linux-kernel - Re:Re: [PATCH] mips: lantiq: Add missing of_node

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Message-ID: <5b777944.84cc.18186e4f5ba.Coremail.windhl@126.com>
Date:   Tue, 21 Jun 2022 23:32:41 +0800 (CST)
From:   "Liang He" <windhl@....com>
To:     "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>
Cc:     john@...ozen.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] mips: lantiq: Add missing of_node_put() in irq.c



At 2022-06-21 23:21:19, "Thomas Bogendoerfer" <tsbogend@...ha.franken.de> wrote:
>On Wed, Jun 15, 2022 at 11:33:39PM +0800, Liang He wrote:
>> In icu_of_init(), of_find_compatible_node() will return a node
>> pointer with refcount incremented. We should use of_node_put()
>> when it is not used anymore.
>> 
>> Signed-off-by: Liang He <windhl@....com>
>> ---
>>  arch/mips/lantiq/irq.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>> 
>> diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c
>> index b732495f138a..62f1b20a2169 100644
>> --- a/arch/mips/lantiq/irq.c
>> +++ b/arch/mips/lantiq/irq.c
>> @@ -396,6 +396,9 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent)
>>  
>>  		ret = of_property_read_u32_array(eiu_node, "lantiq,eiu-irqs",
>>  						ltq_eiu_irq, exin_avail);
>> +						
>
>trailing whitespaces
>
>> +		of_node_put(eiu_node);
>> +						
>
>trailing whitespaces
>
>>  		if (ret)
>>  			panic("failed to load external irq resources");
>>  
>> @@ -409,6 +412,9 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent)
>>  			panic("Failed to remap eiu memory");
>>  	}
>>  
>> +	/* if eiu_node&of_address_to_resource */
>> +	of_node_put(eiu_node);
>> +
>
>if I'm not mistaken you are freeing the taken reference twice. Shouldn't
>it work by only adding the last of_node_put() ?
>
>Thomas.

Hi, Thomas.

Thanks very much for your effort to review and apply my patches.

You are right, this patch is wrong and only the last put is needed.

I will send a new patch: removing trailing whitspace and the first put.

Thans again.

Liang

>
>-- 
>Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
>good idea.                                                [ RFC1925, 2.3 ]