diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c
index 29bfc2bf796b..7e32d741b93b 100644
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -1052,6 +1052,8 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 
 	if (WARN_ON(vb->state != VB2_BUF_STATE_ACTIVE))
 		return;
+	else
+		pr_err("vb2_buffer_done Enter, vb->state %d\n", vb->state);
 
 	if (WARN_ON(state != VB2_BUF_STATE_DONE &&
 		    state != VB2_BUF_STATE_ERROR &&
@@ -1074,10 +1076,12 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 	spin_lock_irqsave(&q->done_lock, flags);
 	if (state == VB2_BUF_STATE_QUEUED) {
 		vb->state = VB2_BUF_STATE_QUEUED;
+		pr_err("vb2_buffer_done doesn't add, vb->state %d\n", vb->state);
 	} else {
 		/* Add the buffer to the done buffers list */
 		list_add_tail(&vb->done_entry, &q->done_list);
 		vb->state = state;
+		pr_err("vb2_buffer_done list_add_tail, vb->state %d\n", vb->state);
 	}
 	atomic_dec(&q->owned_by_drv_count);
 
@@ -2490,9 +2494,15 @@ __poll_t vb2_core_poll(struct vb2_queue *q, struct file *file,
 	poll_wait(file, &q->done_wq, wait);
 
 	if (!q->is_output && !(req_events & (EPOLLIN | EPOLLRDNORM)))
+	{
+		pr_err("vb2_core_poll ERROR: line %d \n", __LINE__);
 		return 0;
+	}
 	if (q->is_output && !(req_events & (EPOLLOUT | EPOLLWRNORM)))
+	{
+		pr_err("vb2_core_poll ERROR: line %d \n", __LINE__);
 		return 0;
+	}
 
 	/*
 	 * Start file I/O emulator only if streaming API has not been used yet.
@@ -2562,6 +2572,13 @@ __poll_t vb2_core_poll(struct vb2_queue *q, struct file *file,
 				EPOLLOUT | EPOLLWRNORM :
 				EPOLLIN | EPOLLRDNORM;
 	}
+	if (vb)
+		pr_err("vb2_core_poll ERROR: line %d vb %p vb->state %d list_empty(&q->done_list) %d\n",
+			__LINE__, vb, vb->state, list_empty(&q->done_list));
+	else
+		pr_err("vb2_core_poll ERROR: line %d list_empty(&q->done_list) %d\n",
+			__LINE__, list_empty(&q->done_list));
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(vb2_core_poll);
diff --git a/drivers/media/platform/virtio/virtio-camera.c b/drivers/media/platform/virtio/virtio-camera.c
index 705f150cc0b3..f54491c2d9eb 100644
--- a/drivers/media/platform/virtio/virtio-camera.c
+++ b/drivers/media/platform/virtio/virtio-camera.c
@@ -149,6 +149,7 @@ static void virtio_camera_control_ack(struct virtqueue *vq)
 	struct vb2_v4l2_buffer *vbuf;
 	unsigned int len;
 
+	pr_err("virtio-camera: %s enter and wait vcam_vq->lock\n", __func__);
 	spin_lock_irq(&vcam_vq->lock);
 	while ((req = virtqueue_get_buf(vq, &len))) {
 		complete(&req->completion);
@@ -158,14 +159,18 @@ static void virtio_camera_control_ack(struct virtqueue *vq)
 			vbuf->sequence = req->resp.u.buffer.sequence;
 			vbuf->vb2_buf.timestamp = req->resp.u.buffer.timestamp;
 			vbuf->planes[0].bytesused = req->resp.u.format.size.sizeimage;
+			pr_err("virtio-camera: %s enter and call vb2_buffer_done\n", __func__);
 			vb2_buffer_done(req->vb, VB2_BUF_STATE_DONE);
-			pr_debug("virtio-camera: mark the buffer done. UUID is %d, ptr is %pK\n",
+			pr_err("virtio-camera: mark the buffer done. UUID is %d, ptr is %p\n",
 			req->resp.u.buffer.uuid[0] + req->resp.u.buffer.uuid[1], req->vb);
 
 			kfree(req);
+		} else {
+			pr_err("virtio-camera:%s req->vb is null\n", __func__);
 		}
 	}
 	spin_unlock_irq(&vcam_vq->lock);
+	pr_err("virtio-camera: %s %d unblock vcam_vq->lock\n", __func__, __LINE__);
 }
 
 static int vcam_vq_request(struct virtio_camera_video *vnode,
@@ -195,11 +200,13 @@ static int vcam_vq_request(struct virtio_camera_video *vnode,
 	if (ret) {
 		pr_err("%s: fail to add req to vq, errno is %d\n", __func__, ret);
 		spin_unlock_irq(&vnode->ctr_vqx->lock);
+		pr_err("virtio-camera: %s %d unblock vcam_vq->lock\n", __func__, __LINE__);
 		return ret;
 	}
 
 	virtqueue_kick(vnode->ctr_vqx->vq);
 	spin_unlock_irq(&vnode->ctr_vqx->lock);
+	pr_err("virtio-camera: %s %d unblock vcam_vq->lock\n", __func__, __LINE__);
 
 	if (async)
 		return 0;