X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fplugin.c;h=5d882e64de7e69f47b47c53eeb7e63e4adea1045;hb=be99a844a40d7037a910d37a894988b807631a6e;hp=b150cf673ef75302d02a489991a11bcf3985f184;hpb=1e4db580e37d235755de0c4a4c08ba7a6ac7bb4c;p=collectd.git

diff --git a/src/plugin.c b/src/plugin.c
index b150cf67..5d882e64 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -888,6 +888,14 @@ int plugin_unregister_read (const char *name) /* {{{ */
 	}
 
 	le = llist_search (read_list, name);
+	if (le == NULL)
+	{
+		pthread_mutex_unlock (&read_lock);
+		WARNING ("plugin_unregister_read: No such read function: %s",
+				name);
+		return (-ENOENT);
+	}
+
 	llist_remove (read_list, le);
 
 	rf = le->value;
@@ -1205,8 +1213,14 @@ void plugin_shutdown_all (void)
 		(*callback) ();
 	}
 
-	destroy_all_callbacks (&list_write);
+	/* Write plugins which use the `user_data' pointer usually need the
+	 * same data available to the flush callback. If this is the case, set
+	 * the free_function to NULL when registering the flush callback and to
+	 * the real free function when registering the write callback. This way
+	 * the data isn't freed twice. */
 	destroy_all_callbacks (&list_flush);
+	destroy_all_callbacks (&list_write);
+
 	destroy_all_callbacks (&list_notification);
 	destroy_all_callbacks (&list_shutdown);
 	destroy_all_callbacks (&list_log);