linux-kernel - Re: [RESEND PATCH 2/2] thermal: sprd: add missing of_node

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Date:   Mon, 14 Jun 2021 21:16:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Amit Kucheria <amitk@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH 2/2] thermal: sprd: add missing of_node_put for
 loop iteration

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@...onical.com>
>> Acked-by: Chunyan Zhang <zhang.lyra@...il.com>
>> ---
>>  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