linux-kernel - RE: [PATCH 6/6] da8xx: enable the use of the ICPFUNC in i2c-davinci

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Date:	Thu, 14 Apr 2011 14:56:38 +0530
From:	"Nori, Sekhar" <nsekhar@...com>
To:	Mike Williamson <michael.williamson@...ticallink.com>
CC:	Ben Gardiner <bengardiner@...ometrics.ca>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Ben Dooks <ben-linux@...ff.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bastian Ruppert <Bastian.Ruppert@...erin.de>,
	Philby John <pjohn@...mvista.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 6/6] da8xx: enable the use of the ICPFUNC in i2c-davinci

Hi Mike,

On Thu, Apr 14, 2011 at 04:34:34, Mike Williamson wrote:

> > The I2C driver implements a default platform data
> > so it should actually be legal for a DA8x board to
> > pass NULL platform data. In that case this line
> > will crash. You should either check for pdata to
> > be NULL or just let each board choose whether it
> > needs recovery (I think the better option).
> >
> 
> I actually had a problem with using NULL for pdata with davinci I2C
> and had submitted a patch here that sort of fell on the floor.  The
> problem was that the i2c_davinci_calc_clk_dividers is using
> platform_data without a check as described above.  So at the moment
> using NULL doesn't really work, best as I can tell...
> 
> https://lkml.org/lkml/2010/9/4/119

Looking at this mail chain, it looks like Ben was actually OK
with your first submission and just wanted you to update the
patch description saying that dev->platform_data is accessed
later in the code and that is why it needs to be updated.

I liked your first attempt better and may be you should
try another submission with the patch description updated.

Thanks,
Sekhar

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