linux-kernel - Re: [PATCH v2 3/3] iio: adc: meson_saradc: Use temporary variable for struct device

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Message-ID: <ad3af033-97f1-3aad-d082-c6ed56185b59@metafoo.de>
Date:   Thu, 2 Jun 2022 13:53:53 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH v2 3/3] iio: adc: meson_saradc: Use temporary variable for
 struct device

On 6/2/22 13:42, Andy Shevchenko wrote:
return -ENOMEM;
>   
> @@ -690,7 +687,7 @@ static int meson_sar_adc_clk_init(struct iio_dev *indio_dev,
>   	priv->clk_gate.bit_idx = __ffs(MESON_SAR_ADC_REG3_CLK_EN);
>   	priv->clk_gate.hw.init = &init;
>   
> -	priv->adc_clk = devm_clk_register(&indio_dev->dev, &priv->clk_gate.hw);
> +	priv->adc_clk = devm_clk_register(idev, &priv->clk_gate.hw);

You are not changing anything here. But we shouldn't be devm'ing on the 
IIO device. It will get freed eventually, but only when the last 
reference to the iio device has been dropped, which might be long after 
the platform device has been removed. devm'ing should happen on the 
platform_device's device. Might be worth fixing.

>   	if (WARN_ON(IS_ERR(priv->adc_clk)))
>   		return PTR_ERR(priv->adc_clk);
>   
> @@ -706,8 +703,7 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
>   	size_t read_len;
>