From 330b8abd83d4af378953af708cc10ddf3a5877fd Mon Sep 17 00:00:00 2001 From: Marcin Slusarz Date: Mon, 4 Feb 2013 21:52:54 +0100 Subject: drm/nouveau: add lockdep annotations commit 5f97ab913cf0fbc378ea8ffc3ee66f4890d11c55 upstream. 1) Lockdep thinks all nouveau subdevs belong to the same class and can be locked in arbitrary order, which is not true (at least in general case). Tell it to distinguish subdevs by (o)class type. 2) DRM client can be locked under user client lock - tell lockdep to put DRM client lock in a separate class. Reported-by: Arend van Spriel Reported-by: Peter Hurley Reported-by: Maarten Lankhorst Reported-by: Daniel J Blueman Signed-off-by: Marcin Slusarz Signed-off-by: Ben Skeggs Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/nouveau/core/core/subdev.c | 2 +- drivers/gpu/drm/nouveau/core/include/core/object.h | 7 +++++-- drivers/gpu/drm/nouveau/nouveau_drm.c | 3 +++ 3 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/nouveau/core/core/subdev.c b/drivers/gpu/drm/nouveau/core/core/subdev.c index f74c30aa33a0..48f06378d3f9 100644 --- a/drivers/gpu/drm/nouveau/core/core/subdev.c +++ b/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) { diff --git a/drivers/gpu/drm/nouveau/core/include/core/object.h b/drivers/gpu/drm/nouveau/core/include/core/object.h index 486f1a9217fd..727ba4f87bf1 100644 --- a/drivers/gpu/drm/nouveau/core/include/core/object.h +++ b/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 * ofuncs; + struct nouveau_omthds * const omthds; + struct lock_class_key lock_class_key; }; #define nv_oclass(o) nv_object(o)->oclass diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c index 8503b2ea570a..572c216afe54 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drm.c +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c @@ -241,6 +241,8 @@ nouveau_drm_probe(struct pci_dev *pdev, const struct pci_device_id *pent) return 0; } +static struct lock_class_key drm_client_lock_class_key; + static int nouveau_drm_load(struct drm_device *dev, unsigned long flags) { @@ -252,6 +254,7 @@ 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; -- cgit v1.2.3