linux-kernel - Re: [PATCH 2/2] hwrng: msm: Add PRNG support for MSM SoC's

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Date:	Wed, 09 Oct 2013 11:23:43 +0300
From:	Stanimir Varbanov <svarbanov@...sol.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Matt Mackall <mpm@...enic.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/2] hwrng: msm: Add PRNG support for MSM SoC's

Hi Stephen,

On 10/04/2013 07:37 PM, Stephen Boyd wrote:
> On 10/04/13 09:31, Stanimir Varbanov wrote:
>>
>>>> +static int msm_rng_probe(struct platform_device *pdev)
>>>> +{
>>>> +	struct msm_rng *rng;
>>>> +	struct device_node *np;
>>>> +	struct resource res;
>>>> +	int ret;
>>>> +
>>>> +	np = of_node_get(pdev->dev.of_node);
>>>> +	if (!np)
>>>> +		return -ENODEV;
>>> This is unnecessary.
>> I used this call because CONFIG_OF_DYNAMIC could be enabled at some
>> time. Isn't that possible? I saw that of_node_get|put is used in .probe
>> on few places in drivers.
> 
> So far we aren't selecting that config on ARM.
> 
> If you look at of_device_alloc() you'll see
> 
>     dev->dev.of_node = of_node_get(np);
> 
> so any platform devices created from of_platform_populate won't have
> their of_node go away.

Thanks for the pointers, it makes sense. I'll remove the calls to
of_node_get|put.

regards,
Stan


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