powerpc/pseries: Improve error code on reconfiguration notifier failure

Reconfiguration notifier call for device node may fail by several reasons,
but it always assumes kmalloc failures.

This enables reconfiguration notifier call chain to get the actual error
code rather than -ENOMEM by converting all reconfiguration notifier calls
to return encapsulate error code with notifier_from_errno().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 3 insertions, 7 deletions

diff --git a/arch/powerpc/platforms/pseries/hotplug-cpu.c b/arch/powerpc/platforms/pseries/hotplug-cpu.c
index 46f13a3c5d09..bc0288501f17 100644
--- a/arch/powerpc/platforms/pseries/hotplug-cpu.c
+++ b/arch/powerpc/platforms/pseries/hotplug-cpu.c
@@ -330,21 +330,17 @@ static void pseries_remove_processor(struct device_node *np)
 static int pseries_smp_notifier(struct notifier_block *nb,
                                 unsigned long action, void *node)
 {
-        int err = NOTIFY_OK;
+        int err = 0;
 
         switch (action) {
         case PSERIES_RECONFIG_ADD:
-                if (pseries_add_processor(node))
-                        err = NOTIFY_BAD;
+                err = pseries_add_processor(node);
                 break;
         case PSERIES_RECONFIG_REMOVE:
                 pseries_remove_processor(node);
                 break;
-        default:
-                err = NOTIFY_DONE;
-                break;
         }
-        return err;
+        return notifier_from_errno(err);
 }
 
 static struct notifier_block pseries_smp_nb = {