[media] gadget/uvc: embed video_device

Embed the video_device struct to simplify the error handling and in
order to (eventually) get rid of video_device_alloc/release.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 19 insertions, 27 deletions

diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 3242bc684e2d..cf0df8fbba89 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -222,7 +222,7 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
                 v4l2_event.type = UVC_EVENT_DATA;
                 uvc_event->data.length = req->actual;
                 memcpy(&uvc_event->data.data, req->buf, req->actual);
-                v4l2_event_queue(uvc->vdev, &v4l2_event);
+                v4l2_event_queue(&uvc->vdev, &v4l2_event);
         }
 }
 
@@ -256,7 +256,7 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
         memset(&v4l2_event, 0, sizeof(v4l2_event));
         v4l2_event.type = UVC_EVENT_SETUP;
         memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
-        v4l2_event_queue(uvc->vdev, &v4l2_event);
+        v4l2_event_queue(&uvc->vdev, &v4l2_event);
 
         return 0;
 }
@@ -315,7 +315,7 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
                         memset(&v4l2_event, 0, sizeof(v4l2_event));
                         v4l2_event.type = UVC_EVENT_CONNECT;
                         uvc_event->speed = cdev->gadget->speed;
-                        v4l2_event_queue(uvc->vdev, &v4l2_event);
+                        v4l2_event_queue(&uvc->vdev, &v4l2_event);
 
                         uvc->state = UVC_STATE_CONNECTED;
                 }
@@ -343,7 +343,7 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
 
                 memset(&v4l2_event, 0, sizeof(v4l2_event));
                 v4l2_event.type = UVC_EVENT_STREAMOFF;
-                v4l2_event_queue(uvc->vdev, &v4l2_event);
+                v4l2_event_queue(&uvc->vdev, &v4l2_event);
 
                 uvc->state = UVC_STATE_CONNECTED;
                 return 0;
@@ -370,7 +370,7 @@ 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);
+                v4l2_event_queue(&uvc->vdev, &v4l2_event);
                 return USB_GADGET_DELAYED_STATUS;
 
         default:
@@ -388,7 +388,7 @@ uvc_function_disable(struct usb_function *f)
 
         memset(&v4l2_event, 0, sizeof(v4l2_event));
         v4l2_event.type = UVC_EVENT_DISCONNECT;
-        v4l2_event_queue(uvc->vdev, &v4l2_event);
+        v4l2_event_queue(&uvc->vdev, &v4l2_event);
 
         uvc->state = UVC_STATE_DISCONNECTED;
 
@@ -435,25 +435,19 @@ static int
 uvc_register_video(struct uvc_device *uvc)
 {
         struct usb_composite_dev *cdev = uvc->func.config->cdev;
-        struct video_device *video;
 
         /* TODO reference counting. */
-        video = video_device_alloc();
-        if (video == NULL)
-                return -ENOMEM;
-
-        video->v4l2_dev = &uvc->v4l2_dev;
-        video->fops = &uvc_v4l2_fops;
-        video->ioctl_ops = &uvc_v4l2_ioctl_ops;
-        video->release = video_device_release;
-        video->vfl_dir = VFL_DIR_TX;
-        video->lock = &uvc->video.mutex;
-        strlcpy(video->name, cdev->gadget->name, sizeof(video->name));
-
-        uvc->vdev = video;
-        video_set_drvdata(video, uvc);
-
-        return video_register_device(video, VFL_TYPE_GRABBER, -1);
+        uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
+        uvc->vdev.fops = &uvc_v4l2_fops;
+        uvc->vdev.ioctl_ops = &uvc_v4l2_ioctl_ops;
+        uvc->vdev.release = video_device_release_empty;
+        uvc->vdev.vfl_dir = VFL_DIR_TX;
+        uvc->vdev.lock = &uvc->video.mutex;
+        strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name));
+
+        video_set_drvdata(&uvc->vdev, uvc);
+
+        return video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1);
 }
 
 #define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
@@ -766,8 +760,6 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
 
 error:
         v4l2_device_unregister(&uvc->v4l2_dev);
-        if (uvc->vdev)
-                video_device_release(uvc->vdev);
 
         if (uvc->control_ep)
                 uvc->control_ep->driver_data = NULL;
@@ -898,7 +890,7 @@ static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
 
         INFO(cdev, "%s\n", __func__);
 
-        video_unregister_device(uvc->vdev);
+        video_unregister_device(&uvc->vdev);
         v4l2_device_unregister(&uvc->v4l2_dev);
         uvc->control_ep->driver_data = NULL;
         uvc->video.ep->driver_data = NULL;
diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
index 3390ecd1a1f3..ebe409b9e419 100644
--- a/drivers/usb/gadget/function/uvc.h
+++ b/drivers/usb/gadget/function/uvc.h
@@ -144,7 +144,7 @@ enum uvc_state
 
 struct uvc_device
 {
-        struct video_device *vdev;
+        struct video_device vdev;
         struct v4l2_device v4l2_dev;
         enum uvc_state state;
         struct usb_function func;