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

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Message-ID: <b9a04f64-90a6-8915-2b96-2805d8117459@xen0n.name>
Date:   Mon, 6 Mar 2023 11:03:49 +0800
From:   WANG Xuerui <kernel@...0n.name>
To:     Dongliang Mu <dzm91@...t.edu.cn>, Yinbo Zhu <zhuyinbo@...ngson.cn>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers: loongson: fix memory leak in
 loongson2_guts_probe

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.

>   	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/