[PATCH 2/4] spi: split up spi_new_device() to allow two stage registration.

[David Brownell]

On Friday 23 May 2008, Grant Likely wrote:
> Question:  spi_alloc_device() (and the original code) does a
> spi_master_get() on the spi_master device.  Doesn't spi_master_put()
> need to be called when the device is discarded?  spi_dev_put() doesn't
> do that explicitly; is it an implicit operation after a device has
> been deregistered from the spi_master?

Depends whether or not the add() has been done to hook things into
the driver model tree, as I recall.  The add() presumes things are
properly refcounted.  When you make a driver model tree node vanish,
its associated refcounts get updated too.

- Dave