linux-kernel - Re: [PATCH] mtd: onenand: Check for error irq

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Message-ID: <20220103165620.2eadfc4c@xps13>
Date:   Mon, 3 Jan 2022 16:56:20 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     kyungmin.park@...sung.com, richard@....at, vigneshr@...com,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: onenand: Check for error irq

Hi Jiasheng,

jiasheng@...as.ac.cn wrote on Fri, 24 Dec 2021 10:23:21 +0800:

> For the possible failure of the platform_get_irq(), the returned irq
> could be error number and will finally cause the failure of the
> request_irq().
> Consider that platform_get_irq() can now in certain cases return
> -EPROBE_DEFER, and the consequences of letting request_irq() effectively
> convert that into -EINVAL, even at probe time rather than later on.
> So it might be better to check just now.
> 
> Fixes: 26777d37216c ("mtd: Move onenand code base to drivers/mtd/nand/onenand")

This is not the root cause.

> Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
> ---
>  drivers/mtd/nand/onenand/generic.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/onenand/generic.c b/drivers/mtd/nand/onenand/generic.c
> index 8b6f4da5d720..a4b8b65fe15f 100644
> --- a/drivers/mtd/nand/onenand/generic.c
> +++ b/drivers/mtd/nand/onenand/generic.c
> @@ -53,7 +53,12 @@ static int generic_onenand_probe(struct platform_device *pdev)
>  	}
>  
>  	info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;
> -	info->onenand.irq = platform_get_irq(pdev, 0);
> +
> +	err = platform_get_irq(pdev, 0);
> +	if (err < 0)
> +		goto out_iounmap;
> +
> +	info->onenand.irq = err;
>  
>  	info->mtd.dev.parent = &pdev->dev;
>  	info->mtd.priv = &info->onenand;

Otherwise looks fine.

Thanks,
Miquèl