linux-kernel - Re: [PATCH] i2c: bcm2835: Fix error handling in bcm2835_i2c

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Date:   Sat, 21 May 2022 13:46:15 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Annaliese McDermond <nh6z@...z.net>, linux-i2c@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: bcm2835: Fix error handling in bcm2835_i2c_probe

On Sun, Apr 03, 2022 at 06:33:08AM +0000, Miaoqian Lin wrote:
> In the error handling path, the clk_prepare_enable() function
> call should be balanced by a corresponding 'clk_disable_unprepare()'
> call. And clk_set_rate_exclusive calls clk_rate_exclusive_get(),
> it should be balanced with call to clk_rate_exclusive_put().
> , as already done in the remove function.
> 
> Fixes: bebff81fb8b9 ("i2c: bcm2835: Model Divider in CCF")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Looking for a reviewer here, pretty please?

> ---
>  drivers/i2c/busses/i2c-bcm2835.c | 21 ++++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
> index 5149454eef4a..d794448866a7 100644
> --- a/drivers/i2c/busses/i2c-bcm2835.c
> +++ b/drivers/i2c/busses/i2c-bcm2835.c
> @@ -454,18 +454,21 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
>  	ret = clk_prepare_enable(i2c_dev->bus_clk);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Couldn't prepare clock");
> -		return ret;
> +		goto err_put_clk;
>  	}
>  
>  	i2c_dev->irq = platform_get_irq(pdev, 0);
> -	if (i2c_dev->irq < 0)
> -		return i2c_dev->irq;
> +	if (i2c_dev->irq < 0) {
> +		ret =  i2c_dev->irq;
> +		goto err_disable_clk;
> +	}
>  
>  	ret = request_irq(i2c_dev->irq, bcm2835_i2c_isr, IRQF_SHARED,
>  			  dev_name(&pdev->dev), i2c_dev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Could not request IRQ\n");
> -		return -ENODEV;
> +		ret = -ENODEV;
> +		goto err_disable_clk;
>  	}
>  
>  	adap = &i2c_dev->adapter;
> @@ -489,8 +492,16 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
>  
>  	ret = i2c_add_adapter(adap);
>  	if (ret)
> -		free_irq(i2c_dev->irq, i2c_dev);
> +		goto err_free_irq;
> +
> +	return ret;
>  
> +err_free_irq:
> +	free_irq(i2c_dev->irq, i2c_dev);
> +err_disable_clk:
> +	clk_disable_unprepare(i2c_dev->bus_clk);
> +err_put_clk:
> +	clk_rate_exclusive_put(i2c_dev->bus_clk);
>  	return ret;
>  }
>  
> -- 
> 2.17.1
> 

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