drm/nouveau/core: Move event index check from critical section

The index_nr field is constant for the lifetime of the event, so
serialized access is unnecessary.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/core/event.c

@@ -40,8 +40,10 @@ nouveau_event_put(struct nouveau_event *event, int index,
 {
 	unsigned long flags;
 
+	if (index >= event->index_nr)
+		return;
+
 	spin_lock_irqsave(&event->lock, flags);
-	if (index < event->index_nr)
 	nouveau_event_put_locked(event, index, handler);
 	spin_unlock_irqrestore(&event->lock, flags);
 }
@@ -52,14 +54,15 @@ nouveau_event_get(struct nouveau_event *event, int index,
 {
 	unsigned long flags;
 
+	if (index >= event->index_nr)
+		return;
+
 	spin_lock_irqsave(&event->lock, flags);
-	if (index < event->index_nr) {
 	list_add(&handler->head, &event->index[index].list);
 	if (!event->index[index].refs++) {
 		if (event->enable)
 			event->enable(event, index);
 	}
-	}
 	spin_unlock_irqrestore(&event->lock, flags);
 }