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Subject[PATCH 16 of 24] xen: Module autoprobing support for frontend drivers
Date
From
From: Mark McLoughlin <markmc@redhat.com>

Add module aliases to support autoprobing modules
for xen frontend devices.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
---
drivers/block/xen-blkfront.c | 1 +
drivers/net/xen-netfront.c | 1 +
drivers/xen/xenbus/xenbus_probe.c | 28 +++++++++++++++++++++++++---
3 files changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1015,3 +1015,4 @@
MODULE_DESCRIPTION("Xen virtual block device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(XENVBD_MAJOR);
+MODULE_ALIAS("xen:vbd");
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1809,3 +1809,4 @@

MODULE_DESCRIPTION("Xen virtual network device frontend");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("xen:vif");
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -88,6 +88,16 @@
return match_device(drv->ids, to_xenbus_device(_dev)) != NULL;
}

+static int xenbus_uevent(struct device *_dev, struct kobj_uevent_env *env)
+{
+ struct xenbus_device *dev = to_xenbus_device(_dev);
+
+ if (add_uevent_var(env, "MODALIAS=xen:%s", dev->devicetype))
+ return -ENOMEM;
+
+ return 0;
+}
+
/* device/<type>/<id> => <type>-<id> */
static int frontend_bus_id(char bus_id[BUS_ID_SIZE], const char *nodename)
{
@@ -166,6 +176,7 @@
.bus = {
.name = "xen",
.match = xenbus_match,
+ .uevent = xenbus_uevent,
.probe = xenbus_dev_probe,
.remove = xenbus_dev_remove,
.shutdown = xenbus_dev_shutdown,
@@ -438,6 +449,12 @@
}
DEVICE_ATTR(devtype, S_IRUSR | S_IRGRP | S_IROTH, xendev_show_devtype, NULL);

+static ssize_t xendev_show_modalias(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "xen:%s\n", to_xenbus_device(dev)->devicetype);
+}
+DEVICE_ATTR(modalias, S_IRUSR | S_IRGRP | S_IROTH, xendev_show_modalias, NULL);

int xenbus_probe_node(struct xen_bus_type *bus,
const char *type,
@@ -492,10 +509,16 @@

err = device_create_file(&xendev->dev, &dev_attr_devtype);
if (err)
- goto fail_remove_file;
+ goto fail_remove_nodename;
+
+ err = device_create_file(&xendev->dev, &dev_attr_modalias);
+ if (err)
+ goto fail_remove_devtype;

return 0;
-fail_remove_file:
+fail_remove_devtype:
+ device_remove_file(&xendev->dev, &dev_attr_devtype);
+fail_remove_nodename:
device_remove_file(&xendev->dev, &dev_attr_nodename);
fail_unregister:
device_unregister(&xendev->dev);



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