On Fri, 2018-07-27 at 09:57 +-0800, jianchao.wang wrote: +AD4- If q+AF8-usage+AF8-counter is not zero here, we will leave the request+AF8-queue in preempt only mode. That's on purpose. If q+AF8-usage+AF8-counter is not zero then blk+AF8-pre+AF8-runtime+AF8-suspend() will return -EBUSY. That error code will be passed to blk+AF8-post+AF8-runtime+AF8-suspend() and that will cause that function to clear QUEUE+AF8-FLAG+AF8-PREEMPT+AF8-ONLY. +AD4- The request+AF8-queue should be set to preempt only mode only when we confirm we could set +AD4- rpm+AF8-status to RPM+AF8-SUSPENDING or RPM+AF8-RESUMING. Why do you think this? Bart.
