linux-kernel - Re: [PATCH 1/4] coresight: cti: use device

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Message-ID: <e7a4fdeb-e83b-4e0d-adb8-7ea58d6b1b7d@gmail.com>
Date: Thu, 1 Aug 2024 12:37:55 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
 Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Michael Hennerich <Michael.Hennerich@...log.com>,
 Lars-Peter Clausen <lars@...afoo.de>, Jonathan Cameron <jic23@...nel.org>,
 Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
 Michal Simek <michal.simek@....com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>, Pavel Machek <pavel@....cz>,
 Lee Jones <lee@...nel.org>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
 linux-leds@...r.kernel.org
Subject: Re: [PATCH 1/4] coresight: cti: use device_* to iterate over device
 child nodes

On 01/08/2024 11:20, Suzuki K Poulose wrote:
> On 01/08/2024 07:13, Javier Carrasco wrote:
>> Drop the manual access to the fwnode of the device to iterate over its
>> child nodes. `device_for_each_child_node` macro provides direct access
>> to the child nodes, and given that they are only required within the
>> loop, the scoped variant of the macro can be used.
>>
>> Use the `device_for_each_child_node_scoped` macro to iterate over the
>> direct child nodes of the device.
>>
>> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
>> ---
>>   drivers/hwtracing/coresight/coresight-cti-platform.c | 10 +++-------
>>   1 file changed, 3 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-cti-platform.c b/
>> drivers/hwtracing/coresight/coresight-cti-platform.c
>> index ccef04f27f12..d0ae10bf6128 100644
>> --- a/drivers/hwtracing/coresight/coresight-cti-platform.c
>> +++ b/drivers/hwtracing/coresight/coresight-cti-platform.c
>> @@ -416,20 +416,16 @@ static int
>> cti_plat_create_impdef_connections(struct device *dev,
>>                             struct cti_drvdata *drvdata)
>>   {
>>       int rc = 0;
>> -    struct fwnode_handle *fwnode = dev_fwnode(dev);
>> -    struct fwnode_handle *child = NULL;
>>   -    if (IS_ERR_OR_NULL(fwnode))
>> +    if (IS_ERR_OR_NULL(dev_fwnode(dev)))
>>           return -EINVAL;
>>   -    fwnode_for_each_child_node(fwnode, child) {
>> +    device_for_each_child_node_scoped(dev, child) {
>>           if (cti_plat_node_name_eq(child, CTI_DT_CONNS))
>> -            rc = cti_plat_create_connection(dev, drvdata,
>> -                            child);
>> +            rc = cti_plat_create_connection(dev, drvdata, child);
>>           if (rc != 0)
>>               break;
> 
> Don't we need to fwnode_handle_put(child) here, since we removed the
> outer one ?
> 
> Suzuki
> 

Hi Suzuki,

No, we don't need fwnode_handle_put(child) anymore because the scoped
variant of the macro is used.

Best regards,
Javier Carrasco