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drm/gem: Check locking in drm_gem_object_unreference

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Pretty soon only some drivers will need dev->struct_mutex in their
gem_free_object callbacks. Hence it's really important to make sure
everything still keeps getting this right.

v2: Don't check for locking before we check for non-NULL obj. Spotted
by Dan Carpenter.

Link: http://mid.gmane.org/1444894601-5200-10-git-send-email-daniel.vetter@ffwll.ch
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2015-10-15 09:36:25 +02:00
parent 4e270f0880
commit ef4c6270bf
1 changed files with 4 additions and 1 deletions
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5
include/drm/drm_gem.h
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@ -142,8 +142,11 @@ drm_gem_object_reference(struct drm_gem_object *obj)
static inline void
drm_gem_object_unreference(struct drm_gem_object *obj)
{
if (obj != NULL)
if (obj != NULL) {
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
kref_put(&obj->refcount, drm_gem_object_free);
}
}
static inline void