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For mem2mem devices we have to make sure that v4l2_m2m_try_schedule() is called whenever a request is queued. We do that by creating a vb2_m2m_request_queue() helper that should be used instead of the 'normal' vb2_request_queue() helper. The m2m helper function will call v4l2_m2m_try_schedule() as needed. In addition we also avoid calling v4l2_m2m_try_schedule() when preparing or queueing a buffer for a request since that is no longer needed. Instead this helper function will do that when the request is actually queued. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>