Merge ../linux-2.6-watchdog-mm

[pandora-kernel.git] / lib / kobject_uevent.c

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7f20e7b..84272ed 100644 (file)
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -50,18 +50,25 @@ static char *action_to_string(enum kobject_action action)
                return "offline";
        case KOBJ_ONLINE:
                return "online";
+       case KOBJ_MOVE:
+               return "move";
        default:
                return NULL;
        }
 }
 
 /**
- * kobject_uevent - notify userspace by ending an uevent
+ * kobject_uevent_env - send an uevent with environmental data
  *
- * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE)
+ * @action: action that is happening (usually KOBJ_MOVE)
  * @kobj: struct kobject that the action is happening to
+ * @envp_ext: pointer to environmental data
+ *
+ * Returns 0 if kobject_uevent() is completed with success or the
+ * corresponding error when it fails.
  */
-void kobject_uevent(struct kobject *kobj, enum kobject_action action)
+int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
+                       char *envp_ext[])
 {
        char **envp;
        char *buffer;
@@ -75,13 +82,16 @@ void kobject_uevent(struct kobject *kobj, enum kobject_action action)
        u64 seq;
        char *seq_buff;
        int i = 0;
-       int retval;
+       int retval = 0;
+       int j;
 
        pr_debug("%s\n", __FUNCTION__);
 
        action_string = action_to_string(action);
-       if (!action_string)
-               return;
+       if (!action_string) {
+               pr_debug("kobject attempted to send uevent without action_string!\n");
+               return -EINVAL;
+       }
 
        /* search the kset we belong to */
        top_kobj = kobj;
@@ -90,31 +100,39 @@ void kobject_uevent(struct kobject *kobj, enum kobject_action action)
                        top_kobj = top_kobj->parent;
                } while (!top_kobj->kset && top_kobj->parent);
        }
-       if (!top_kobj->kset)
-               return;
+       if (!top_kobj->kset) {
+               pr_debug("kobject attempted to send uevent without kset!\n");
+               return -EINVAL;
+       }
 
        kset = top_kobj->kset;
        uevent_ops = kset->uevent_ops;
 
        /*  skip the event, if the filter returns zero. */
        if (uevent_ops && uevent_ops->filter)
-               if (!uevent_ops->filter(kset, kobj))
-                       return;
+               if (!uevent_ops->filter(kset, kobj)) {
+                       pr_debug("kobject filter function caused the event to drop!\n");
+                       return 0;
+               }
 
        /* environment index */
        envp = kzalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL);
        if (!envp)
-               return;
+               return -ENOMEM;
 
        /* environment values */
        buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
-       if (!buffer)
+       if (!buffer) {
+               retval = -ENOMEM;
                goto exit;
+       }
 
        /* complete object path */
        devpath = kobject_get_path(kobj, GFP_KERNEL);
-       if (!devpath)
+       if (!devpath) {
+               retval = -ENOENT;
                goto exit;
+       }
 
        /* originating subsystem */
        if (uevent_ops && uevent_ops->name)
@@ -134,7 +152,8 @@ void kobject_uevent(struct kobject *kobj, enum kobject_action action)
        scratch += sprintf (scratch, "DEVPATH=%s", devpath) + 1;
        envp [i++] = scratch;
        scratch += sprintf(scratch, "SUBSYSTEM=%s", subsystem) + 1;
-
+       for (j = 0; envp_ext && envp_ext[j]; j++)
+               envp[i++] = envp_ext[j];
        /* just reserve the space, overwrite it after kset call has returned */
        envp[i++] = seq_buff = scratch;
        scratch += strlen("SEQNUM=18446744073709551616") + 1;
@@ -198,8 +217,25 @@ exit:
        kfree(devpath);
        kfree(buffer);
        kfree(envp);
-       return;
+       return retval;
+}
+
+EXPORT_SYMBOL_GPL(kobject_uevent_env);
+
+/**
+ * kobject_uevent - notify userspace by ending an uevent
+ *
+ * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE)
+ * @kobj: struct kobject that the action is happening to
+ *
+ * Returns 0 if kobject_uevent() is completed with success or the
+ * corresponding error when it fails.
+ */
+int kobject_uevent(struct kobject *kobj, enum kobject_action action)
+{
+       return kobject_uevent_env(kobj, action, NULL);
 }
+
 EXPORT_SYMBOL_GPL(kobject_uevent);
 
 /**