linux-kernel - Re: [PATCH v3 3/5] soc: mediatek: pwrap: Move and check return value of platform_get

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Date:   Tue, 17 May 2022 11:18:55 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        nfraprado@...labora.com, rex-bc.chen@...iatek.com,
        zhiyong.tao@...iatek.com
Subject: Re: [PATCH v3 3/5] soc: mediatek: pwrap: Move and check return value
 of platform_get_irq()



On 16/05/2022 14:46, AngeloGioacchino Del Regno wrote:
> Move the call to platform_get_irq() earlier in the probe function
> and check for its return value: if no interrupt is specified, it
> wouldn't make sense to try to call devm_request_irq() so, in that
> case, we can simply return early.
> 
> Moving the platform_get_irq() call also makes it possible to use
> one less goto, as clocks aren't required at that stage.
> 
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> Tested-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> ---
>   drivers/soc/mediatek/mtk-pmic-wrap.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c
> index 852514366f1f..332cbcabc299 100644
> --- a/drivers/soc/mediatek/mtk-pmic-wrap.c
> +++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
> @@ -2204,6 +2204,10 @@ static int pwrap_probe(struct platform_device *pdev)
>   	if (!wrp)
>   		return -ENOMEM;
>   
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0)
> +		return irq;
> +
>   	platform_set_drvdata(pdev, wrp);
>   
>   	wrp->master = of_device_get_match_data(&pdev->dev);
> @@ -2316,7 +2320,6 @@ static int pwrap_probe(struct platform_device *pdev)
>   	if (HAS_CAP(wrp->master->caps, PWRAP_CAP_INT1_EN))
>   		pwrap_writel(wrp, wrp->master->int1_en_all, PWRAP_INT1_EN);
>   
> -	irq = platform_get_irq(pdev, 0);

For better readability of the code I'd prefer to keep platform_get_irq next to 
devm_request_irq. I understand that you did this change so that you don't have 
to code
if (irq < 0) {
     ret = irq;
     goto err_out2;
}

Or do I miss something?

Regards,
Matthias

>   	ret = devm_request_irq(wrp->dev, irq, pwrap_interrupt,
>   			       IRQF_TRIGGER_HIGH,
>   			       "mt-pmic-pwrap", wrp);