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

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Date:	Sat, 24 May 2008 00:54:29 -0600
From:	"Grant Likely" <grant.likely@...retlab.ca>
To:	"David Brownell" <david-b@...bell.net>
Cc:	linuxppc-dev@...abs.org, spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, fabrizio.garetto@...il.com,
	jonsmirl@...il.com
Subject: Re: [PATCH 2/4] spi: split up spi_new_device() to allow two stage registration.

On Sat, May 24, 2008 at 12:43 AM, Grant Likely
<grant.likely@...retlab.ca> wrote:
> On Wed, May 21, 2008 at 6:17 PM, David Brownell <david-b@...bell.net> wrote:
>> On Friday 16 May 2008, Grant Likely wrote:
>>>
>>> This patch splits the allocation and registration portions of code out
>>> of spi_new_device() and creates three new functions; spi_alloc_device(),
>>> spi_register_device(), and spi_device_release().
>>
>> I have no problem with the first two, but why the last?
>>
>> If the devices are always allocated by spi_alloc_device() as
>> they should be -- probably through an intermediary -- the
>> only public function necessary for that cleanup should be
>> the existing spi_dev_put().
>
> Ah, okay.  I'm still a bit fuzzy on the device model conventions.
> I'll remove that then.

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?

Thanks,
g.

>
> g.
>
> --
> Grant Likely, B.Sc., P.Eng.
> Secret Lab Technologies Ltd.
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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