linux-kernel - Re: [PATCH] i2c: omap: Fix rumtime PM imbalance on error

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Message-ID: <YG1Mw89UGIuuIp80@atomide.com>
Date:   Wed, 7 Apr 2021 09:10:11 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Vignesh R <vigneshr@...com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: omap: Fix rumtime PM imbalance on error

* Dinghao Liu <dinghao.liu@....edu.cn> [210407 03:31]:
> pm_runtime_get_sync() will increase the rumtime PM counter
> even it returns an error. Thus a pairing decrement is needed
> to prevent refcount leak. Fix this by replacing this API with
> pm_runtime_resume_and_get(), which will not change the runtime
> PM counter on error.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>

Reviewed-by: Tony Lindgren <tony@...mide.com>

> ---
>  drivers/i2c/busses/i2c-omap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index 12ac4212aded..c9ee0875a79d 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;
>  
> -- 
> 2.17.1
>