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Without these ops the v4l2-compliance blocking wait test will fail. These ops are required to ensure that when VIDIOC_DQBUF has to wait for buffers to arrive, the queue lock is correctly released and retaken. Otherwise the wait for a buffer would block all other queue ioctls. Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Cc: Stanimir Varbanov <stanimir.k.varbanov@gmail.com> Reviewed-by: Dikshita Agarwal <quic_dikshita@quicinc.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>