I just came across the SCSI midlayer function scsi_track_queue_full. If a SCSI command is returned with a status of QUEUE_FULL, then this is mapped to ADD_TO_MLQUEUE and "device blocked". So, there is already a mechanism in place. Is a LLD driver expected to additionally call something like this to decrease the queue depth? if (status_byte(scmd->result) == QUEUE_FULL) scsi_track_queue_full(sdev, sdev->queue_depth - 1)) If a LLD does this, should it also increase the queue depth again when no more QUEUE_FULL status are seen? To me this looks like a duplication of the midlayer device blocking, but i assume there is a reason in having both, scsi_track_queue_full and the device blocking. -- Christof Schmitt -- 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
