linux-kernel - Re: [PATCH -next] i2c: omap: fix PM reference leak in omap_i2c

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Message-ID: <4b9bdf6e-f6f0-6971-0761-e7255e1355da@ti.com>
Date:   Sat, 10 Apr 2021 12:30:12 +0530
From:   Vignesh Raghavendra <vigneshr@...com>
To:     Li Huafei <lihuafei1@...wei.com>, <tony@...mide.com>,
        <aaro.koskinen@....fi>
CC:     <linux-omap@...r.kernel.org>, <linux-i2c@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yangjihong1@...wei.com>,
        <zhangjinhao2@...wei.com>, <--lihuafei1@...wei.com>
Subject: Re: [PATCH -next] i2c: omap: fix PM reference leak in
 omap_i2c_probe()

Hi.

On 4/8/21 6:26 PM, Li Huafei wrote:
> pm_runtime_get_sync will increment pm usage counter even it failed.
> Forgetting to putting operation will result in reference leak here. Fix
> it by replacing it with pm_runtime_resume_and_get to keep usage counter
> balanced.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Li Huafei <lihuafei1@...wei.com>
> ---
>  drivers/i2c/busses/i2c-omap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 12ac4212aded..edbe498d49b8 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -1404,7 +1404,7 @@ omap_i2c_probe(struct platform_device *pdev)
>  	pm_runtime_set_autosuspend_delay(omap->dev, OMAP_I2C_PM_TIMEOUT);
>  	pm_runtime_use_autosuspend(omap->dev);
>  
> -	r = pm_runtime_get_sync(omap->dev);
> +	r = pm_runtime_resume_and_get(omap->dev);
>  	if (r < 0)
>  		goto err_free_mem;
>  
> @@ -1525,7 +1525,7 @@ static int omap_i2c_remove(struct platform_device *pdev)
>  	int ret;
>  
>  	i2c_del_adapter(&omap->adapter);
> -	ret = pm_runtime_get_sync(&pdev->dev);
> +	ret = pm_runtime_resume_and_get(&pdev->dev);
>  	if (ret < 0)
>  		return ret;
>  
> 
There is a similar patch at: lore.kernel.org/r/20210407033030.13419-1-dinghao.liu@....edu.cn
But seems like this patch is better as it fixes module remove path as well.
Would appreciate if you could work with author of above patch and come up
with a single patch.

Could you add stable tag and repost given that pm_runtime_resume_and_get()
API is backported to stable kernels such as v5.4?

Regards
Vignesh