linux-kernel - Re: [PATCH v3] i2c: ocores: add missing unwind goto in `ocores_i2c

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Message-ID: <310e91c6.439bc.187b7f784f3.Coremail.m202171703@hust.edu.cn>
Date:   Tue, 25 Apr 2023 18:31:04 +0800 (GMT+08:00)
From:   张网 <m202171703@...t.edu.cn>
To:     "Peter Korsgaard" <peter@...sgaard.com>,
        "Andrew Lunn" <andrew@...n.ch>
Cc:     hust-os-kernel-patches@...glegroups.com, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] i2c: ocores: add missing unwind goto in
 `ocores_i2c_probe`

I'm sorry for sending the error ping message. 
The related patch has fixed the issue by changing the ocores_i2c_of_probe function to use devm_clk_get_optional_enabled(). 
This new patch only requires a minor modification, and there is no need to add a check for clk_disable_unprepare 
as it already has checks for error pointers and NULL values.

Best regards,
Wang Zhang

"Wang Zhang" <silver_code@...t.edu.cn>写道：
> Smatch Warns:
> drivers/i2c/busses/i2c-ocores.c:701 ocores_i2c_probe() warn:
> missing unwind goto?
> 
> The error handling code after the err_clk label should be executed to
> release any resources that were allocated for the clock if a negative
> error code returned after platform_get_irq_optional.
> 
> Fix this by changing the direct return to `goto err_clk`. 
> 
> Signed-off-by: Wang Zhang <silver_code@...t.edu.cn>
> ---
> v2->v3: the first patch had issues. Just do a much simpler fix. No need 
> to add the check. clk_disable_unprepare() has checks for error pointer 
> and NULL already.
> v1->v2: change `ocores_i2c_of_probe` to use `devm_clk_get_enabled()`
> ---
> This patch was found by static analyzer.
> ...
>  drivers/i2c/busses/i2c-ocores.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
> index 2e575856c5cd..1df1439218c9 100644
> --- a/drivers/i2c/busses/i2c-ocores.c
> +++ b/drivers/i2c/busses/i2c-ocores.c
> @@ -700,8 +700,10 @@ static int ocores_i2c_probe(struct platform_device *pdev)
>  	if (irq == -ENXIO) {
>  		ocores_algorithm.master_xfer = ocores_xfer_polling;
>  	} else {
> -		if (irq < 0)
> -			return irq;
> +		if (irq < 0) {
> +			ret = irq;
> +			goto err_clk;
> +		}
>  	}
>  
>  	if (ocores_algorithm.master_xfer != ocores_xfer_polling) {
> -- 
> 2.34.1