On Friday January 5, liyiming@xxxxxxxxxxxx wrote: > In the stop function of any level raid device driver such as faulty, multipath, and raidx > It would better set the mddev->private NULL before free the conf structure. We set it to NULL immediately after the free, and it really doesn't make any different which order they are done in. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html