ctrls->controls, ctrls->count);
>  		}
>  	}
>  
> -	if (!rollback)
> -		uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count);
>  	ret = 0;
>  done:
>  	mutex_unlock(&chain->ctrl_mutex);

-- 
Regards,

Laurent Pinchart