[PATCH 3/4] Provide VIO modalias

[David Woodhouse]

On Fri, 2010-02-05 at 08:53 -0500, Josh Boyer wrote:
> Provide a modalias entry for VIO devices in sysfs.  I believe
> this was another initrd generation bugfix for anaconda.
> 
> ---

Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>

Not entirely sure why this didn't get upstream when I first did it;
maybe I just posted it once and then forgot about it?

> diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
> index f988672..12a0851 100644
> --- a/arch/powerpc/kernel/vio.c
> +++ b/arch/powerpc/kernel/vio.c
> @@ -294,9 +294,27 @@ static ssize_t devspec_show(struct device *dev,
>  	return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
>  }
>  
> +static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
> +			     char *buf)
> +{
> +	const struct vio_dev *vio_dev = to_vio_dev(dev);
> +	struct device_node *dn;
> +	const char *cp;
> +
> +	dn = dev->archdata.of_node;
> +	if (!dn)
> +		return -ENODEV;
> +	cp = of_get_property(dn, "compatible", NULL);
> +	if (!cp)
> +		return -ENODEV;
> +
> +	return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp);
> +}
> +
>  static struct device_attribute vio_dev_attrs[] = {
>  	__ATTR_RO(name),
>  	__ATTR_RO(devspec),
> +	__ATTR_RO(modalias),
>  	__ATTR_NULL
>  };
> 
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-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse at intel.com                              Intel Corporation