-struct drm_master *drm_master_create(struct drm_minor *minor)
-{
- struct drm_master *master;
-
- master = kzalloc(sizeof(*master), GFP_KERNEL);
- if (!master)
- return NULL;
-
- kref_init(&master->refcount);
- spin_lock_init(&master->lock.spinlock);
- init_waitqueue_head(&master->lock.lock_queue);
- idr_init(&master->magic_map);
- master->minor = minor;
-
- return master;
-}
-
-struct drm_master *drm_master_get(struct drm_master *master)
-{
- kref_get(&master->refcount);
- return master;
-}
-EXPORT_SYMBOL(drm_master_get);
-
-static void drm_master_destroy(struct kref *kref)
-{
- struct drm_master *master = container_of(kref, struct drm_master, refcount);
- struct drm_device *dev = master->minor->dev;
-
- if (dev->driver->master_destroy)
- dev->driver->master_destroy(dev, master);
-
- drm_legacy_master_rmmaps(dev, master);
-
- idr_destroy(&master->magic_map);
- kfree(master->unique);
- kfree(master);
-}
-
-void drm_master_put(struct drm_master **master)
-{
- kref_put(&(*master)->refcount, drm_master_destroy);
- *master = NULL;
-}
-EXPORT_SYMBOL(drm_master_put);
-
-int drm_setmaster_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file_priv)
-{
- int ret = 0;
-
- mutex_lock(&dev->master_mutex);
- if (file_priv->is_master)
- goto out_unlock;
-
- if (file_priv->minor->master) {
- ret = -EINVAL;
- goto out_unlock;
- }
-
- if (!file_priv->master) {
- ret = -EINVAL;
- goto out_unlock;
- }
-
- if (!file_priv->allowed_master) {
- ret = drm_new_set_master(dev, file_priv);
- goto out_unlock;
- }
-
- file_priv->minor->master = drm_master_get(file_priv->master);
- file_priv->is_master = 1;
- if (dev->driver->master_set) {
- ret = dev->driver->master_set(dev, file_priv, false);
- if (unlikely(ret != 0)) {
- file_priv->is_master = 0;
- drm_master_put(&file_priv->minor->master);
- }
- }
-
-out_unlock:
- mutex_unlock(&dev->master_mutex);
- return ret;
-}
-
-int drm_dropmaster_ioctl(struct drm_device *dev, void *data,
- struct drm_file *file_priv)
-{
- int ret = -EINVAL;
-
- mutex_lock(&dev->master_mutex);
- if (!file_priv->is_master)
- goto out_unlock;
-
- if (!file_priv->minor->master)
- goto out_unlock;
-
- ret = 0;
- if (dev->driver->master_drop)
- dev->driver->master_drop(dev, file_priv, false);
- drm_master_put(&file_priv->minor->master);
- file_priv->is_master = 0;
-
-out_unlock:
- mutex_unlock(&dev->master_mutex);
- return ret;
-}
-