linux-kernel - Re: [PATCH] drivers: remove all i2c_set

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Date:	Mon, 31 May 2010 12:09:12 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	linux-i2c@...r.kernel.org, Jean Delvare <khali@...ux-fr.org>,
	George Joseph <george.joseph@...rview5.com>,
	Riku Voipio <riku.voipio@....fi>,
	Guillaume Ligneul <guillaume.ligneul@...il.com>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Alessandro Rubini <rubini@...vis.unipv.it>,
	Richard Purdie <rpurdie@...ys.net>,
	Colin Leroy <colin@...ino.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Paul Gortmaker <p_gortmaker@...oo.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Greg Kroah-Hartman <gregkh@...e.de>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	linuxppc-dev@...abs.org, linux-media@...r.kernel.org,
	linux-mtd@...ts.infradead.org, rtc-linux@...glegroups.com,
	devel@...verdev.osuosl.org
Subject: Re: [PATCH] drivers: remove all i2c_set_clientdata(client, NULL)

Hi Wolfram,

On Mon, May 31, 2010 at 02:55:48PM +0200, Wolfram Sang wrote:
> I2C-drivers can use the clientdata-pointer to point to private data. As I2C
> devices are not really unregistered, but merely detached from their driver, it
> used to be the drivers obligation to clear this pointer during remove() or a
> failed probe(). As a couple of drivers forgot to do this, it was agreed that it
> was cleaner if the i2c-core does this clearance when appropriate, as there is
> no guarantee for the lifetime of the clientdata-pointer after remove() anyhow.
> This feature was added to the core with commit
> e4a7b9b04de15f6b63da5ccdd373ffa3057a3681 to fix the faulty drivers.
> 
> As there is no need anymore to clear the clientdata-pointer, remove all current
> occurrences in the drivers to simplify the code and prevent confusion.
> 
> Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>
> Cc: Jean Delvare <khali@...ux-fr.org>
> ---
> 
> Some more notes:
> 
> I waited for rc1 as I knew there were some drivers/patches coming along which
> needed to be processed, too.
> 
> I'd suggest that this goes via the i2c-tree, so we get rid of all occurences at
> once.
> 

Frankly I'd prefer taking input stuff through my tree with the goal of
.36 merge window just to minimize potential merge issues. This is a
simple cleanup patch that has no dependencies, so there is little gain
from doing it all in one go.

Thanks.

-- 
Dmitry
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