From 102b49da15834c1d2ba508457fdf69b3d07c6fee Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Thu, 20 Aug 2015 14:54:15 +1000
Subject: [PATCH] drm/nouveau/parent: remove some (now) unnecessary
 special-case handling

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
---
 .../drm/nouveau/include/nvkm/core/parent.h    |  8 +--
 drivers/gpu/drm/nouveau/nvkm/core/parent.c    | 55 +++++--------------
 2 files changed, 14 insertions(+), 49 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/core/parent.h b/drivers/gpu/drm/nouveau/include/nvkm/core/parent.h
index 57932131b601..2e5266fa7584 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/core/parent.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/core/parent.h
@@ -2,16 +2,10 @@
 #define __NVKM_PARENT_H__
 #include <core/object.h>
 
-struct nvkm_sclass {
-	struct nvkm_sclass *sclass;
-	struct nvkm_engine *engine;
-	struct nvkm_oclass *oclass;
-};
-
 struct nvkm_parent {
 	struct nvkm_object object;
 
-	struct nvkm_sclass *sclass;
+	struct nvkm_oclass *sclass;
 	u64 engine;
 
 	int  (*context_attach)(struct nvkm_object *, struct nvkm_object *);
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/parent.c b/drivers/gpu/drm/nouveau/nvkm/core/parent.c
index dd56cd1eeb38..5c75c64f2270 100644
--- a/drivers/gpu/drm/nouveau/nvkm/core/parent.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/parent.c
@@ -30,35 +30,27 @@ nvkm_parent_sclass(struct nvkm_object *parent, u16 handle,
 		   struct nvkm_object **pengine,
 		   struct nvkm_oclass **poclass)
 {
-	struct nvkm_sclass *sclass;
+	struct nvkm_oclass *sclass, *oclass;
 	struct nvkm_engine *engine;
-	struct nvkm_oclass *oclass;
 	u64 mask;
+	int i;
 
 	sclass = nv_parent(parent)->sclass;
-	while (sclass) {
-		if ((sclass->oclass->handle & 0xffff) == handle) {
+	while ((oclass = sclass++) && oclass->ofuncs) {
+		if (oclass->handle == handle) {
 			*pengine = &parent->engine->subdev.object;
-			*poclass = sclass->oclass;
+			*poclass = oclass;
 			return 0;
 		}
-
-		sclass = sclass->sclass;
 	}
 
 	mask = nv_parent(parent)->engine;
-	while (mask) {
-		int i = __ffs64(mask);
-
-		if (nv_iclass(parent, NV_CLIENT_CLASS))
-			engine = nv_engine(nv_client(parent)->device);
-		else
-			engine = nvkm_engine(parent, i);
-
+	while (i = __ffs64(mask), mask) {
+		engine = nvkm_engine(parent, i);
 		if (engine) {
 			oclass = engine->sclass;
 			while (oclass->ofuncs) {
-				if ((oclass->handle & 0xffff) == handle) {
+				if (oclass->handle == handle) {
 					*pengine = nv_object(engine);
 					*poclass = oclass;
 					return 0;
@@ -76,17 +68,15 @@ nvkm_parent_sclass(struct nvkm_object *parent, u16 handle,
 int
 nvkm_parent_lclass(struct nvkm_object *parent, u32 *lclass, int size)
 {
-	struct nvkm_sclass *sclass;
+	struct nvkm_oclass *sclass, *oclass;
 	struct nvkm_engine *engine;
-	struct nvkm_oclass *oclass;
 	int nr = -1, i;
 	u64 mask;
 
 	sclass = nv_parent(parent)->sclass;
-	while (sclass) {
+	while ((oclass = sclass++) && oclass->ofuncs) {
 		if (++nr < size)
-			lclass[nr] = sclass->oclass->handle & 0xffff;
-		sclass = sclass->sclass;
+			lclass[nr] = oclass->handle;
 	}
 
 	mask = nv_parent(parent)->engine;
@@ -95,7 +85,7 @@ nvkm_parent_lclass(struct nvkm_object *parent, u32 *lclass, int size)
 		if (engine && (oclass = engine->sclass)) {
 			while (oclass->ofuncs) {
 				if (++nr < size)
-					lclass[nr] = oclass->handle & 0xffff;
+					lclass[nr] = oclass->handle;
 				oclass++;
 			}
 		}
@@ -113,7 +103,6 @@ nvkm_parent_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 		    int size, void **pobject)
 {
 	struct nvkm_parent *object;
-	struct nvkm_sclass *nclass;
 	int ret;
 
 	ret = nvkm_object_create_(parent, engine, oclass, pclass |
@@ -122,18 +111,7 @@ nvkm_parent_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 	if (ret)
 		return ret;
 
-	while (sclass && sclass->ofuncs) {
-		nclass = kzalloc(sizeof(*nclass), GFP_KERNEL);
-		if (!nclass)
-			return -ENOMEM;
-
-		nclass->sclass = object->sclass;
-		object->sclass = nclass;
-		nclass->engine = engine ? nv_engine(engine) : NULL;
-		nclass->oclass = sclass;
-		sclass++;
-	}
-
+	object->sclass = sclass;
 	object->engine = engcls;
 	return 0;
 }
@@ -141,13 +119,6 @@ nvkm_parent_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 void
 nvkm_parent_destroy(struct nvkm_parent *parent)
 {
-	struct nvkm_sclass *sclass;
-
-	while ((sclass = parent->sclass)) {
-		parent->sclass = sclass->sclass;
-		kfree(sclass);
-	}
-
 	nvkm_object_destroy(&parent->object);
 }