wimax: oops: wimax_dev_add() is the only one that can initialize the state

[safe/jmp/linux-2.6] / net / wimax / stack.c

diff --git a/net/wimax/stack.c b/net/wimax/stack.c
index a0ee76b..933e142 100644 (file)
--- 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);
 }