staging: unisys: visorinput: ensure proper locking wrt creation & ints

Ensure we properly lock between visorinput_channel_interrupt(),
visorinput_open(), and devdata_create().  We now guarantee that:

* interrupts will be disabled and remain disabled during device creation,
  by setting 'paused = true' across device creation

* we canNOT get into visorinput_open() until the device structure is
  totally initialized, by delaying the input_register_device() until the
  end of device initialization

We also now ensure that lock_visor_dev is held across updates of devdata
state, to ensure state consistency.

Signed-off-by: Tim Sell <[email protected]>
Signed-off-by: David Kershner <[email protected]>
Acked-By: Neil Horman <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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