mm/iob/iob_notifier.c: Don't check iob_navail in iob_notifier_setup to avoid a potential race condition.

include/nuttx/mm/iob.h

@@ -272,30 +272,6 @@ int iob_notifier_setup(int qid, worker_t worker, FAR void *arg);
 int iob_notifier_teardown(int key);
 #endif
 
-/****************************************************************************
- * Name: iob_notifier_signal
- *
- * Description:
- *   An IOB has become available.  Signal all threads waiting for an IOB
- *   that an IOB is available.
- *
- *   When an IOB becomes available, *all* of the workers waiting for an
- *   IOB will be executed.  If there are multiple workers for waiting an IOB
- *   then only the first to execute will get the IOB.  Others will
- *   need to call iob_notify_setup() once again.
- *
- * Input Parameters:
- *   None.
- *
- * Returned Value:
- *   None.
- *
- ****************************************************************************/
-
-#ifdef CONFIG_IOB_NOTIFIER
-void iob_notifier_signal(void);
-#endif
-
 /****************************************************************************
  * Name: iob_free_chain
  *

mm/iob/iob_notifier.c

@@ -84,19 +84,6 @@ int iob_notifier_setup(int qid, worker_t worker, FAR void *arg)
 
   DEBUGASSERT(worker != NULL);
 
-  /* If there are already free IOBs, then return zero without setting up the
-   * notification.
-   *
-   * REVISIT: The 'throttled' argument should not always be 'false'.
-   */
-
-  if (iob_navail(false) > 0)
-    {
-      return 0;
-    }
-
-  /* Otherwise, this is just a simple wrapper around work_notifer_setup(). */
-
   info.evtype    = WORK_IOB_AVAIL;
   info.qid       = qid;
   info.qualifier = NULL;