--- zzzz-none-000/linux-3.10.107/drivers/scsi/libsas/sas_scsi_host.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/scsi/libsas/sas_scsi_host.c	2021-02-04 17:41:59.000000000 +0000
@@ -112,7 +112,6 @@
 
 	sc->result = (hs << 16) | stat;
 	ASSIGN_SAS_TASK(sc, NULL);
-	list_del_init(&task->list);
 	sas_free_task(task);
 }
 
@@ -138,7 +137,6 @@
 
 	if (unlikely(!sc)) {
 		SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
-		list_del_init(&task->list);
 		sas_free_task(task);
 		return;
 	}
@@ -167,7 +165,7 @@
 	int_to_scsilun(cmd->device->lun, &lun);
 	memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 	task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
-	memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
+	task->ssp_task.cmd = cmd;
 
 	task->scatter = scsi_sglist(cmd);
 	task->num_scatter = scsi_sg_count(cmd);
@@ -179,31 +177,10 @@
 	return task;
 }
 
-int sas_queue_up(struct sas_task *task)
-{
-	struct sas_ha_struct *sas_ha = task->dev->port->ha;
-	struct scsi_core *core = &sas_ha->core;
-	unsigned long flags;
-	LIST_HEAD(list);
-
-	spin_lock_irqsave(&core->task_queue_lock, flags);
-	if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
-		spin_unlock_irqrestore(&core->task_queue_lock, flags);
-		return -SAS_QUEUE_FULL;
-	}
-	list_add_tail(&task->list, &core->task_queue);
-	core->task_queue_size += 1;
-	spin_unlock_irqrestore(&core->task_queue_lock, flags);
-	wake_up_process(core->queue_thread);
-
-	return 0;
-}
-
 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 {
 	struct sas_internal *i = to_sas_internal(host->transportt);
 	struct domain_device *dev = cmd_to_domain_dev(cmd);
-	struct sas_ha_struct *sas_ha = dev->port->ha;
 	struct sas_task *task;
 	int res = 0;
 
@@ -224,12 +201,7 @@
 	if (!task)
 		return SCSI_MLQUEUE_HOST_BUSY;
 
-	/* Queue up, Direct Mode or Task Collector Mode. */
-	if (sas_ha->lldd_max_execute_num < 2)
-		res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
-	else
-		res = sas_queue_up(task);
-
+	res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 	if (res)
 		goto out_free_task;
 	return 0;
@@ -323,37 +295,17 @@
 	TASK_IS_DONE,
 	TASK_IS_ABORTED,
 	TASK_IS_AT_LU,
-	TASK_IS_NOT_AT_HA,
 	TASK_IS_NOT_AT_LU,
 	TASK_ABORT_FAILED,
 };
 
 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 {
-	struct sas_ha_struct *ha = task->dev->port->ha;
 	unsigned long flags;
 	int i, res;
 	struct sas_internal *si =
 		to_sas_internal(task->dev->port->ha->core.shost->transportt);
 
-	if (ha->lldd_max_execute_num > 1) {
-		struct scsi_core *core = &ha->core;
-		struct sas_task *t, *n;
-
-		mutex_lock(&core->task_queue_flush);
-		spin_lock_irqsave(&core->task_queue_lock, flags);
-		list_for_each_entry_safe(t, n, &core->task_queue, list)
-			if (task == t) {
-				list_del_init(&t->list);
-				break;
-			}
-		spin_unlock_irqrestore(&core->task_queue_lock, flags);
-		mutex_unlock(&core->task_queue_flush);
-
-		if (task == t)
-			return TASK_IS_NOT_AT_HA;
-	}
-
 	for (i = 0; i < 5; i++) {
 		SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 		res = si->dft->lldd_abort_task(task);
@@ -404,7 +356,7 @@
 
 	int_to_scsilun(cmd->device->lun, &lun);
 
-	SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
+	SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
 		    SAS_ADDR(dev->sas_addr),
 		    cmd->device->lun);
 
@@ -490,7 +442,8 @@
 }
 EXPORT_SYMBOL(sas_wait_eh);
 
-static int sas_queue_reset(struct domain_device *dev, int reset_type, int lun, int wait)
+static int sas_queue_reset(struct domain_device *dev, int reset_type,
+			   u64 lun, int wait)
 {
 	struct sas_ha_struct *ha = dev->port->ha;
 	int scheduled = 0, tries = 100;
@@ -666,14 +619,6 @@
 		cmd->eh_eflags = 0;
 
 		switch (res) {
-		case TASK_IS_NOT_AT_HA:
-			SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
-				    __func__, task,
-				    cmd->retries ? "retry" : "aborted");
-			if (cmd->retries)
-				cmd->retries--;
-			sas_eh_finish_cmd(cmd);
-			continue;
 		case TASK_IS_DONE:
 			SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 				    task);
@@ -689,7 +634,7 @@
  reset:
 			tmf_resp = sas_recover_lu(task->dev, cmd);
 			if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
-				SAS_DPRINTK("dev %016llx LU %x is "
+				SAS_DPRINTK("dev %016llx LU %llx is "
 					    "recovered\n",
 					    SAS_ADDR(task->dev),
 					    cmd->device->lun);
@@ -742,7 +687,7 @@
 			 * of effort could recover from errors.  Quite
 			 * possibly the HA just disappeared.
 			 */
-			SAS_DPRINTK("error from  device %llx, LUN %x "
+			SAS_DPRINTK("error from  device %llx, LUN %llx "
 				    "couldn't be recovered in any way\n",
 				    SAS_ADDR(task->dev->sas_addr),
 				    cmd->device->lun);
@@ -812,7 +757,7 @@
 	spin_unlock_irq(shost->host_lock);
 
 	SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
-		    __func__, shost->host_busy, shost->host_failed);
+		    __func__, atomic_read(&shost->host_busy), shost->host_failed);
 	/*
 	 * Deal with commands that still have SAS tasks (i.e. they didn't
 	 * complete via the normal sas_task completion mechanism),
@@ -835,9 +780,6 @@
 		scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 
 out:
-	if (ha->lldd_max_execute_num > 1)
-		wake_up_process(ha->core.queue_thread);
-
 	sas_eh_handle_resets(shost);
 
 	/* now link into libata eh --- if we have any ata devices */
@@ -857,12 +799,13 @@
 		goto retry;
 
 	SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
-		    __func__, shost->host_busy, shost->host_failed, tries);
+		    __func__, atomic_read(&shost->host_busy),
+		    shost->host_failed, tries);
 }
 
 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 {
-	scmd_printk(KERN_DEBUG, cmd, "command %p timed out\n", cmd);
+	scmd_dbg(cmd, "command %p timed out\n", cmd);
 
 	return BLK_EH_NOT_HANDLED;
 }
@@ -938,15 +881,12 @@
 	sas_read_port_mode_page(scsi_dev);
 
 	if (scsi_dev->tagged_supported) {
-		scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
-		scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
+		scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
 	} else {
-		SAS_DPRINTK("device %llx, LUN %x doesn't support "
+		SAS_DPRINTK("device %llx, LUN %llx doesn't support "
 			    "TCQ\n", SAS_ADDR(dev->sas_addr),
 			    scsi_dev->lun);
-		scsi_dev->tagged_supported = 0;
-		scsi_set_tag_type(scsi_dev, 0);
-		scsi_deactivate_tcq(scsi_dev, 1);
+		scsi_change_queue_depth(scsi_dev, 1);
 	}
 
 	scsi_dev->allow_restart = 1;
@@ -954,47 +894,16 @@
 	return 0;
 }
 
-int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
+int sas_change_queue_depth(struct scsi_device *sdev, int depth)
 {
 	struct domain_device *dev = sdev_to_domain_dev(sdev);
 
 	if (dev_is_sata(dev))
-		return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
-						reason);
-
-	switch (reason) {
-	case SCSI_QDEPTH_DEFAULT:
-	case SCSI_QDEPTH_RAMP_UP:
-		if (!sdev->tagged_supported)
-			depth = 1;
-		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
-		break;
-	case SCSI_QDEPTH_QFULL:
-		scsi_track_queue_full(sdev, depth);
-		break;
-	default:
-		return -EOPNOTSUPP;
-	}
-
-	return depth;
-}
-
-int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
-{
-	struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
-
-	if (dev_is_sata(dev))
-		return -EINVAL;
+		return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
 
-	if (!scsi_dev->tagged_supported)
-		return 0;
-
-	scsi_deactivate_tcq(scsi_dev, 1);
-
-	scsi_set_tag_type(scsi_dev, qt);
-	scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
-
-	return qt;
+	if (!sdev->tagged_supported)
+		depth = 1;
+	return scsi_change_queue_depth(sdev, depth);
 }
 
 int sas_bios_param(struct scsi_device *scsi_dev,
@@ -1009,121 +918,6 @@
 	return 0;
 }
 
-/* ---------- Task Collector Thread implementation ---------- */
-
-static void sas_queue(struct sas_ha_struct *sas_ha)
-{
-	struct scsi_core *core = &sas_ha->core;
-	unsigned long flags;
-	LIST_HEAD(q);
-	int can_queue;
-	int res;
-	struct sas_internal *i = to_sas_internal(core->shost->transportt);
-
-	mutex_lock(&core->task_queue_flush);
-	spin_lock_irqsave(&core->task_queue_lock, flags);
-	while (!kthread_should_stop() &&
-	       !list_empty(&core->task_queue) &&
-	       !test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
-
-		can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
-		if (can_queue >= 0) {
-			can_queue = core->task_queue_size;
-			list_splice_init(&core->task_queue, &q);
-		} else {
-			struct list_head *a, *n;
-
-			can_queue = sas_ha->lldd_queue_size;
-			list_for_each_safe(a, n, &core->task_queue) {
-				list_move_tail(a, &q);
-				if (--can_queue == 0)
-					break;
-			}
-			can_queue = sas_ha->lldd_queue_size;
-		}
-		core->task_queue_size -= can_queue;
-		spin_unlock_irqrestore(&core->task_queue_lock, flags);
-		{
-			struct sas_task *task = list_entry(q.next,
-							   struct sas_task,
-							   list);
-			list_del_init(&q);
-			res = i->dft->lldd_execute_task(task, can_queue,
-							GFP_KERNEL);
-			if (unlikely(res))
-				__list_add(&q, task->list.prev, &task->list);
-		}
-		spin_lock_irqsave(&core->task_queue_lock, flags);
-		if (res) {
-			list_splice_init(&q, &core->task_queue); /*at head*/
-			core->task_queue_size += can_queue;
-		}
-	}
-	spin_unlock_irqrestore(&core->task_queue_lock, flags);
-	mutex_unlock(&core->task_queue_flush);
-}
-
-/**
- * sas_queue_thread -- The Task Collector thread
- * @_sas_ha: pointer to struct sas_ha
- */
-static int sas_queue_thread(void *_sas_ha)
-{
-	struct sas_ha_struct *sas_ha = _sas_ha;
-
-	while (1) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule();
-		sas_queue(sas_ha);
-		if (kthread_should_stop())
-			break;
-	}
-
-	return 0;
-}
-
-int sas_init_queue(struct sas_ha_struct *sas_ha)
-{
-	struct scsi_core *core = &sas_ha->core;
-
-	spin_lock_init(&core->task_queue_lock);
-	mutex_init(&core->task_queue_flush);
-	core->task_queue_size = 0;
-	INIT_LIST_HEAD(&core->task_queue);
-
-	core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
-					 "sas_queue_%d", core->shost->host_no);
-	if (IS_ERR(core->queue_thread))
-		return PTR_ERR(core->queue_thread);
-	return 0;
-}
-
-void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
-{
-	unsigned long flags;
-	struct scsi_core *core = &sas_ha->core;
-	struct sas_task *task, *n;
-
-	kthread_stop(core->queue_thread);
-
-	if (!list_empty(&core->task_queue))
-		SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
-			    SAS_ADDR(sas_ha->sas_addr));
-
-	spin_lock_irqsave(&core->task_queue_lock, flags);
-	list_for_each_entry_safe(task, n, &core->task_queue, list) {
-		struct scsi_cmnd *cmd = task->uldd_task;
-
-		list_del_init(&task->list);
-
-		ASSIGN_SAS_TASK(cmd, NULL);
-		sas_free_task(task);
-		cmd->result = DID_ABORT << 16;
-		cmd->scsi_done(cmd);
-	}
-	spin_unlock_irqrestore(&core->task_queue_lock, flags);
-}
-
 /*
  * Tell an upper layer that it needs to initiate an abort for a given task.
  * This should only ever be called by an LLDD.
@@ -1210,7 +1004,6 @@
 EXPORT_SYMBOL_GPL(sas_target_alloc);
 EXPORT_SYMBOL_GPL(sas_slave_configure);
 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
-EXPORT_SYMBOL_GPL(sas_change_queue_type);
 EXPORT_SYMBOL_GPL(sas_bios_param);
 EXPORT_SYMBOL_GPL(sas_task_abort);
 EXPORT_SYMBOL_GPL(sas_phy_reset);