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[ Upstream commitf3d384e366] 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@tsinghua.edu.cn> Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Fixes:5cc7522d89("media: sun6i: Add support for Allwinner CSI V3s") Acked-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>