Driver core: notify userspace of network device renames (ca2f37db) · Commits · 戴 / test

lib/kobject.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -311,13 +311,43 @@ EXPORT_SYMBOL(kobject_set_name);
		int kobject_rename(struct kobject * kobj, const char *new_name)
		{
		int error = 0;
		const char *devpath = NULL;
		char *devpath_string = NULL;
		char *envp[2];

		kobj = kobject_get(kobj);
		if (!kobj)
		return -EINVAL;
		if (!kobj->parent)
		return -EINVAL;

		devpath = kobject_get_path(kobj, GFP_KERNEL);
		if (!devpath) {
		error = -ENOMEM;
		goto out;
		}
		devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
		if (!devpath_string) {
		error = -ENOMEM;
		goto out;
		}
		sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
		envp[0] = devpath_string;
		envp[1] = NULL;
		/* Note : if we want to send the new name alone, not the full path,
		* we could probably use kobject_name(kobj); */

		error = sysfs_rename_dir(kobj, kobj->parent->dentry, new_name);

		/* This function is mostly/only used for network interface.
		* Some hotplug package track interfaces by their name and
		* therefore want to know when the name is changed by the user. */
		if (!error)
		kobject_uevent_env(kobj, KOBJ_MOVE, envp);

		out:
		kfree(devpath_string);
		kfree(devpath);
		kobject_put(kobj);

		return error;

+11 −0

Original line number	Diff line number	Diff line
		@@ -421,6 +421,17 @@ static int netdev_uevent(struct device d, char *envp,
		buf += n;
		size -= n;

		if ((size <= 0) \|\| (i >= num_envp))
		return -ENOMEM;

		/* pass ifindex to uevent.
		* ifindex is useful as it won't change (interface name may change)
		* and is what RtNetlink uses natively. */
		envp[i++] = buf;
		n = snprintf(buf, size, "IFINDEX=%d", dev->ifindex) + 1;
		buf += n;
		size -= n;

		if ((size <= 0) \|\| (i >= num_envp))
		return -ENOMEM;