diff options
| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2013-08-06 09:59:46 +0100 |
|---|---|---|
| committer |   Dave Airlie <airlied@redhat.com> | 2013-08-07 10:07:17 +1000 |
| commit | 7fc65eb731cda8304865669166fb9a4c519bee69 (patch) | |
| tree | eeeff7e07e01ccdef46a1f2b6c82c9624f53acb0 /include/drm/drmP.h | |
| parent | drm/gem: create drm_gem_dumb_destroy (diff) | |
| download | linux-dev-7fc65eb731cda8304865669166fb9a4c519bee69.tar.xz linux-dev-7fc65eb731cda8304865669166fb9a4c519bee69.zip | |
drm: Apply kref_put_mutex() optimisations to drm_gem_object_unreference_unlocked()
We can apply the same optimisation tricks as kref_put_mutex() in our
local equivalent function. However, we have a different locking semantic
(we unlock ourselves, in kref_put_mutex() the callee unlocks) so that we
can use the same callbacks for both locked and unlocked kref_put()s and
so can not simply convert to using kref_put_mutex() directly.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm/drmP.h')
| -rw-r--r-- | include/drm/drmP.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h index a029dea13f48..3b7fda557b8d 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1629,10 +1629,12 @@ drm_gem_object_unreference(struct drm_gem_object *obj) static inline void drm_gem_object_unreference_unlocked(struct drm_gem_object *obj) { - if (obj != NULL) { + if (obj && !atomic_add_unless(&obj->refcount.refcount, -1, 1)) { struct drm_device *dev = obj->dev; + mutex_lock(&dev->struct_mutex); - kref_put(&obj->refcount, drm_gem_object_free); + if (likely(atomic_dec_and_test(&obj->refcount.refcount))) + drm_gem_object_free(&obj->refcount); mutex_unlock(&dev->struct_mutex); } } |