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

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Message-ID: <d5a42f3a-5bf6-4f1a-b8f1-0254770856a5@arm.com>
Date: Fri, 2 Aug 2024 08:50:17 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Javier Carrasco <javier.carrasco.cruz@...il.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 11:37, Javier Carrasco wrote:
> 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.

Ah, apologies, was looking at the non-scoped version. I will queue this.

Suzuki
> 
> Best regards,
> Javier Carrasco