padata: Check for valid padata instance on start

[mv-sheeva.git] / kernel / padata.c

diff --git a/kernel/padata.c b/kernel/padata.c
index ff8de1b71e4eb1174e0aa857d1bcb09ca34dd13c..e7d723a3e31d456816cbf78bca00e851ef7ee37b 100644 (file)
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -485,6 +485,11 @@ static void padata_flush_queues(struct parallel_data *pd)
        BUG_ON(atomic_read(&pd->refcnt) != 0);
 }
 
+static void __padata_start(struct padata_instance *pinst)
+{
+       pinst->flags |= PADATA_INIT;
+}
+
 /* Replace the internal control stucture with a new one. */
 static void padata_replace(struct padata_instance *pinst,
                           struct parallel_data *pd_new)
@@ -619,11 +624,20 @@ EXPORT_SYMBOL(padata_remove_cpu);
  *
  * @pinst: padata instance to start
  */
-void padata_start(struct padata_instance *pinst)
+int padata_start(struct padata_instance *pinst)
 {
+       int err = 0;
+
        mutex_lock(&pinst->lock);
-       pinst->flags |= PADATA_INIT;
+
+       if (pinst->flags & PADATA_INVALID)
+               err =-EINVAL;
+
+        __padata_start(pinst);
+
        mutex_unlock(&pinst->lock);
+
+       return err;
 }
 EXPORT_SYMBOL(padata_start);