5 files changed, 23 insertions, 16 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 1b950b45cf4b..8d7fd65ccced 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -102,6 +102,9 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 		return;
 	}
 
+	if (!mem)
+		return;
+
 	man = ttm_manager_type(bdev, mem->mem_type);
 	list_move_tail(&bo->lru, &man->lru[bo->priority]);
 
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 2f57f824e6db..763fa6f4e07d 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -63,6 +63,9 @@ int ttm_mem_io_reserve(struct ttm_device *bdev,
 void ttm_mem_io_free(struct ttm_device *bdev,
 		     struct ttm_resource *mem)
 {
+	if (!mem)
+		return;
+
 	if (!mem->bus.offset && !mem->bus.addr)
 		return;
 
diff --git a/drivers/gpu/drm/ttm/ttm_device.c b/drivers/gpu/drm/ttm/ttm_device.c
index 5f31acec3ad7..74e3b460132b 100644
--- a/drivers/gpu/drm/ttm/ttm_device.c
+++ b/drivers/gpu/drm/ttm/ttm_device.c
@@ -44,6 +44,8 @@ static unsigned ttm_glob_use_count;
 struct ttm_global ttm_glob;
 EXPORT_SYMBOL(ttm_glob);
 
+struct dentry *ttm_debugfs_root;
+
 static void ttm_global_release(void)
 {
 	struct ttm_global *glob = &ttm_glob;
@@ -53,6 +55,7 @@ static void ttm_global_release(void)
 		goto out;
 
 	ttm_pool_mgr_fini();
+	debugfs_remove(ttm_debugfs_root);
 
 	__free_page(glob->dummy_read_page);
 	memset(glob, 0, sizeof(*glob));
@@ -73,6 +76,13 @@ static int ttm_global_init(void)
 
 	si_meminfo(&si);
 
+	ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
+	if (IS_ERR(ttm_debugfs_root)) {
+		ret = PTR_ERR(ttm_debugfs_root);
+		ttm_debugfs_root = NULL;
+		goto out;
+	}
+
 	/* Limit the number of pages in the pool to about 50% of the total
 	 * system memory.
 	 */
@@ -100,6 +110,10 @@ static int ttm_global_init(void)
 	debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root,
 				&glob->bo_count);
 out:
+	if (ret && ttm_debugfs_root)
+		debugfs_remove(ttm_debugfs_root);
+	if (ret)
+		--ttm_glob_use_count;
 	mutex_unlock(&ttm_global_mutex);
 	return ret;
 }
diff --git a/drivers/gpu/drm/ttm/ttm_module.c b/drivers/gpu/drm/ttm/ttm_module.c
index 997c458f68a9..7fcdef278c74 100644
--- a/drivers/gpu/drm/ttm/ttm_module.c
+++ b/drivers/gpu/drm/ttm/ttm_module.c
@@ -72,22 +72,6 @@ pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
 	return tmp;
 }
 
-struct dentry *ttm_debugfs_root;
-
-static int __init ttm_init(void)
-{
-	ttm_debugfs_root = debugfs_create_dir("ttm", NULL);
-	return 0;
-}
-
-static void __exit ttm_exit(void)
-{
-	debugfs_remove(ttm_debugfs_root);
-}
-
-module_init(ttm_init);
-module_exit(ttm_exit);
-
 MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
 MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
 MODULE_LICENSE("GPL and additional rights");
diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
index 03395386e8a7..f4b08a8705b3 100644
--- a/drivers/gpu/drm/ttm/ttm_range_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
@@ -181,6 +181,9 @@ int ttm_range_man_fini(struct ttm_device *bdev,
 	struct drm_mm *mm = &rman->mm;
 	int ret;
 
+	if (!man)
+		return 0;
+
 	ttm_resource_manager_set_used(man, false);
 
 	ret = ttm_resource_manager_evict_all(bdev, man);