Re: [PATCH -next v2 2/3] iio: adc: at91_adc: Use devm_request_irq() helper function

From: Jonathan Cameron <jic23@kernel.org>
To: Jinjie Ruan <ruanjinjie@huawei.com>
Cc: <lars@metafoo.de>, <nicolas.ferre@microchip.com>,
	<alexandre.belloni@bootlin.com>, <claudiu.beznea@tuxon.dev>,
	<yangyingliang@huawei.com>, <robh@kernel.org>, <heiko@sntech.de>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-iio@vger.kernel.org>
Subject: Re: [PATCH -next v2 2/3] iio: adc: at91_adc: Use devm_request_irq() helper function
Date: Sun, 27 Aug 2023 18:13:17 +0100	[thread overview]
Message-ID: <20230827181317.10ea9aa7@jic23-huawei> (raw)
In-Reply-To: <20230826022922.3457054-3-ruanjinjie@huawei.com>

On Sat, 26 Aug 2023 10:29:21 +0800
Jinjie Ruan <ruanjinjie@huawei.com> wrote:

> Use devm_request_irq() to request the interrupt, so we can
> avoid having to manually clean this up.
> 
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
> ---
>  drivers/iio/adc/at91_adc.c | 28 +++++++++++++---------------
>  1 file changed, 13 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
> index 318e33ce22fb..2ac1b64f0fb7 100644
> --- a/drivers/iio/adc/at91_adc.c
> +++ b/drivers/iio/adc/at91_adc.c
> @@ -1077,11 +1077,13 @@ static int at91_adc_probe(struct platform_device *pdev)
>  	at91_adc_writel(st, AT91_ADC_IDR, 0xFFFFFFFF);
>  
>  	if (st->caps->has_tsmr)
> -		ret = request_irq(st->irq, at91_adc_9x5_interrupt, 0,
> -				  pdev->dev.driver->name, idev);
> +		ret = devm_request_irq(&pdev->dev, st->irq,
> +				       at91_adc_9x5_interrupt, 0,
> +				       pdev->dev.driver->name, idev);
>  	else
> -		ret = request_irq(st->irq, at91_adc_rl_interrupt, 0,
> -				  pdev->dev.driver->name, idev);
> +		ret = devm_request_irq(&pdev->dev, st->irq,
> +				       at91_adc_rl_interrupt, 0,
> +				       pdev->dev.driver->name, idev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "Failed to allocate IRQ.\n");
>  		return ret;
> @@ -1092,7 +1094,7 @@ static int at91_adc_probe(struct platform_device *pdev)
>  		dev_err(&pdev->dev,
>  			"Could not prepare or enable the clock.\n");
>  		ret = PTR_ERR(st->clk);
> -		goto error_free_irq;
> +		return ret;
Whilst they go away in the next patch, this does look odd as you can clearly just
do
		return PTR_ERR(st->clk);

In the interests of easy step wise patch review, I'd prefer that you made that
change in this patch in all the places this pattern occurs.

>  	}
>  
>  	st->adc_clk = devm_clk_get_enabled(&pdev->dev, "adc_op_clk");
> @@ -1100,7 +1102,7 @@ static int at91_adc_probe(struct platform_device *pdev)
>  		dev_err(&pdev->dev,
>  			"Could not prepare or enable the ADC clock.\n");
>  		ret = PTR_ERR(st->adc_clk);
> -		goto error_free_irq;
> +		return ret;
>  	}
>  
>  	/*
> @@ -1119,8 +1121,7 @@ static int at91_adc_probe(struct platform_device *pdev)
>  
>  	if (!st->startup_time) {
>  		dev_err(&pdev->dev, "No startup time available.\n");
> -		ret = -EINVAL;
> -		goto error_free_irq;
> +		return -EINVAL;
>  	}
>  	ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz);
>  
> @@ -1148,7 +1149,7 @@ static int at91_adc_probe(struct platform_device *pdev)
>  	ret = at91_adc_channel_init(idev);
>  	if (ret < 0) {
>  		dev_err(&pdev->dev, "Couldn't initialize the channels.\n");
> -		goto error_free_irq;
> +		return ret;
>  	}
>  
>  	init_waitqueue_head(&st->wq_data_avail);
> @@ -1163,19 +1164,19 @@ static int at91_adc_probe(struct platform_device *pdev)
>  		ret = at91_adc_buffer_init(idev);
>  		if (ret < 0) {
>  			dev_err(&pdev->dev, "Couldn't initialize the buffer.\n");
> -			goto error_free_irq;
> +			return ret;
>  		}
>  
>  		ret = at91_adc_trigger_init(idev);
>  		if (ret < 0) {
>  			dev_err(&pdev->dev, "Couldn't setup the triggers.\n");
>  			at91_adc_buffer_remove(idev);
> -			goto error_free_irq;
> +			return ret;
>  		}
>  	} else {
>  		ret = at91_ts_register(idev, pdev);
>  		if (ret)
> -			goto error_free_irq;
> +			return ret;
>  
>  		at91_ts_hw_init(idev, adc_clk_khz);
>  	}
> @@ -1195,8 +1196,6 @@ static int at91_adc_probe(struct platform_device *pdev)
>  	} else {
>  		at91_ts_unregister(st);
>  	}
> -error_free_irq:
> -	free_irq(st->irq, idev);
>  	return ret;
>  }
>  
> @@ -1212,7 +1211,6 @@ static int at91_adc_remove(struct platform_device *pdev)
>  	} else {
>  		at91_ts_unregister(st);
>  	}
> -	free_irq(st->irq, idev);
>  
>  	return 0;
>  }