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

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Date:   Sat, 18 Mar 2023 05:31:24 -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] drivers: hwmon: fix ioremap and memremap leak

On Sat, Mar 18, 2023 at 07:27:11PM +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, iounmap and memunmap is added to line: 754. And the
> declaration of 'version' is moved to xgene-hwmon.c:620 to help simplify
> getting 'version' below.
> 
> Signed-off-by: Tianyi Jing <jingfelix@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>

Please just use devm_ioremap() and devm_memremap().

Thanks,
Guenter