linux-kernel - Re:Re: [PATCH] input/serio: Fix refcount leak bug in i8042-sparcio

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Date:   Sun, 10 Jul 2022 09:37:10 +0800 (CST)
From:   "Liang He" <windhl@....com>
To:     "Dmitry Torokhov" <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re:Re: [PATCH] input/serio: Fix refcount leak bug in i8042-sparcio






At 2022-07-09 12:49:23, "Dmitry Torokhov" <dmitry.torokhov@...il.com> wrote:
>Hi Liang,
>
>On Sun, Jun 19, 2022 at 03:30:36PM +0800, Liang He wrote:
>> In i8042_platform_init() and i8042_platform_exit(), we need call
>> of_node_put() to keep refcount balance.
>> 
>> Signed-off-by: Liang He <windhl@....com>
>> ---
>>  drivers/input/serio/i8042-sparcio.h | 4 ++++
>>  1 file changed, 4 insertions(+)
>> 
>> diff --git a/drivers/input/serio/i8042-sparcio.h b/drivers/input/serio/i8042-sparcio.h
>> index fce76812843b..a2a9db9220d7 100644
>> --- a/drivers/input/serio/i8042-sparcio.h
>> +++ b/drivers/input/serio/i8042-sparcio.h
>> @@ -108,6 +108,8 @@ static int __init i8042_platform_init(void)
>>  	struct device_node *root = of_find_node_by_path("/");
>>  	const char *name = of_get_property(root, "name", NULL);
>>  
>> +	of_node_put(root);
>> +
>>  	if (name && !strcmp(name, "SUNW,JavaStation-1")) {
>>  		/* Hardcoded values for MrCoffee.  */
>>  		i8042_kbd_irq = i8042_aux_irq = 13 | 0x20;
>> @@ -139,6 +141,8 @@ static inline void i8042_platform_exit(void)
>>  	struct device_node *root = of_find_node_by_path("/");
>>  	const char *name = of_get_property(root, "name", NULL);
>>  
>> +	of_node_put(root);
>> +
>>  	if (!name || strcmp(name, "SUNW,JavaStation-1"))
>>  		platform_driver_unregister(&sparc_i8042_driver);
>>  }
>
>There already was an attempt to fix this issue in a slightly better way,
>unfortunately the original author did not finish the work:
>
>https://lore.kernel.org/all/20181212163548.23723-1-tiny.windzz@gmail.com/
>
>Thanks.
>
>-- 
>Dmitry

Hi, Dmirtry,

Thanks for reviewing my patch code.

The Li's patch adds a helper and is better than mine.

Thanks again,

Liang