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The poll documentation was incomplete: document how events (POLLPRI) are handled and fix the documentation of what poll does for display devices and streaming I/O. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>