On Tue, Aug 07, 2018 at 03:51:25PM -0700, Bart Van Assche wrote: > The RQF_PREEMPT flag is used for three purposes: > - In the SCSI core, for making sure that power management requests > are executed if a device is in the "quiesced" state. > - For domain validation by SCSI drivers that use the parallel port. > - In the IDE driver, for IDE preempt requests. I think the above description may not be accurate, BLK_MQ_REQ_PREEMPT is always set inside scsi_execute(), that means any scsi_execute() callers can use the flag of RQF_PREEMPT, of course, not limited to the above three cases. Thanks, Ming
