linux-kernel - Re: [PATCH] Revert "usb: gadget: uvc: Add missing call for additional setup data"

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Date:   Thu, 02 Mar 2017 12:49:34 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Roger Quadros <rogerq@...com>
Cc:     balbi@...nel.org, petr.cvek@....cz, b-liu@...com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "# v4 . 9+" <stable@...r.kernel.org>
Subject: Re: [PATCH] Revert "usb: gadget: uvc: Add missing call for additional setup data"

Hi Roger,

Thank you for the patch.

On Thursday 02 Mar 2017 10:44:58 Roger Quadros wrote:
> This reverts commit 4fbac5206afd01b717d4bdc58793d471f3391b4b.
> 
> This commit breaks g_webcam when used with uvc-gadget [1].
> 
> The user space application (e.g. uvc-gadget) is responsible for
> sending response to UVC class specific requests on control endpoint
> in uvc_send_response() in uvc_v4l2.c.
> 
> The bad commit was causing a duplicate response to be sent with
> incorrect response data thus causing UVC probe to fail at the host
> and broken control transfer endpoint at the gadget.
> 
> [1] - git://git.ideasonboard.org/uvc-gadget.git
> 
> Cc: <stable@...r.kernel.org> # v4.9+
> Signed-off-by: Roger Quadros <rogerq@...com>

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

> ---
>  drivers/usb/gadget/function/f_uvc.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/f_uvc.c
> b/drivers/usb/gadget/function/f_uvc.c index 27ed51b..29b41b5 100644
> --- a/drivers/usb/gadget/function/f_uvc.c
> +++ b/drivers/usb/gadget/function/f_uvc.c
> @@ -258,13 +258,6 @@ uvc_function_setup(struct usb_function *f, const struct
> usb_ctrlrequest *ctrl) memcpy(&uvc_event->req, ctrl,
> sizeof(uvc_event->req));
>  	v4l2_event_queue(&uvc->vdev, &v4l2_event);
> 
> -	/* Pass additional setup data to userspace */
> -	if (uvc->event_setup_out && uvc->event_length) {
> -		uvc->control_req->length = uvc->event_length;
> -		return usb_ep_queue(uvc->func.config->cdev->gadget->ep0,
> -			uvc->control_req, GFP_ATOMIC);
> -	}
> -
>  	return 0;
>  }

-- 
Regards,

Laurent Pinchart