From cedb983b52915ae2dc9bda99e59731909383c39f Mon Sep 17 00:00:00 2001
From: Baoyou Xie <baoyou.xie@linaro.org>
Date: Wed, 6 Sep 2017 22:59:48 -0400
Subject: [PATCH] UPSTREAM: media: uvcvideo: Mark buffer error where overflow

Some cameras post inaccurate frame where next frame data overlap
it. this results in screen flicker, and it need to be prevented.

So this patch marks the buffer error to discard the frame where
buffer overflow.

Change-Id: Ibd41b93cf8376b126b6d107a59ab22907fb839e6
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
(cherry picked from commit dfc1648c576719b5a2701805aab1e208789d5969)
---
 drivers/media/usb/uvc/uvc_video.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 2b276ab7764f..684c34257282 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1088,6 +1088,7 @@ static void uvc_video_decode_data(struct uvc_streaming *stream,
 	/* Complete the current frame if the buffer size was exceeded. */
 	if (len > maxlen) {
 		uvc_trace(UVC_TRACE_FRAME, "Frame complete (overflow).\n");
+		buf->error = 1;
 		buf->state = UVC_BUF_STATE_READY;
 	}
 }