linux-kernel - Re: [PATCH 1/1] arm: devtree: fix missing device

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Message-ID: <0b96911d-a6f3-44d9-a273-0e9c71da2e9b@gmail.com>
Date: Mon, 29 Jul 2024 12:18:25 +0200
From: vincenzo mezzela <vincenzo.mezzela@...il.com>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>, linux@...linux.org.uk,
 robh@...nel.org, rmk+kernel@...linux.org.uk
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 skhan@...uxfoundation.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] arm: devtree: fix missing device_node cleanup

On 7/12/24 11:47, Javier Carrasco wrote:
> On 12/07/2024 11:44, Vincenzo Mezzela wrote:
>> Device node `cpus` is allocated but never released using `of_node_put`.
>>
>> This patch introduces the __free attribute for `cpus` device_node that
>> automatically handle the cleanup of the resource by adding a call to
>> `of_node_put` at the end of the current scope. This enhancement aims to
>> mitigate memory management issues associated with forgetting to release
>> the resources.
>>
>> Signed-off-by: Vincenzo Mezzela <vincenzo.mezzela@...il.com>
>> ---
>>   arch/arm/kernel/devtree.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
>> index fdb74e64206a..223d66a5fff3 100644
>> --- a/arch/arm/kernel/devtree.c
>> +++ b/arch/arm/kernel/devtree.c
>> @@ -70,14 +70,14 @@ void __init arm_dt_init_cpu_maps(void)
>>   	 * contain a list of MPIDR[23:0] values where MPIDR[31:24] must
>>   	 * read as 0.
>>   	 */
>> -	struct device_node *cpu, *cpus;
>>   	int found_method = 0;
>>   	u32 i, j, cpuidx = 1;
>>   	u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
>>   
>>   	u32 tmp_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
>>   	bool bootcpu_valid = false;
>> -	cpus = of_find_node_by_path("/cpus");
>> +	struct device_node *cpu;
>> +	struct device_node *cpus __free(device_node) = of_find_node_by_path("/cpus");
>>   
>>   	if (!cpus)
>>   		return;
> Hello Vincenzo,
>
> If this is a fix, please provide the Fixes: tag as well as Cc: for
> stable if it applies.
>
> Best regards, Javier Carrasco

Sure, will do. :)


Best regards,

Vincenzo


Fixes: a0ae02405076a ("ARM: kernel: add device tree init map function")
Cc: stable@...r.kernel.org