Re: [RESEND PATCH 2/2] thermal: sprd: add missing of_node_put for loop iteration

[Krzysztof Kozlowski]

On 14/06/2021 19:28, Daniel Lezcano wrote:
> On 28/05/2021 13:50, Krzysztof Kozlowski wrote:
>> Early exits from for_each_available_child_of_node() should decrement the
>> node reference counter.  Reported by Coccinelle:
>>
>>   drivers/thermal/sprd_thermal.c:387:1-23: WARNING:
>>     Function "for_each_child_of_node" should have of_node_put() before goto around lines 391.
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx>
>> Acked-by: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
>> ---
>>  drivers/thermal/sprd_thermal.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/thermal/sprd_thermal.c b/drivers/thermal/sprd_thermal.c
>> index 3682edb2f466..2778971aaf03 100644
>> --- a/drivers/thermal/sprd_thermal.c
>> +++ b/drivers/thermal/sprd_thermal.c
>> @@ -388,6 +388,7 @@ static int sprd_thm_probe(struct platform_device *pdev)
>>  		sen = devm_kzalloc(&pdev->dev, sizeof(*sen), GFP_KERNEL);
>>  		if (!sen) {
>>  			ret = -ENOMEM;
>> +			of_node_put(sen_child);
> 
> Why not a new label for the rollback routine?
> 
> eg. goto out_of_node_put;

Indeed, this should work. When loops end, the sen_child is set to NULL
so of_node_putting it should be fine.

> 
> Or a new function devm_for_each_available_child_of_node() ?

Since there are multiple flavors of this for_each_loop, that might be
too much...


Best regards,
Krzysztof