linux-kernel - [PATCH 4.9 29/44] Revert "usb: gadget: uvc: Add missing call for additional setup data"

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Message-Id: <20170316142927.175364393@linuxfoundation.org>
Date:   Thu, 16 Mar 2017 23:29:54 +0900
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Roger Quadros <rogerq@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: [PATCH 4.9 29/44] Revert "usb: gadget: uvc: Add missing call for additional setup data"

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roger Quadros <rogerq@...com>

commit eb38d913c27f32f4df173791051fecf6aca34173 upstream.

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

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/function/f_uvc.c |    7 -------
 1 file changed, 7 deletions(-)

--- 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 *
 	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;
 }