linux-kernel - Re: [PATCH v8 3/4] usb: gadget: uvc: move video disable logic to its own function

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Date:   Fri, 27 Oct 2023 13:57:35 +0100
From:   Dan Scally <dan.scally@...asonboard.com>
To:     Avichal Rakesh <arakesh@...gle.com>, gregkh@...uxfoundation.org,
        laurent.pinchart@...asonboard.com
Cc:     etalvala@...gle.com, jchowdhary@...gle.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        m.grzeschik@...gutronix.de
Subject: Re: [PATCH v8 3/4] usb: gadget: uvc: move video disable logic to its
 own function

Hi Avichal

On 24/10/2023 19:36, Avichal Rakesh wrote:
> This patch refactors the video disable logic in uvcg_video_enable
> into its own separate function 'uvcg_video_disable'.
In that case, can we just replace any calls to uvcg_video_enable(video, 0) with calls to 
uvcg_video_disable() directly and drop the enable argument from uvcg_video_enable()?
> Suggested-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
> Signed-off-by: Avichal Rakesh <arakesh@...gle.com>
> ---
> v6: Introduced this patch to make the next one easier to review
> v6 -> v7: Add Suggested-by
> v7 -> v8: No change. Getting back in review queue
>
>   drivers/usb/gadget/function/uvc_video.c | 37 +++++++++++++++----------
>   1 file changed, 23 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
> index c180866c8e34..80b8eaea2d39 100644
> --- a/drivers/usb/gadget/function/uvc_video.c
> +++ b/drivers/usb/gadget/function/uvc_video.c
> @@ -493,13 +493,33 @@ static void uvcg_video_pump(struct work_struct *work)
>   	return;
>   }
>
> +/*
> + * Disable video stream
> + */
> +static int
> +uvcg_video_disable(struct uvc_video *video)
> +{
> +	struct uvc_request *ureq;
> +
> +	cancel_work_sync(&video->pump);
> +	uvcg_queue_cancel(&video->queue, 0);
> +
> +	list_for_each_entry(ureq, &video->ureqs, list) {
> +		if (ureq->req)
> +			usb_ep_dequeue(video->ep, ureq->req);
> +	}
> +
> +	uvc_video_free_requests(video);
> +	uvcg_queue_enable(&video->queue, 0);
> +	return 0;
> +}
> +
>   /*
>    * Enable or disable the video stream.
>    */
>   int uvcg_video_enable(struct uvc_video *video, int enable)
>   {
>   	int ret;
> -	struct uvc_request *ureq;
>
>   	if (video->ep == NULL) {
>   		uvcg_info(&video->uvc->func,
> @@ -507,19 +527,8 @@ int uvcg_video_enable(struct uvc_video *video, int enable)
>   		return -ENODEV;
>   	}
>
> -	if (!enable) {
> -		cancel_work_sync(&video->pump);
> -		uvcg_queue_cancel(&video->queue, 0);
> -
> -		list_for_each_entry(ureq, &video->ureqs, list) {
> -			if (ureq->req)
> -				usb_ep_dequeue(video->ep, ureq->req);
> -		}
> -
> -		uvc_video_free_requests(video);
> -		uvcg_queue_enable(&video->queue, 0);
> -		return 0;
> -	}
> +	if (!enable)
> +		return uvcg_video_disable(video);
>
>   	if ((ret = uvcg_queue_enable(&video->queue, 1)) < 0)
>   		return ret;
> --
> 2.42.0.758.gaed0368e0e-goog