text: /*
   * Aic94xx SAS/SATA Tasks
   *
   * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   *
   * This file is licensed under GPLv2.
   *
   * This file is part of the aic94xx driver.
   *
   * The aic94xx driver is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation; version 2 of the
   * License.
   *
   * The aic94xx driver is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with the aic94xx driver; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   *
   */
  
  #include <linux/spinlock.h>
  #include "aic94xx.h"
  #include "aic94xx_sas.h"
  #include "aic94xx_hwi.h"
  
  static void asd_unbuild_ata_ascb(struct asd_ascb *a);
  static void asd_unbuild_smp_ascb(struct asd_ascb *a);
  static void asd_unbuild_ssp_ascb(struct asd_ascb *a);
  
  static void asd_can_dequeue(struct asd_ha_struct *asd_ha, int num)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
  	asd_ha->seq.can_queue += num;
  	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
  }
  
  /* PCI_DMA_... to our direction translation.
   */
  static const u8 data_dir_flags[] = {
  	[PCI_DMA_BIDIRECTIONAL] = DATA_DIR_BYRECIPIENT,	/* UNSPECIFIED */
  	[PCI_DMA_TODEVICE]      = DATA_DIR_OUT, /* OUTBOUND */
  	[PCI_DMA_FROMDEVICE]    = DATA_DIR_IN, /* INBOUND */
  	[PCI_DMA_NONE]          = DATA_DIR_NONE, /* NO TRANSFER */
  };
  
  static int asd_map_scatterlist(struct sas_task *task,
  			       struct sg_el *sg_arr,
  			       gfp_t gfp_flags)
  {
  	struct asd_ascb *ascb = task->lldd_task;
  	struct asd_ha_struct *asd_ha = ascb->ha;
  	struct scatterlist *sc;
  	int num_sg, res;
  
  	if (task->data_dir == PCI_DMA_NONE)
  		return 0;
  
  	if (task->num_scatter == 0) {
  		void *p = task->scatter;
  		dma_addr_t dma = pci_map_single(asd_ha->pcidev, p,
  						task->total_xfer_len,
  						task->data_dir);
  		sg_arr[0].bus_addr = cpu_to_le64((u64)dma);
  		sg_arr[0].size = cpu_to_le32(task->total_xfer_len);
  		sg_arr[0].flags |= ASD_SG_EL_LIST_EOL;
  		return 0;
  	}
  
  	/* STP tasks come from libata which has already mapped
  	 * the SG list */
  	if (sas_protocol_ata(task->task_proto))
  		num_sg = task->num_scatter;
  	else
  		num_sg = pci_map_sg(asd_ha->pcidev, task->scatter,
  				    task->num_scatter, task->data_dir);
  	if (num_sg == 0)
  		return -ENOMEM;
  
  	if (num_sg > 3) {
  		int i;
  
  		ascb->sg_arr = asd_alloc_coherent(asd_ha,
  						  num_sg*sizeof(struct sg_el),
  						  gfp_flags);
  		if (!ascb->sg_arr) {
  			res = -ENOMEM;
  			goto err_unmap;
  		}
  		for_each_sg(task->scatter, sc, num_sg, i) {
  			struct sg_el *sg =
  				&((struct sg_el *)ascb->sg_arr->vaddr)[i];
  			sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
  			sg->size = cpu_to_le32((u32)sg_dma_len(sc));
  			if (i == num_sg-1)
  				sg->flags |= ASD_SG_EL_LIST_EOL;
  		}
  
  		for_each_sg(task->scatter, sc, 2, i) {
  			sg_arr[i].bus_addr =
  				cpu_to_le64((u64)sg_dma_address(sc));
  			sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
  		}
  		sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
  		sg_arr[1].flags |= ASD_SG_EL_LIST_EOS;
  
  		memset(&sg_arr[2], 0, sizeof(*sg_arr));
  		sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
  	} else {
  		int i;
  		for_each_sg(task->scatter, sc, num_sg, i) {
  			sg_arr[i].bus_addr =
  				cpu_to_le64((u64)sg_dma_address(sc));
  			sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
  		}
  		sg_arr[i-1].flags |= ASD_SG_EL_LIST_EOL;
  	}
  
  	return 0;
  err_unmap:
  	if (sas_protocol_ata(task->task_proto))
  		pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
  			     task->data_dir);
  	return res;
  }
  
  static void asd_unmap_scatterlist(struct asd_ascb *ascb)
  {
  	struct asd_ha_struct *asd_ha = ascb->ha;
  	struct sas_task *task = ascb->uldd_task;
  
  	if (task->data_dir == PCI_DMA_NONE)
  		return;
  
  	if (task->num_scatter == 0) {
  		dma_addr_t dma = (dma_addr_t)
  		       le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
  		pci_unmap_single(ascb->ha->pcidev, dma, task->total_xfer_len,
  				 task->data_dir);
  		return;
  	}
  
  	asd_free_coherent(asd_ha, ascb->sg_arr);
  	if (task->task_proto != SAS_PROTOCOL_STP)
  		pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
  			     task->data_dir);
  }
  
  /* ---------- Task complete tasklet ---------- */
  
  static void asd_get_response_tasklet(struct asd_ascb *ascb,
  				     struct done_list_struct *dl)
  {
  	struct asd_ha_struct *asd_ha = ascb->ha;
  	struct sas_task *task = ascb->uldd_task;
  	struct task_status_struct *ts = &task->task_status;
  	unsigned long flags;
  	struct tc_resp_sb_struct {
  		__le16 index_escb;
  		u8     len_lsb;
  		u8     flags;
  	} __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
  
  /* 	int  size   = ((resp_sb->flags & 7) << 8) | resp_sb->len_lsb; */
  	int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
  	struct asd_ascb *escb;
  	struct asd_dma_tok *edb;
  	void *r;
  
  	spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
  	escb = asd_tc_index_find(&asd_ha->seq,
  				 (int)le16_to_cpu(resp_sb->index_escb));
  	spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
  
  	if (!escb) {
  		ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
  		return;
  	}
  
  	ts->buf_valid_size = 0;
  	edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
  	r = edb->vaddr;
  	if (task->task_proto == SAS_PROTOCOL_SSP) {
  		struct ssp_response_iu *iu =
  			r + 16 + sizeof(struct ssp_frame_hdr);
  
  		ts->residual = le32_to_cpu(*(__le32 *)r);
  
  		sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
  	}  else {
  		struct ata_task_resp *resp = (void *) &ts->buf[0];
  
  		ts->residual = le32_to_cpu(*(__le32 *)r);
  
  		if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
  			resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
  			memcpy(&resp->ending_fis[0], r+16, ATA_RESP_FIS_SIZE);
  			ts->buf_valid_size = sizeof(*resp);
  		}
  	}
  
  	asd_invalidate_edb(escb, edb_id);
  }
  
  static void asd_task_tasklet_complete(struct asd_ascb *ascb,
  				      struct done_list_struct *dl)
  {
  	struct sas_task *task = ascb->uldd_task;
  	struct task_status_struct *ts = &task->task_status;
  	unsigned long flags;
  	u8 opcode = dl->opcode;
  
  	asd_can_dequeue(ascb->ha, 1);
  
  Again:
  	switch (opcode) {
  	case TC_NO_ERROR:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAM_STAT_GOOD;
  		break;
  	case TC_UNDERRUN:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_DATA_UNDERRUN;
  		ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
  		break;
  	case TC_OVERRUN:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_DATA_OVERRUN;
  		ts->residual = 0;
  		break;
  	case TC_SSP_RESP:
  	case TC_ATA_RESP:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_PROTO_RESPONSE;
  		asd_get_response_tasklet(ascb, dl);
  		break;
  	case TF_OPEN_REJECT:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_OPEN_REJECT;
  		if (dl->status_block[1] & 2)
  			ts->open_rej_reason = 1 + dl->status_block[2];
  		else if (dl->status_block[1] & 1)
  			ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
  		else
  			ts->open_rej_reason = SAS_OREJ_UNKNOWN;
  		break;
  	case TF_OPEN_TO:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_OPEN_TO;
  		break;
  	case TF_PHY_DOWN:
  	case TU_PHY_DOWN:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_PHY_DOWN;
  		break;
  	case TI_PHY_DOWN:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_PHY_DOWN;
  		break;
  	case TI_BREAK:
  	case TI_PROTO_ERR:
  	case TI_NAK:
  	case TI_ACK_NAK_TO:
  	case TF_SMP_XMIT_RCV_ERR:
  	case TC_ATA_R_ERR_RECV:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_INTERRUPTED;
  		break;
  	case TF_BREAK:
  	case TU_BREAK:
  	case TU_ACK_NAK_TO:
  	case TF_SMPRSP_TO:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_DEV_NO_RESPONSE;
  		break;
  	case TF_NAK_RECV:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_NAK_R_ERR;
  		break;
  	case TA_I_T_NEXUS_LOSS:
  		opcode = dl->status_block[0];
  		goto Again;
  		break;
  	case TF_INV_CONN_HANDLE:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_DEVICE_UNKNOWN;
  		break;
  	case TF_REQUESTED_N_PENDING:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_PENDING;
  		break;
  	case TC_TASK_CLEARED:
  	case TA_ON_REQ:
  		ts->resp = SAS_TASK_COMPLETE;
  		ts->stat = SAS_ABORTED_TASK;
  		break;
  
  	case TF_NO_SMP_CONN:
  	case TF_TMF_NO_CTX:
  	case TF_TMF_NO_TAG:
  	case TF_TMF_TAG_FREE:
  	case TF_TMF_TASK_DONE:
  	case TF_TMF_NO_CONN_HANDLE:
  	case TF_IRTT_TO:
  	case TF_IU_SHORT:
  	case TF_DATA_OFFS_ERR:
  		ts->resp = SAS_TASK_UNDELIVERED;
  		ts->stat = SAS_DEV_NO_RESPONSE;
  		break;
  
  	case TC_LINK_ADM_RESP:
  	case TC_CONTROL_PHY:
  	case TC_RESUME:
  	case TC_PARTIAL_SG_LIST:
  	default:
  		ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __func__, opcode);
  		break;
  	}
  
  	switch (task->task_proto) {
  	case SAS_PROTOCOL_SATA:
  	case SAS_PROTOCOL_STP:
  		asd_unbuild_ata_ascb(ascb);
  		break;
  	case SAS_PROTOCOL_SMP:
  		asd_unbuild_smp_ascb(ascb);
  		break;
  	case SAS_PROTOCOL_SSP:
  		asd_unbuild_ssp_ascb(ascb);
  	default:
  		break;
  	}
  
  	spin_lock_irqsave(&task->task_state_lock, flags);
  	task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
  	task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
  	task->task_state_flags |= SAS_TASK_STATE_DONE;
  	if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
  		struct completion *completion = ascb->completion;
  		spin_unlock_irqrestore(&task->task_state_lock, flags);
  		ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
  			    "stat 0x%x but aborted by upper layer!\n",
  			    task, opcode, ts->resp, ts->stat);
  		if (completion)
  			complete(completion);
  	} else {
  		spin_unlock_irqrestore(&task->task_state_lock, flags);
  		task->lldd_task = NULL;
  		asd_ascb_free(ascb);
  		mb();
  		task->task_done(task);
  	}
  }
  
  /* ---------- ATA ---------- */
  
  static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
  			      gfp_t gfp_flags)
  {
  	struct domain_device *dev = task->dev;
  	struct scb *scb;
  	u8     flags;
  	int    res = 0;
  
  	scb = ascb->scb;
  
  	if (unlikely(task->ata_task.device_control_reg_update))
  		scb->header.opcode = CONTROL_ATA_DEV;
  	else if (dev->sata_dev.class == ATA_DEV_ATAPI)
  		scb->header.opcode = INITIATE_ATAPI_TASK;
  	else
  		scb->header.opcode = INITIATE_ATA_TASK;
  
  	scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
  	if (dev->port->oob_mode == SAS_OOB_MODE)
  		scb->ata_task.proto_conn_rate |= dev->linkrate;
  
  	scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
  	scb->ata_task.fis = task->ata_task.fis;
  	if (likely(!task->ata_task.device_control_reg_update))
  		scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
  	scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
  	if (dev->sata_dev.class == ATA_DEV_ATAPI)
  		memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
  		       16);
  	scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
  	scb->ata_task.conn_handle = cpu_to_le16(
  		(u16)(unsigned long)dev->lldd_dev);
  
  	if (likely(!task->ata_task.device_control_reg_update)) {
  		flags = 0;
  		if (task->ata_task.dma_xfer)
  			flags |= DATA_XFER_MODE_DMA;
  		if (task->ata_task.use_ncq &&
  		    dev->sata_dev.class != ATA_DEV_ATAPI)
  			flags |= ATA_Q_TYPE_NCQ;
  		flags |= data_dir_flags[task->data_dir];
  		scb->ata_task.ata_flags = flags;
  
  		scb->ata_task.retry_count = task->ata_task.retry_count;
  
  		flags = 0;
  		if (task->ata_task.set_affil_pol)
  			flags |= SET_AFFIL_POLICY;
  		if (task->ata_task.stp_affil_pol)
  			flags |= STP_AFFIL_POLICY;
  		scb->ata_task.flags = flags;
  	}
  	ascb->tasklet_complete = asd_task_tasklet_complete;
  
  	if (likely(!task->ata_task.device_control_reg_update))
  		res = asd_map_scatterlist(task, scb->ata_task.sg_element,
  					  gfp_flags);
  
  	return res;
  }
  
  static void asd_unbuild_ata_ascb(struct asd_ascb *a)
  {
  	asd_unmap_scatterlist(a);
  }
  
  /* ---------- SMP ---------- */
  
  static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
  			      gfp_t gfp_flags)
  {
  	struct asd_ha_struct *asd_ha = ascb->ha;
  	struct domain_device *dev = task->dev;
  	struct scb *scb;
  
  	pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
  		   PCI_DMA_TODEVICE);
  	pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
  		   PCI_DMA_FROMDEVICE);
  
  	scb = ascb->scb;
  
  	scb->header.opcode = INITIATE_SMP_TASK;
  
  	scb->smp_task.proto_conn_rate = dev->linkrate;
  
  	scb->smp_task.smp_req.bus_addr =
  		cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
  	scb->smp_task.smp_req.size =
  		cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
  
  	scb->smp_task.smp_resp.bus_addr =
  		cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
  	scb->smp_task.smp_resp.size =
  		cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
  
  	scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
  	scb->smp_task.conn_handle = cpu_to_le16((u16)
  						(unsigned long)dev->lldd_dev);
  
  	ascb->tasklet_complete = asd_task_tasklet_complete;
  
  	return 0;
  }
  
  static void asd_unbuild_smp_ascb(struct asd_ascb *a)
  {
  	struct sas_task *task = a->uldd_task;
  
  	BUG_ON(!task);
  	pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
  		     PCI_DMA_TODEVICE);
  	pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
  		     PCI_DMA_FROMDEVICE);
  }
  
  /* ---------- SSP ---------- */
  
  static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
  			      gfp_t gfp_flags)
  {
  	struct domain_device *dev = task->dev;
  	struct scb *scb;
  	int    res = 0;
  
  	scb = ascb->scb;
  
  	scb->header.opcode = INITIATE_SSP_TASK;
  
  	scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
  	scb->ssp_task.proto_conn_rate |= dev->linkrate;
  	scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
  	scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
  	memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
  	       HASHED_SAS_ADDR_SIZE);
  	memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
  	       dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
  	scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
  
  	memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
  	if (task->ssp_task.enable_first_burst)
  		scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
  	scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
  	scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
  	memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cmd->cmnd,
  	       task->ssp_task.cmd->cmd_len);
  
  	scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
  	scb->ssp_task.conn_handle = cpu_to_le16(
  		(u16)(unsigned long)dev->lldd_dev);
  	scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
  	scb->ssp_task.retry_count = scb->ssp_task.retry_count;
  
  	ascb->tasklet_complete = asd_task_tasklet_complete;
  
  	res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
  
  	return res;
  }
  
  static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
  {
  	asd_unmap_scatterlist(a);
  }
  
  /* ---------- Execute Task ---------- */
  
  static int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
  {
  	int res = 0;
  	unsigned long flags;
  
  	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
  	if ((asd_ha->seq.can_queue - num) < 0)
  		res = -SAS_QUEUE_FULL;
  	else
  		asd_ha->seq.can_queue -= num;
  	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
  
  	return res;
  }
  
  int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
  {
  	int res = 0;
  	LIST_HEAD(alist);
  	struct sas_task *t = task;
  	struct asd_ascb *ascb = NULL, *a;
  	struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
  	unsigned long flags;
  
  	res = asd_can_queue(asd_ha, 1);
  	if (res)
  		return res;
  
  	res = 1;
  	ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
  	if (res) {
  		res = -ENOMEM;
  		goto out_err;
  	}
  
  	__list_add(&alist, ascb->list.prev, &ascb->list);
  	list_for_each_entry(a, &alist, list) {
  		a->uldd_task = t;
  		t->lldd_task = a;
  		break;
  	}
  	list_for_each_entry(a, &alist, list) {
  		t = a->uldd_task;
  		a->uldd_timer = 1;
  		if (t->task_proto & SAS_PROTOCOL_STP)
  			t->task_proto = SAS_PROTOCOL_STP;
  		switch (t->task_proto) {
  		case SAS_PROTOCOL_SATA:
  		case SAS_PROTOCOL_STP:
  			res = asd_build_ata_ascb(a, t, gfp_flags);
  			break;
  		case SAS_PROTOCOL_SMP:
  			res = asd_build_smp_ascb(a, t, gfp_flags);
  			break;
  		case SAS_PROTOCOL_SSP:
  			res = asd_build_ssp_ascb(a, t, gfp_flags);
  			break;
  		default:
  			asd_printk("unknown sas_task proto: 0x%x\n",
  				   t->task_proto);
  			res = -ENOMEM;
  			break;
  		}
  		if (res)
  			goto out_err_unmap;
  
  		spin_lock_irqsave(&t->task_state_lock, flags);
  		t->task_state_flags |= SAS_TASK_AT_INITIATOR;
  		spin_unlock_irqrestore(&t->task_state_lock, flags);
  	}
  	list_del_init(&alist);
  
  	res = asd_post_ascb_list(asd_ha, ascb, 1);
  	if (unlikely(res)) {
  		a = NULL;
  		__list_add(&alist, ascb->list.prev, &ascb->list);
  		goto out_err_unmap;
  	}
  
  	return 0;
  out_err_unmap:
  	{
  		struct asd_ascb *b = a;
  		list_for_each_entry(a, &alist, list) {
  			if (a == b)
  				break;
  			t = a->uldd_task;
  			spin_lock_irqsave(&t->task_state_lock, flags);
  			t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
  			spin_unlock_irqrestore(&t->task_state_lock, flags);
  			switch (t->task_proto) {
  			case SAS_PROTOCOL_SATA:
  			case SAS_PROTOCOL_STP:
  				asd_unbuild_ata_ascb(a);
  				break;
  			case SAS_PROTOCOL_SMP:
  				asd_unbuild_smp_ascb(a);
  				break;
  			case SAS_PROTOCOL_SSP:
  				asd_unbuild_ssp_ascb(a);
  			default:
  				break;
  			}
  			t->lldd_task = NULL;
  		}
  	}
  	list_del_init(&alist);
  out_err:
  	if (ascb)
  		asd_ascb_free_list(ascb);
  	asd_can_dequeue(asd_ha, 1);
  	return res;
  }
  