Merge branch 'drm-nouveau-fixes-3.8' of git://anongit.freedesktop.org/git/nouveau/linux-2.6 into drm-next

Fixes for one major lockdep warning, one oops reported by a few people, and
fix for a long hang on some gpu engines.

* 'drm-nouveau-fixes-3.8' of git://anongit.freedesktop.org/git/nouveau/linux-2.6:
  drm/nouveau: add lockdep annotations
  drm/nv50/fb: Fix nullptr-deref on IGPs
  drm/nouveau: use different register to wait for secret scrubber

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

@@ -73,8 +73,11 @@ _nouveau_falcon_init(struct nouveau_object *object)
 	nv_debug(falcon, "data limit: %d\n", falcon->data.limit);
 
 	/* wait for 'uc halted' to be signalled before continuing */
-	if (falcon->secret) {
-		nv_wait(falcon, 0x008, 0x00000010, 0x00000010);
+	if (falcon->secret && falcon->version < 4) {
+		if (!falcon->version)
+			nv_wait(falcon, 0x008, 0x00000010, 0x00000010);
+		else
+			nv_wait(falcon, 0x180, 0x80000000, 0);
 		nv_wo32(falcon, 0x004, 0x00000010);
 	}
 

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

@@ -99,7 +99,7 @@ nouveau_subdev_create_(struct nouveau_object *parent,
 	if (ret)
 		return ret;
 
-	mutex_init(&subdev->mutex);
+	__mutex_init(&subdev->mutex, subname, &oclass->lock_class_key);
 	subdev->name = subname;
 
 	if (parent) {

drivers/gpu/drm/nouveau/core/include/core/object.h

@@ -50,10 +50,13 @@ int  nouveau_object_fini(struct nouveau_object *, bool suspend);
 
 extern struct nouveau_ofuncs nouveau_object_ofuncs;
 
+/* Don't allocate dynamically, because lockdep needs lock_class_keys to be in
+ * ".data". */
 struct nouveau_oclass {
 	u32 handle;
-	struct nouveau_ofuncs *ofuncs;
-	struct nouveau_omthds *omthds;
+	struct nouveau_ofuncs * const ofuncs;
+	struct nouveau_omthds * const omthds;
+	struct lock_class_key lock_class_key;
 };
 
 #define nv_oclass(o)    nv_object(o)->oclass

drivers/gpu/drm/nouveau/core/subdev/fb/base.c

@@ -86,8 +86,8 @@ nouveau_fb_preinit(struct nouveau_fb *pfb)
 			return ret;
 	}
 
-	if (!nouveau_mm_initialised(&pfb->tags) && tags) {
-		ret = nouveau_mm_init(&pfb->tags, 0, ++tags, 1);
+	if (!nouveau_mm_initialised(&pfb->tags)) {
+		ret = nouveau_mm_init(&pfb->tags, 0, tags ? ++tags : 0, 1);
 		if (ret)
 			return ret;
 	}

drivers/gpu/drm/nouveau/core/subdev/fb/nv50.c

@@ -99,7 +99,7 @@ nv50_fb_vram_init(struct nouveau_fb *pfb)
 	struct nouveau_bios *bios = nouveau_bios(device);
 	const u32 rsvd_head = ( 256 * 1024) >> 12; /* vga memory */
 	const u32 rsvd_tail = (1024 * 1024) >> 12; /* vbios etc */
-	u32 size;
+	u32 size, tags = 0;
 	int ret;
 
 	pfb->ram.size = nv_rd32(pfb, 0x10020c);
@@ -140,10 +140,11 @@ nv50_fb_vram_init(struct nouveau_fb *pfb)
 			return ret;
 
 		pfb->ram.ranks = (nv_rd32(pfb, 0x100200) & 0x4) ? 2 : 1;
+		tags = nv_rd32(pfb, 0x100320);
 		break;
 	}
 
-	return nv_rd32(pfb, 0x100320);
+	return tags;
 }
 
 static int

drivers/gpu/drm/nouveau/nouveau_drm.c

@@ -245,6 +245,8 @@ static int nouveau_drm_probe(struct pci_dev *pdev,
 	return 0;
 }
 
+static struct lock_class_key drm_client_lock_class_key;
+
 static int
 nouveau_drm_load(struct drm_device *dev, unsigned long flags)
 {
@@ -256,6 +258,7 @@ nouveau_drm_load(struct drm_device *dev, unsigned long flags)
 	ret = nouveau_cli_create(pdev, "DRM", sizeof(*drm), (void**)&drm);
 	if (ret)
 		return ret;
+	lockdep_set_class(&drm->client.mutex, &drm_client_lock_class_key);
 
 	dev->dev_private = drm;
 	drm->dev = dev;