Hi Daniel, On 5 Mar 20:23, Daniel Golle wrote: > static int __init blk_nvmem_init(void) > { > int ret; > > ret = class_interface_register(&blk_nvmem_bus_interface); > if (ret) > return ret; > > return 0; Just an idea, why not just: return class_interface_register(&blk_nvmem_bus_interface);