padata: Check for valid padata instance on start
This patch introduces the PADATA_INVALID flag which is
checked on padata start. This will be used to mark a padata
instance as invalid, if the padata cpumask does not intersect
with the active cpumask. we change padata_start to return an
error if the PADATA_INVALID is set. Also we adapt the only
padata user, pcrypt to this change.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/kernel/padata.c b/kernel/padata.c
index ff8de1b..e7d723a 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -485,6 +485,11 @@
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 @@
*
* @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);