lesavka/scripts/kernel/uvc-debug.patch

--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -763,12 +763,44 @@
 {
 	int ret;
 
+	if (!video) {
+		pr_err("uvcg_video_enable: missing video\n");
+		return -EINVAL;
+	}
+
+	if (!video->uvc || !video->uvc->func.config ||
+	    !video->uvc->func.config->cdev) {
+		pr_err("uvcg_video_enable: missing uvc/func/config video=%p uvc=%p\n",
+		       video, video->uvc);
+		return -ENODEV;
+	}
+
 	if (video->ep == NULL) {
 		uvcg_info(&video->uvc->func,
 			  "Video enable failed, device is uninitialized.\n");
 		return -ENODEV;
 	}
 
+	if (!video->kworker || !video->async_wq) {
+		uvcg_err(&video->uvc->func,
+			"Video enable failed, missing worker(s) kworker=%p async_wq=%p\n",
+			video->kworker, video->async_wq);
+		return -EINVAL;
+	}
+
+	if (!video->queue.queue.dev) {
+		uvcg_err(&video->uvc->func,
+			"Video enable failed, missing queue device\n");
+		return -EINVAL;
+	}
+
+	uvcg_info(&video->uvc->func,
+		"Video enable start: video=%p ep=%p kworker=%p async_wq=%p req_size=%u max_payload=%u requests=%u reqs_per_frame=%u use_sg=%u flags=0x%x\n",
+		video, video->ep, video->kworker, video->async_wq,
+		video->req_size, video->max_payload_size,
+		video->uvc_num_requests, video->reqs_per_frame,
+		video->queue.use_sg, video->queue.flags);
+
 	/*
 	 * Safe to access request related fields without req_lock because
 	 * this is the only thread currently active, and no other