Merge branch 'poll-pwc2' of /home/v4l/v4l/patchwork

* 'poll-pwc2' of /home/v4l/v4l/patchwork:
  [media] gspca_pac207: Raise max exposure + various autogain setting tweaks
  [media] pwc: read new preset values when changing awb control to a preset
  [media] pwc: poll(): Check that the device has not beem claimed for streaming already
  [media] pwc: rework locking
  [media] pwc: Make auto white balance speed and delay available as v4l2 controls
  [media] pwc: properly mark device_hint as unused in all probe error paths
  [media] pwc: Add support for control events
  [media] vivi: let vb2_poll handle events
  [media] videobuf2-core: also test for pending events
  [media] videobuf: only start streaming in poll() if so requested by the poll mask
  [media] videobuf2: only start streaming in poll() if so requested by the poll mask
  [media] ivtv: only start streaming in poll() if polling for input
  [media] poll: add poll_requested_events() function