drm/ttm: make the device list mutex static

This way it can protect the whole BO global state.

Signed-off-by: Christian König <[e-mail]>
Reviewed-by: Junwei Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/ttm/ttm_bo.c

···
 
 static void ttm_bo_global_kobj_release(struct kobject *kobj);
 
+/**
+ * ttm_global_mutex - protecting the global BO state
+ */
+DEFINE_MUTEX(ttm_global_mutex);
+
 static struct attribute ttm_bo_count = {
 	.name = "bo_count",
 	.mode = S_IRUGO
···
 	if (ret)
 		return ret;
 
-	mutex_init(&glob->device_list_mutex);
 	spin_lock_init(&glob->lru_lock);
 	glob->mem_glob = &ttm_mem_glob;
 	glob->mem_glob->bo_glob = glob;
···
 		}
 	}
 
-	mutex_lock(&glob->device_list_mutex);
+	mutex_lock(&ttm_global_mutex);
 	list_del(&bdev->device_list);
-	mutex_unlock(&glob->device_list_mutex);
+	mutex_unlock(&ttm_global_mutex);
 
 	cancel_delayed_work_sync(&bdev->wq);
 
···
 	bdev->dev_mapping = mapping;
 	bdev->glob = glob;
 	bdev->need_dma32 = need_dma32;
-	mutex_lock(&glob->device_list_mutex);
+	mutex_lock(&ttm_global_mutex);
 	list_add_tail(&bdev->device_list, &glob->device_list);
-	mutex_unlock(&glob->device_list_mutex);
+	mutex_unlock(&ttm_global_mutex);
 
 	return 0;
 out_no_sys:

include/drm/ttm/ttm_bo_driver.h

···
 	struct kobject kobj;
 	struct ttm_mem_global *mem_glob;
 	struct page *dummy_read_page;
-	struct mutex device_list_mutex;
 	spinlock_t lru_lock;
 
 	/**