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[ Upstream commit 5f3ce14fae742d1d23061c3122d93edb879ebf53 ] Add a helper function which returns whether the subdevice is streaming, i.e. if .s_stream or .enable_streams has been called successfully. Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Tested-by: Umang Jain <umang.jain@ideasonboard.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Stable-dep-of: 36cef585e2a3 ("media: vimc: skip .s_stream() for stopped entities") Signed-off-by: Sasha Levin <sashal@kernel.org>