drm: introduce drm_gem_object_[handle_]unreference_unlocked
This patch introduces the drm_gem_object_unreference_unlocked
and drm_gem_object_handle_unreference_unlocked functions that
do not require holding struct_mutex.
drm_gem_object_unreference_unlocked calls the new
->gem_free_object_unlocked entry point if available, and
otherwise just takes struct_mutex and just calls ->gem_free_object
Signed-off-by: Luca Barbieri <luca@luca-barbieri.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 8bf3770..4018b3b 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -411,8 +411,19 @@
mutex_unlock(&dev->struct_mutex);
}
+static void
+drm_gem_object_free_common(struct drm_gem_object *obj)
+{
+ struct drm_device *dev = obj->dev;
+ fput(obj->filp);
+ atomic_dec(&dev->object_count);
+ atomic_sub(obj->size, &dev->object_memory);
+ kfree(obj);
+}
+
/**
* Called after the last reference to the object has been lost.
+ * Must be called holding struct_ mutex
*
* Frees the object
*/
@@ -427,14 +438,40 @@
if (dev->driver->gem_free_object != NULL)
dev->driver->gem_free_object(obj);
- fput(obj->filp);
- atomic_dec(&dev->object_count);
- atomic_sub(obj->size, &dev->object_memory);
- kfree(obj);
+ drm_gem_object_free_common(obj);
}
EXPORT_SYMBOL(drm_gem_object_free);
/**
+ * Called after the last reference to the object has been lost.
+ * Must be called without holding struct_mutex
+ *
+ * Frees the object
+ */
+void
+drm_gem_object_free_unlocked(struct kref *kref)
+{
+ struct drm_gem_object *obj = (struct drm_gem_object *) kref;
+ struct drm_device *dev = obj->dev;
+
+ if (dev->driver->gem_free_object_unlocked != NULL)
+ dev->driver->gem_free_object_unlocked(obj);
+ else if (dev->driver->gem_free_object != NULL) {
+ mutex_lock(&dev->struct_mutex);
+ dev->driver->gem_free_object(obj);
+ mutex_unlock(&dev->struct_mutex);
+ }
+
+ drm_gem_object_free_common(obj);
+}
+EXPORT_SYMBOL(drm_gem_object_free_unlocked);
+
+static void drm_gem_object_ref_bug(struct kref *list_kref)
+{
+ BUG();
+}
+
+/**
* Called after the last handle to the object has been closed
*
* Removes any name for the object. Note that this must be
@@ -458,8 +495,10 @@
/*
* The object name held a reference to this object, drop
* that now.
+ *
+ * This cannot be the last reference, since the handle holds one too.
*/
- drm_gem_object_unreference(obj);
+ kref_put(&obj->refcount, drm_gem_object_ref_bug);
} else
spin_unlock(&dev->object_name_lock);