linux-kernel - Re: [PATCH v2] drivers: loongson: fix memory leak in loongson2_guts

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Date:   Mon, 6 Mar 2023 11:20:05 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     WANG Xuerui <kernel@...0n.name>
Cc:     Yinbo Zhu <zhuyinbo@...ngson.cn>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers: loongson: fix memory leak in
 loongson2_guts_probe


> On Mar 6, 2023, at 11:03, WANG Xuerui <kernel@...0n.name> wrote:
> 
> On 2023/3/6 10:53, Dongliang Mu wrote:
>> drivers/soc/loongson/loongson2_guts.c:150 loongson2_guts_probe()
>> warn: 'guts->regs' from ioremap() not released on lines: 131,135,139,143.
>> Fix this by modifying ioremap to devm_ioremap.
>> Note that, this patch is not tested due to the loongson architecture.
>> Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
>> ---
>> v1->v2: instead of modifying error handling code, directly change
>> ioremap to devm_ioremap.
>>  drivers/soc/loongson/loongson2_guts.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> diff --git a/drivers/soc/loongson/loongson2_guts.c b/drivers/soc/loongson/loongson2_guts.c
>> index bace4bc8e03b..a053e3fdae09 100644
>> --- a/drivers/soc/loongson/loongson2_guts.c
>> +++ b/drivers/soc/loongson/loongson2_guts.c
>> @@ -107,7 +107,7 @@ static int loongson2_guts_probe(struct platform_device *pdev)
>>  	guts->little_endian = of_property_read_bool(np, "little-endian");
>>    	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	guts->regs = ioremap(res->start, res->end - res->start + 1);
>> +	guts->regs = devm_ioremap(dev, res->start, res->end - res->start + 1);
> 
> resource_size(res) is exactly "res->end - res->start + 1", you may use that to simplify code now that you touched this line.

I will send a v3 patch since this is a good suggestion.

> 
>>  	if (IS_ERR(guts->regs))
>>  		return PTR_ERR(guts->regs);
>>  
> 
> Otherwise LGTM, thanks! Untested by me though,
> 
> Reviewed-by: WANG Xuerui <git@...0n.name>
> 
> -- 
> WANG "xen0n" Xuerui
> 
> Linux/LoongArch mailing list: https://lore.kernel.org/loongarch/