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Add two functions that can be used to stop new jobs from being queued / continue running queued job. This can be used while a driver using m2m helper is going to suspend / wake up from resume, and can ensure that there's no job running in suspend process. Signed-off-by: Pi-Hsun Shih <pihsun@chromium.org> Signed-off-by: Jerry-ch Chen <jerry-ch.chen@mediatek.corp-partner.google.com> Reviewed-by: Tomasz Figa <tfiga@chromium.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>