linux-kernel - Re: [PATCH] i2c: qup: Add missing unwind goto in qup_i2c

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Date:   Sat, 10 Jun 2023 12:54:34 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Shuai Jiang <d202180596@...t.edu.cn>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Wolfram Sang <wsa@...nel.org>,
        "Ivan T. Ivanov" <iivanov@...sol.com>,
        Sricharan R <sricharan@...eaurora.org>,
        Naveen Kaje <nkaje@...eaurora.org>,
        Austin Christ <austinwc@...eaurora.org>,
        hust-os-kernel-patches@...glegroups.com,
        Andy Gross <agross@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: qup: Add missing unwind goto in qup_i2c_probe()

On Tue, Apr 18, 2023 at 09:56:12PM +0800, Shuai Jiang wrote:
> Smatch Warns:
> 	drivers/i2c/busses/i2c-qup.c:1784 qup_i2c_probe()
> 	warn: missing unwind goto?
> 
> The goto label "fail_runtime" and "fail" will disable qup->pclk, 
> but here qup->pclk failed to obtain, in order to be consistent, 
> change the direct return to goto label "fail_dma".
> 
> Fixes: 10c5a8425968 ("i2c: qup: New bus driver for the Qualcomm QUP I2C controller")
> Fixes: 515da746983b ("i2c: qup: add ACPI support")

These are not the correct Fixes, the correct fix is:

Fixes: 9cedf3b2f099 ("i2c: qup: Add bam dma capabilities")

> Signed-off-by: Shuai Jiang <d202180596@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>

and

Cc: <stable@...r.kernel.org> # v4.6+

Patch looks good:

Reviewed-by: Andi Shyti <andi.shyti@...nel.org> 

Andi

> ---
> The issue is found by static analysis and remains untested.
> ---
>  drivers/i2c/busses/i2c-qup.c | 21 ++++++++++++++-------
>  1 file changed, 14 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
> index 2e153f2f71b6..78682388e02e 100644
> --- a/drivers/i2c/busses/i2c-qup.c
> +++ b/drivers/i2c/busses/i2c-qup.c
> @@ -1752,16 +1752,21 @@ static int qup_i2c_probe(struct platform_device *pdev)
>  	if (!clk_freq || clk_freq > I2C_MAX_FAST_MODE_PLUS_FREQ) {
>  		dev_err(qup->dev, "clock frequency not supported %d\n",
>  			clk_freq);
> -		return -EINVAL;
> +		ret = -EINVAL;
> +		goto fail_dma;
>  	}
>  
>  	qup->base = devm_platform_ioremap_resource(pdev, 0);
> -	if (IS_ERR(qup->base))
> -		return PTR_ERR(qup->base);
> +	if (IS_ERR(qup->base)) {
> +		ret = PTR_ERR(qup->base);
> +		goto fail_dma;
> +	}
>  
>  	qup->irq = platform_get_irq(pdev, 0);
> -	if (qup->irq < 0)
> -		return qup->irq;
> +	if (qup->irq < 0) {
> +		ret = qup->irq;
> +		goto fail_dma;
> +	}
>  
>  	if (has_acpi_companion(qup->dev)) {
>  		ret = device_property_read_u32(qup->dev,
> @@ -1775,13 +1780,15 @@ static int qup_i2c_probe(struct platform_device *pdev)
>  		qup->clk = devm_clk_get(qup->dev, "core");
>  		if (IS_ERR(qup->clk)) {
>  			dev_err(qup->dev, "Could not get core clock\n");
> -			return PTR_ERR(qup->clk);
> +			ret = PTR_ERR(qup->clk);
> +			goto fail_dma;
>  		}
>  
>  		qup->pclk = devm_clk_get(qup->dev, "iface");
>  		if (IS_ERR(qup->pclk)) {
>  			dev_err(qup->dev, "Could not get iface clock\n");
> -			return PTR_ERR(qup->pclk);
> +			ret = PTR_ERR(qup->pclk);
> +			goto fail_dma;
>  		}
>  		qup_i2c_enable_clocks(qup);
>  		src_clk_freq = clk_get_rate(qup->clk);
> -- 
> 2.25.1
>