linux-kernel - Re:Re: [PATCH] arch: arm: mach-spear: Add missing of_node

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Date:   Thu, 16 Jun 2022 14:25:12 +0800 (CST)
From:   "Liang He" <windhl@....com>
To:     "Viresh Kumar" <viresh.kumar@...aro.org>
Cc:     vireshk@...nel.org, shiraz.linux.kernel@...il.com, soc@...nel.org,
        linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] arch: arm: mach-spear: Add missing of_node_put() in
 time.c


At 2022-06-16 14:06:05, "Viresh Kumar" <viresh.kumar@...aro.org> wrote:
>On 15-06-22, 20:39, Liang He wrote:
>> In spear_setup_of_timer(), of_find_matching_node() will return a
>> node pointer with refcount incrementd. We should use of_node_put()
>> in each fail path or when it is not used anymore.
>> 
>> Signed-off-by: Liang He <windhl@....com>
>> ---
>>  arch/arm/mach-spear/time.c | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>> 
>> diff --git a/arch/arm/mach-spear/time.c b/arch/arm/mach-spear/time.c
>> index d1fdb6066f7b..a1b6635b4ecb 100644
>> --- a/arch/arm/mach-spear/time.c
>> +++ b/arch/arm/mach-spear/time.c
>> @@ -217,16 +217,20 @@ void __init spear_setup_of_timer(void)
>>  
>>  	irq = irq_of_parse_and_map(np, 0);
>>  	if (!irq) {
>> +		of_node_put(np);
>>  		pr_err("%s: No irq passed for timer via DT\n", __func__);
>>  		return;
>>  	}
>>  
>>  	gpt_base = of_iomap(np, 0);
>>  	if (!gpt_base) {
>> +		of_node_put(np);
>>  		pr_err("%s: of iomap failed\n", __func__);
>>  		return;
>>  	}
>> -
>> +	
>> +	of_node_put(np);
>> +	
>>  	gpt_clk = clk_get_sys("gpt0", NULL);
>>  	if (IS_ERR(gpt_clk)) {
>>  		pr_err("%s:couldn't get clk for gpt\n", __func__);
>
>Since this routine already have error labels, for consistence it would be better
>to add another one "err_put_np" and use goto to that ?
>
>-- 
>viresh


Thanks for your reply. I will make a new patch for that.

Liang