linux-kernel - Re: [RFT PATCH] [media] exynos4-is: Fix fimc_is_parse_sensor

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Message-ID: <56F33533.5000201@osg.samsung.com>
Date:	Wed, 23 Mar 2016 21:30:43 -0300
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	Andreas Färber <afaerber@...e.de>,
	linux-kernel@...r.kernel.org
Cc:	linux-samsung-soc@...r.kernel.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	linux-media@...r.kernel.org
Subject: Re: [RFT PATCH] [media] exynos4-is: Fix fimc_is_parse_sensor_config()
 nodes handling

Hello Andreas,

Thanks for your feedback.

On 03/23/2016 07:33 PM, Andreas Färber wrote:
> Hi Javier,
> 
> Am 23.03.2016 um 17:15 schrieb Javier Martinez Canillas:
>> The same struct device_node * is used for looking up the I2C sensor, OF
>> graph endpoint and port. So the reference count is incremented but not
>> decremented for the endpoint and port nodes.
>>
>> Fix this by having separate pointers for each node looked up.
>>
>> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> [...]
>> diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c
>> index 979c388ebf60..0b04a5d25187 100644
>> --- a/drivers/media/platform/exynos4-is/fimc-is.c
>> +++ b/drivers/media/platform/exynos4-is/fimc-is.c
>> @@ -165,6 +165,7 @@ static int fimc_is_parse_sensor_config(struct fimc_is *is, unsigned int index,
>>  						struct device_node *node)
>>  {
>>  	struct fimc_is_sensor *sensor = &is->sensor[index];
>> +	struct device_node *ep, *port;
>>  	u32 tmp = 0;
>>  	int ret;
>>  
>> @@ -175,16 +176,18 @@ static int fimc_is_parse_sensor_config(struct fimc_is *is, unsigned int index,
>>  		return -EINVAL;
>>  	}
>>  
>> -	node = of_graph_get_next_endpoint(node, NULL);
>> -	if (!node)
>> +	ep = of_graph_get_next_endpoint(node, NULL);
>> +	if (!ep)
>>  		return -ENXIO;
>>  
>> -	node = of_graph_get_remote_port(node);
>> -	if (!node)
>> +	port = of_graph_get_remote_port(ep);
>> +	of_node_put(ep);
>> +	if (!port)
>>  		return -ENXIO;
>>  
>>  	/* Use MIPI-CSIS channel id to determine the ISP I2C bus index. */
>> -	ret = of_property_read_u32(node, "reg", &tmp);
>> +	ret = of_property_read_u32(port, "reg", &tmp);
>> +	of_node_put(port);
>>  	if (ret < 0) {
>>  		dev_err(&is->pdev->dev, "reg property not found at: %s\n",
>>  							 node->full_name);
> 
> port->full_name. You'll need to defer the of_node_put(port) then.
>

Right, sorry for missing that and thanks a lot for pointing it out.
 
> Regards,
> Andreas
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America