3 files changed, 23 insertions, 7 deletions

diff --git a/drivers/usb/gadget/f_uvc.c b/drivers/usb/gadget/f_uvc.c
index 49939e44ed74..38dcedddc52c 100644
--- a/drivers/usb/gadget/f_uvc.c
+++ b/drivers/usb/gadget/f_uvc.c
@@ -266,6 +266,13 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
         return 0;
 }
 
+void uvc_function_setup_continue(struct uvc_device *uvc)
+{
+        struct usb_composite_dev *cdev = uvc->func.config->cdev;
+
+        usb_composite_setup_continue(cdev);
+}
+
 static int
 uvc_function_get_alt(struct usb_function *f, unsigned interface)
 {
@@ -328,7 +335,7 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
                 v4l2_event_queue(uvc->vdev, &v4l2_event);
 
                 uvc->state = UVC_STATE_CONNECTED;
-                break;
+                return 0;
 
         case 1:
                 if (uvc->state != UVC_STATE_CONNECTED)
@@ -345,15 +352,11 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
                 memset(&v4l2_event, 0, sizeof(v4l2_event));
                 v4l2_event.type = UVC_EVENT_STREAMON;
                 v4l2_event_queue(uvc->vdev, &v4l2_event);
-
-                uvc->state = UVC_STATE_STREAMING;
-                break;
+                return USB_GADGET_DELAYED_STATUS;
 
         default:
                 return -EINVAL;
         }
-
-        return 0;
 }
 
 static void
diff --git a/drivers/usb/gadget/uvc.h b/drivers/usb/gadget/uvc.h
index 7e90b1d12d09..817e9e19cecf 100644
--- a/drivers/usb/gadget/uvc.h
+++ b/drivers/usb/gadget/uvc.h
@@ -188,6 +188,7 @@ struct uvc_file_handle
  * Functions
  */
 
+extern void uvc_function_setup_continue(struct uvc_device *uvc);
 extern void uvc_endpoint_stream(struct uvc_device *dev);
 
 extern void uvc_function_connect(struct uvc_device *uvc);
diff --git a/drivers/usb/gadget/uvc_v4l2.c b/drivers/usb/gadget/uvc_v4l2.c
index 0080d073bd5e..2bb5af8d2b23 100644
--- a/drivers/usb/gadget/uvc_v4l2.c
+++ b/drivers/usb/gadget/uvc_v4l2.c
@@ -253,7 +253,19 @@ uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
                 if (*type != video->queue.type)
                         return -EINVAL;
 
-                return uvc_video_enable(video, 1);
+                /* Enable UVC video. */
+                ret = uvc_video_enable(video, 1);
+                if (ret < 0)
+                        return ret;
+
+                /*
+                 * Complete the alternate setting selection setup phase now that
+                 * userspace is ready to provide video frames.
+                 */
+                uvc_function_setup_continue(uvc);
+                uvc->state = UVC_STATE_STREAMING;
+
+                return 0;
         }
 
         case VIDIOC_STREAMOFF: