linux-kernel - Re: [PATCH v2] iio: adc: mxs-lradc: fix the order of two cleanup operations

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Message-ID: <20230416132906.4ec56e47@jic23-huawei>
Date:   Sun, 16 Apr 2023 13:29:06 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Jiakai Luo <jkluo@...t.edu.cn>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Ksenija Stanojevic <ksenija.stanojevic@...il.com>,
        Lee Jones <lee.jones@...aro.org>, Marek Vasut <marex@...x.de>,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: adc: mxs-lradc: fix the order of two cleanup
 operations

On Sun, 16 Apr 2023 00:21:57 -0700
Jiakai Luo <jkluo@...t.edu.cn> wrote:

> Smatch reports:
> drivers/iio/adc/mxs-lradc-adc.c:766 mxs_lradc_adc_probe() warn:
> missing unwind goto?
> 
> the order of three init operation:
> 1.mxs_lradc_adc_trigger_init
> 2.iio_triggered_buffer_setup
> 3.mxs_lradc_adc_hw_init
> 
> thus, the order of three cleanup operation should be:
> 1.mxs_lradc_adc_hw_stop
> 2.iio_triggered_buffer_cleanup
> 3.mxs_lradc_adc_trigger_remove
> 
> we exchange the order of two cleanup operations,
> introducing the following differences:
> 1.if mxs_lradc_adc_trigger_init fails, returns directly;
> 2.if trigger_init succeeds but iio_triggered_buffer_setup fails,
> goto err_trig and remove the trigger.
> 
> v1->v2: exchange the order of mxs_lradc_adc_trigger_remove()
> and iio_triggered_buffer_cleanup() in error handling labels
Move your change log to after the --- marking below.

We don't want to retain that level of detail in the commit logs in the
git tree.

Thanks,

Jonathan

> 
> Fixes: 6dd112b9f85e ("iio: adc: mxs-lradc: Add support for ADC driver")
> Signed-off-by: Jiakai Luo <jkluo@...t.edu.cn>
> Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
> ---
>  drivers/iio/adc/mxs-lradc-adc.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/adc/mxs-lradc-adc.c b/drivers/iio/adc/mxs-lradc-adc.c
> index bca79a93cbe4..d32e9b1d03ce 100644
> --- a/drivers/iio/adc/mxs-lradc-adc.c
> +++ b/drivers/iio/adc/mxs-lradc-adc.c
> @@ -757,13 +757,13 @@ static int mxs_lradc_adc_probe(struct platform_device *pdev)
>  
>  	ret = mxs_lradc_adc_trigger_init(iio);
>  	if (ret)
> -		goto err_trig;
> +		return ret;
>  
>  	ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
>  					 &mxs_lradc_adc_trigger_handler,
>  					 &mxs_lradc_adc_buffer_ops);
>  	if (ret)
> -		return ret;
> +		goto err_trig;
>  
>  	adc->vref_mv = mxs_lradc_adc_vref_mv[lradc->soc];
>  
> @@ -801,9 +801,9 @@ static int mxs_lradc_adc_probe(struct platform_device *pdev)
>  
>  err_dev:
>  	mxs_lradc_adc_hw_stop(adc);
> -	mxs_lradc_adc_trigger_remove(iio);
> -err_trig:
>  	iio_triggered_buffer_cleanup(iio);
> +err_trig:
> +	mxs_lradc_adc_trigger_remove(iio);
>  	return ret;
>  }
>