linux-kernel - Re: [PATCH v2] drivers: hwmon: fix ioremap and memremap leak

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Date:   Tue, 21 Mar 2023 07:52:51 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Tianyi Jing <jingfelix@...t.edu.cn>
Cc:     Jean Delvare <jdelvare@...e.com>, Dongliang Mu <dzm91@...t.edu.cn>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers: hwmon: fix ioremap and memremap leak

On Sat, Mar 18, 2023 at 10:38:51PM +0800, Tianyi Jing wrote:
> Smatch reports:
> 
> drivers/hwmon/xgene-hwmon.c:757 xgene_hwmon_probe() warn:
> 'ctx->pcc_comm_addr' from ioremap() not released on line: 757.
> 
> This is because in drivers/hwmon/xgene-hwmon.c:701 xgene_hwmon_probe(),
> ioremap and memremap is not released, which may cause a leak.
> 
> To fix this, ioremap and memremap is modified to devm_ioremap and
> devm_memremap.
> 
> Signed-off-by: Tianyi Jing <jingfelix@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>

Applied. Note that I updated the subject and changed formatting a bit.

Guenter

> ---
> v1 -> v2: use devm_ioremap and devm_memremap instead.
>  drivers/hwmon/xgene-hwmon.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hwmon/xgene-hwmon.c b/drivers/hwmon/xgene-hwmon.c
> index 5cde837bfd09..a25fae9b19b7 100644
> --- a/drivers/hwmon/xgene-hwmon.c
> +++ b/drivers/hwmon/xgene-hwmon.c
> @@ -698,11 +698,13 @@ static int xgene_hwmon_probe(struct platform_device *pdev)
>  		ctx->comm_base_addr = pcc_chan->shmem_base_addr;
>  		if (ctx->comm_base_addr) {
>  			if (version == XGENE_HWMON_V2)
> -				ctx->pcc_comm_addr = (void __force *)ioremap(
> +				ctx->pcc_comm_addr = (void __force *)devm_ioremap(
> +							&pdev->dev,
>  							ctx->comm_base_addr,
>  							pcc_chan->shmem_size);
>  			else
> -				ctx->pcc_comm_addr = memremap(
> +				ctx->pcc_comm_addr = devm_memremap(
> +							&pdev->dev,
>  							ctx->comm_base_addr,
>  							pcc_chan->shmem_size,
>  							MEMREMAP_WB);