[PATCH] media: platform: sunxi: sun6i-csi: fix error return code of sun6i_video_start_streaming()

[Jia-Ju Bai]

When sun6i_video_remote_subdev() returns NULL to subdev, no error return
code of sun6i_video_start_streaming() is assigned.
To fix this bug, ret is assigned with -EINVAL in this case.

Reported-by: TOTE Robot <oslab at tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990 at gmail.com>
---
 drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
index b55de9ab64d8..3181d0781b61 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
@@ -151,8 +151,10 @@ static int sun6i_video_start_streaming(struct vb2_queue *vq, unsigned int count)
 	}
 
 	subdev = sun6i_video_remote_subdev(video, NULL);
-	if (!subdev)
+	if (!subdev) {
+		ret = -EINVAL;
 		goto stop_media_pipeline;
+	}
 
 	config.pixelformat = video->fmt.fmt.pix.pixelformat;
 	config.code = video->mbus_code;
-- 
2.17.1