linux-kernel - Re: [PATCH 1/4] MMC: omap_hsmmc: set platform data after probe from DT node

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Date:	Sat, 13 Oct 2012 13:37:20 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Daniel Mack <zonque@...il.com>
CC:	Balaji T K <balajitk@...com>, linux-mmc@...r.kernel.org,
	Venkatraman S <svenkatr@...com>, Chris Ball <cjb@...top.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-omap@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/4] MMC: omap_hsmmc: set platform data after probe from DT node



Daniel Mack <zonque@...il.com> wrote:

>On 13.10.2012 10:48, Grant Likely wrote:
>> 
>> somedriver_probe(struct platform_device *pdev)
>> {
>>       struct somedriver_private *somedriver;
>> 
>>       somedriver = devm_kzalloc(sizeof (*somedriver), GFP_KERNEL);
>>       somedriver->pdata = pdev->platform_data;
>>       if (OF)
>>               somedriver->pdata = devm_kzalloc(sizeof
>> (*somedriver->pdata), GFP_KERNEL);
>> }
>> 
>> The bonus with using devm_kzalloc is the driver doesn't even need to
>> do anything special to undo these allocations on failure or release.
>> :-)
>
>Ok, understood. Will keep an eye on this in the future. Thanks again
>for
>the explanation.
>
>For this particular driver, this means that both my and Balaji's ways
>of
>fixing this are wrong?

Balaji's patch looks fine since it uses a local copy of the platform data structure. It appears that the driver is already creating a local copy and Balaji is just bug fixing call sites that aren't using it yet.

g.

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