1 files changed, 15 insertions, 2 deletions

diff --git a/net/wimax/stack.c b/net/wimax/stack.c
index a0ee76b52510..933e1422b09f 100644
--- a/net/wimax/stack.c
+++ b/net/wimax/stack.c
@@ -338,8 +338,21 @@ out:
  */
 void wimax_state_change(struct wimax_dev *wimax_dev, enum wimax_st new_state)
 {
+        /*
+         * A driver cannot take the wimax_dev out of the
+         * __WIMAX_ST_NULL state unless by calling wimax_dev_add(). If
+         * the wimax_dev's state is still NULL, we ignore any request
+         * to change its state because it means it hasn't been yet
+         * registered.
+         *
+         * There is no need to complain about it, as routines that
+         * call this might be shared from different code paths that
+         * are called before or after wimax_dev_add() has done its
+         * job.
+         */
         mutex_lock(&wimax_dev->mutex);
-        __wimax_state_change(wimax_dev, new_state);
+        if (wimax_dev->state > __WIMAX_ST_NULL)
+                __wimax_state_change(wimax_dev, new_state);
         mutex_unlock(&wimax_dev->mutex);
         return;
 }
@@ -376,7 +389,7 @@ EXPORT_SYMBOL_GPL(wimax_state_get);
 void wimax_dev_init(struct wimax_dev *wimax_dev)
 {
         INIT_LIST_HEAD(&wimax_dev->id_table_node);
-        __wimax_state_set(wimax_dev, WIMAX_ST_UNINITIALIZED);
+        __wimax_state_set(wimax_dev, __WIMAX_ST_NULL);
         mutex_init(&wimax_dev->mutex);
         mutex_init(&wimax_dev->mutex_reset);
 }