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drm/msm/gem: Convert to lockdep assert

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Utilize the power of lockdep for our GEM locking related sanity
checking.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/496139/
Link: https://lore.kernel.org/r/20220802155152.1727594-16-robdclark@gmail.com
This commit is contained in:
Rob Clark
2022-08-02 08:51:48 -07:00
parent d4d7d3630d
commit d95c196ddb
1 changed files with 6 additions and 9 deletions
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15
drivers/gpu/drm/msm/msm_gem.h
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@@ -197,8 +197,8 @@ msm_gem_unlock(struct drm_gem_object *obj)
dma_resv_unlock(obj->resv);
}
static inline bool
msm_gem_is_locked(struct drm_gem_object *obj)
static inline void
msm_gem_assert_locked(struct drm_gem_object *obj)
{
/*
* Destroying the object is a special case.. msm_gem_free_object()
@@ -212,13 +212,10 @@ msm_gem_is_locked(struct drm_gem_object *obj)
* Unfortunately lockdep is not aware of this detail. So when the
* refcount drops to zero, we pretend it is already locked.
*/
return dma_resv_is_locked(obj->resv) || (kref_read(&obj->refcount) == 0);
}
static inline void
msm_gem_assert_locked(struct drm_gem_object *obj)
{
GEM_WARN_ON(!msm_gem_is_locked(obj));
lockdep_assert_once(
(kref_read(&obj->refcount) == 0) ||
(lockdep_is_held(&obj->resv->lock.base) != LOCK_STATE_NOT_HELD)
);
}
/* imported/exported objects are not purgeable: */