On Mon, 6 Jan 2014, Phillip Susi wrote: > The issue is that the REQ_PM flagged REQUEST SENSE command issued > during the system_resume is never dispatched. I patched scsi_execute > to make the request type REQ_TYPE_PM_RESUME and that got the request > dispatched. Note that REQ_TYPE_PM_RESUME is a fossil. It is used for power management in the legacy IDE driver and nowhere else (although there is a single vestige of that use remaining in the block layer). It should be removed -- if anybody feels like cleaning up the IDE driver. > Looking at the code a bit more today, it looks like REQ_PM has > blk_peek_request return the request to scsi_request_fn, but it refuses > to dispatch it unless it is of type REQ_TYPE_PM_RESUME apparently > because the queue is stopped. I suppose now the question is why is it > stopped? Indeed. I can't see any place where the SCSI or block layers would stop the queue of a device when it gets runtime suspended. Maybe some other layer is doing this. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
