linux-kernel - Re: [PATCH ] /drivers/ata ioremap returncode check

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Date:	Wed, 22 Aug 2007 11:11:18 -0700
From:	Brandon Philips <brandon@...p.org>
To:	postfail@...hmail.com
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH ] /drivers/ata ioremap returncode check

On 20:31 Mon 13 Aug 2007, Scott Thompson wrote:
> patchset against 2.6.23-rc3.  corrects missing ioremap return checks.
> 
> Warning -- cleanup handler here may miss additional required cleanup as has occurred on other
> portions of ioremap audit.
> 
> This patch had been submitted previously but hushmail client caused wordwrap issues, resending
> with different mail client.
> 
> Signed-off-by: Scott Thompson <postfail <at> hushmail.com>
> ----------------------------------------------------------
> 
> diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c
> index 4ca7fd6..eaebc4d 100644
> --- a/drivers/ata/pata_ixp4xx_cf.c
> +++ b/drivers/ata/pata_ixp4xx_cf.c
> @@ -189,6 +189,14 @@ static __devinit int ixp4xx_pata_probe(struct platform_device *pdev)
>  	data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
>  	data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
>  
> +	if (!data->cs0 || !data->cs1) {
> +		if (data->cs0)
> +			iounmap(data->cs0);
> +		if (data->cs1)
> +			iounmap(data->cs1);
> +		return -ENOMEM;
> +	}
> +
>  	irq = platform_get_irq(pdev, 0);
>  	if (irq)
>  		set_irq_type(irq, IRQT_RISING);

The iounmap calls are unnecessary since devm_ioremap will un-allocate
the space if you return an error from probe.  See
Documentation/driver-model/devres.txt

But, something like this is needed.

+	if (!data->cs0 || !data->cs1)
+		return -ENOMEM;

Thanks,

	Brandon
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