--- x/drivers/i2c/i2c-core-base.c
+++ y/drivers/i2c/i2c-core-base.c
@@ -1809,7 +1809,6 @@ void i2c_del_adapter(struct i2c_adapter
 	 */
 	init_completion(&adap->dev_released);
 	device_unregister(&adap->dev);
-	wait_for_completion(&adap->dev_released);
 
 	/* free bus id */
 	mutex_lock(&core_lock);