• Hans Verkuil's avatar
    [media] vb2: fix VBI/poll regression · 58d75f4b
    Hans Verkuil authored
    The recent conversion of saa7134 to vb2 unconvered a poll() bug that
    broke the teletext applications alevt and mtt. These applications
    expect that calling poll() without having called VIDIOC_STREAMON will
    cause poll() to return POLLERR. That did not happen in vb2.
    
    This patch fixes that behavior. It also fixes what should happen when
    poll() is called when STREAMON is called but no buffers have been
    queued. In that case poll() will also return POLLERR, but only for
    capture queues since output queues will always return POLLOUT
    anyway in that situation.
    
    This brings the vb2 behavior in line with the old videobuf behavior.
    Signed-off-by: 's avatarHans Verkuil <hans.verkuil@cisco.com>
    Acked-by: 's avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
    Signed-off-by: 's avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
    58d75f4b
videobuf2-core.h 24.1 KB