- * @signal: signal name
- * @obj: object path (kobject)
- * @envp: possible hotplug environment to pass with the message
- * @gfp_mask:
- */
-static int send_uevent(const char *signal, const char *obj,
- char **envp, gfp_t gfp_mask)
-{
- struct sk_buff *skb;
- char *pos;
- int len;
-
- if (!uevent_sock)
- return -EIO;
-
- len = strlen(signal) + 1;
- len += strlen(obj) + 1;
-
- /* allocate buffer with the maximum possible message size */
- skb = alloc_skb(len + BUFFER_SIZE, gfp_mask);
- if (!skb)
- return -ENOMEM;
-
- pos = skb_put(skb, len);
- sprintf(pos, "%s@%s", signal, obj);
-
- /* copy the environment key by key to our continuous buffer */
- if (envp) {
- int i;
-
- for (i = 2; envp[i]; i++) {
- len = strlen(envp[i]) + 1;
- pos = skb_put(skb, len);
- strcpy(pos, envp[i]);
- }
- }
-
- NETLINK_CB(skb).dst_group = 1;
- return netlink_broadcast(uevent_sock, skb, 0, 1, gfp_mask);
-}
-
-static int do_kobject_uevent(struct kobject *kobj, enum kobject_action action,
- struct attribute *attr, gfp_t gfp_mask)
-{
- char *path;
- char *attrpath;
- char *signal;
- int len;
- int rc = -ENOMEM;
-
- path = kobject_get_path(kobj, gfp_mask);
- if (!path)
- return -ENOMEM;
-
- signal = action_to_string(action);
- if (!signal)
- return -EINVAL;
-
- if (attr) {
- len = strlen(path);
- len += strlen(attr->name) + 2;
- attrpath = kmalloc(len, gfp_mask);
- if (!attrpath)
- goto exit;
- sprintf(attrpath, "%s/%s", path, attr->name);
- rc = send_uevent(signal, attrpath, NULL, gfp_mask);
- kfree(attrpath);
- } else
- rc = send_uevent(signal, path, NULL, gfp_mask);
-
-exit:
- kfree(path);
- return rc;
-}
-
-/**
- * kobject_uevent - notify userspace by sending event through netlink socket
- *
- * @signal: signal name
- * @kobj: struct kobject that the event is happening to
- * @attr: optional struct attribute the event belongs to
- */
-int kobject_uevent(struct kobject *kobj, enum kobject_action action,
- struct attribute *attr)
-{
- return do_kobject_uevent(kobj, action, attr, GFP_KERNEL);
-}
-EXPORT_SYMBOL_GPL(kobject_uevent);
-
-int kobject_uevent_atomic(struct kobject *kobj, enum kobject_action action,
- struct attribute *attr)
-{
- return do_kobject_uevent(kobj, action, attr, GFP_ATOMIC);
-}
-EXPORT_SYMBOL_GPL(kobject_uevent_atomic);
-
-static int __init kobject_uevent_init(void)
-{
- uevent_sock = netlink_kernel_create(NETLINK_KOBJECT_UEVENT, 1, NULL,
- THIS_MODULE);
-
- if (!uevent_sock) {
- printk(KERN_ERR
- "kobject_uevent: unable to create netlink socket!\n");
- return -ENODEV;
- }
-
- return 0;
-}
-
-postcore_initcall(kobject_uevent_init);
-
-#else
-static inline int send_uevent(const char *signal, const char *obj,
- char **envp, int gfp_mask)
-{
- return 0;
-}
-
-#endif /* CONFIG_KOBJECT_UEVENT */
-
-
-#ifdef CONFIG_HOTPLUG
-char hotplug_path[HOTPLUG_PATH_LEN] = "/sbin/hotplug";
-u64 hotplug_seqnum;
-static DEFINE_SPINLOCK(sequence_lock);
-
-/**
- * kobject_hotplug - notify userspace by executing /sbin/hotplug
- *
- * @action: action that is happening (usually "ADD" or "REMOVE")