linux-kernel - Re: [PATCH 2/2] xen: Add alias to autoload backend drivers

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Message-ID: <20110627161327.GO6978@dumpdata.com>
Date:	Mon, 27 Jun 2011 12:13:27 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Bastian Blank <waldi@...ian.org>, xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] xen: Add alias to autoload backend drivers

On Fri, Jun 24, 2011 at 11:51:55PM +0200, Bastian Blank wrote:
> All the Xen backend drivers are assigned to a special bus type
> xen-backend. This allows userspace to load the modules on request.

Is there a specific version of udev that would take advantage of this?

> 
> This patch defines xen-backend:* aliases on the modules and exports this
> names through modalias and uevent.
> 
> Signed-off-by: Bastian Blank <waldi@...ian.org>
> ---
>  drivers/block/xen-blkback/blkback.c       |    1 +
>  drivers/net/xen-netback/netback.c         |    1 +
>  drivers/xen/xenbus/xenbus_probe.c         |    3 ++-
>  drivers/xen/xenbus/xenbus_probe_backend.c |    3 +++
>  4 files changed, 7 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
> index 5cf2993..ed62008 100644
> --- a/drivers/block/xen-blkback/blkback.c
> +++ b/drivers/block/xen-blkback/blkback.c
> @@ -824,3 +824,4 @@ static int __init xen_blkif_init(void)
>  module_init(xen_blkif_init);
>  
>  MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_ALIAS("xen-backend:vbd");
> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
> index 0e4851b..fd00f25 100644
> --- a/drivers/net/xen-netback/netback.c
> +++ b/drivers/net/xen-netback/netback.c
> @@ -1743,3 +1743,4 @@ failed_init:
>  module_init(netback_init);
>  
>  MODULE_LICENSE("Dual BSD/GPL");
> +MODULE_ALIAS("xen-backend:vif");
> diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
> index 2ed0b04..bd2f90c 100644
> --- a/drivers/xen/xenbus/xenbus_probe.c
> +++ b/drivers/xen/xenbus/xenbus_probe.c
> @@ -393,7 +393,8 @@ static ssize_t devtype_show(struct device *dev,
>  static ssize_t modalias_show(struct device *dev,
>  			     struct device_attribute *attr, char *buf)
>  {
> -	return sprintf(buf, "xen:%s\n", to_xenbus_device(dev)->devicetype);
> +	return sprintf(buf, "%s:%s\n", dev->bus->name,
> +		       to_xenbus_device(dev)->devicetype);
>  }
>  
>  struct device_attribute xenbus_dev_attrs[] = {
> diff --git a/drivers/xen/xenbus/xenbus_probe_backend.c b/drivers/xen/xenbus/xenbus_probe_backend.c
> index ec510e5..60adf91 100644
> --- a/drivers/xen/xenbus/xenbus_probe_backend.c
> +++ b/drivers/xen/xenbus/xenbus_probe_backend.c
> @@ -107,6 +107,9 @@ static int xenbus_uevent_backend(struct device *dev,
>  	if (xdev == NULL)
>  		return -ENODEV;
>  
> +	if (add_uevent_var(env, "MODALIAS=xen-backend:%s", xdev->devicetype))
> +		return -ENOMEM;
> +
>  	/* stuff we want to pass to /sbin/hotplug */
>  	if (add_uevent_var(env, "XENBUS_TYPE=%s", xdev->devicetype))
>  		return -ENOMEM;
> -- 
> 1.7.5.4
> 
> --
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