drivers/target/target_core_tmr.c - arm/linux-arm64-legacy - Git at Google

 /*******************************************************************************
  * Filename:  target_core_tmr.c
  *
  * This file contains SPC-3 task management infrastructure
  *
  * Copyright (c) 2009,2010 Rising Tide Systems
  * Copyright (c) 2009,2010 Linux-iSCSI.org
  *
  * Nicholas A. Bellinger <nab@kernel.org>
  *
  * This program 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; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program 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 this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  *
  ******************************************************************************/

 #include <linux/version.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>

 #include <target/target_core_base.h>
 #include <target/target_core_device.h>
 #include <target/target_core_tmr.h>
 #include <target/target_core_transport.h>
 #include <target/target_core_fabric_ops.h>
 #include <target/target_core_configfs.h>

 #include "target_core_alua.h"
 #include "target_core_pr.h"

 struct se_tmr_req *core_tmr_alloc_req(
 	struct se_cmd *se_cmd,
 	void *fabric_tmr_ptr,
 	u8 function)
 {
 	struct se_tmr_req *tmr;

 	tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
 					GFP_ATOMIC : GFP_KERNEL);
 	if (!tmr) {
 		pr_err("Unable to allocate struct se_tmr_req\n");
 		return ERR_PTR(-ENOMEM);
 	}
 	tmr->task_cmd = se_cmd;
 	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
 	tmr->function = function;
 	INIT_LIST_HEAD(&tmr->tmr_list);

 	return tmr;
 }
 EXPORT_SYMBOL(core_tmr_alloc_req);

 void core_tmr_release_req(
 	struct se_tmr_req *tmr)
 {
 	struct se_device *dev = tmr->tmr_dev;

 	if (!dev) {
 		kmem_cache_free(se_tmr_req_cache, tmr);
 		return;
 	}

 	spin_lock_irq(&dev->se_tmr_lock);
 	list_del(&tmr->tmr_list);
 	spin_unlock_irq(&dev->se_tmr_lock);

 	kmem_cache_free(se_tmr_req_cache, tmr);
 }

 static void core_tmr_handle_tas_abort(
 	struct se_node_acl *tmr_nacl,
 	struct se_cmd *cmd,
 	int tas,
 	int fe_count)
 {
 	if (!fe_count) {
 		transport_cmd_finish_abort(cmd, 1);
 		return;
 	}
 	/*
 	 * TASK ABORTED status (TAS) bit support
 	*/
 	if ((tmr_nacl &&
 	     (tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
 		transport_send_task_abort(cmd);

 	transport_cmd_finish_abort(cmd, 0);
 }

 int core_tmr_lun_reset(
 	struct se_device *dev,
 	struct se_tmr_req *tmr,
 	struct list_head *preempt_and_abort_list,
 	struct se_cmd *prout_cmd)
 {
 	struct se_cmd *cmd, *tcmd;
 	struct se_node_acl *tmr_nacl = NULL;
 	struct se_portal_group *tmr_tpg = NULL;
 	struct se_queue_obj *qobj = &dev->dev_queue_obj;
 	struct se_tmr_req *tmr_p, *tmr_pp;
 	struct se_task *task, *task_tmp;
 	unsigned long flags;
 	int fe_count, tas;
 	/*
 	 * TASK_ABORTED status bit, this is configurable via ConfigFS
 	 * struct se_device attributes.  spc4r17 section 7.4.6 Control mode page
 	 *
 	 * A task aborted status (TAS) bit set to zero specifies that aborted
 	 * tasks shall be terminated by the device server without any response
 	 * to the application client. A TAS bit set to one specifies that tasks
 	 * aborted by the actions of an I_T nexus other than the I_T nexus on
 	 * which the command was received shall be completed with TASK ABORTED
 	 * status (see SAM-4).
 	 */
 	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
 	/*
 	 * Determine if this se_tmr is coming from a $FABRIC_MOD
 	 * or struct se_device passthrough..
 	 */
 	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
 		tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
 		tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
 		if (tmr_nacl && tmr_tpg) {
 			pr_debug("LUN_RESET: TMR caller fabric: %s"
 				" initiator port %s\n",
 				tmr_tpg->se_tpg_tfo->get_fabric_name(),
 				tmr_nacl->initiatorname);
 		}
 	}
 	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
 		(preempt_and_abort_list) ? "Preempt" : "TMR",
 		dev->transport->name, tas);
 	/*
 	 * Release all pending and outgoing TMRs aside from the received
 	 * LUN_RESET tmr..
 	 */
 	spin_lock_irq(&dev->se_tmr_lock);
 	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
 		/*
 		 * Allow the received TMR to return with FUNCTION_COMPLETE.
 		 */
 		if (tmr && (tmr_p == tmr))
 			continue;

 		cmd = tmr_p->task_cmd;
 		if (!cmd) {
 			pr_err("Unable to locate struct se_cmd for TMR\n");
 			continue;
 		}
 		/*
 		 * If this function was called with a valid pr_res_key
 		 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action
 		 * skip non regisration key matching TMRs.
 		 */
 		if (preempt_and_abort_list &&
 		    (core_scsi3_check_cdb_abort_and_preempt(
 					preempt_and_abort_list, cmd) != 0))
 			continue;
 		spin_unlock_irq(&dev->se_tmr_lock);

 		spin_lock_irqsave(&cmd->t_state_lock, flags);
 		if (!atomic_read(&cmd->t_transport_active)) {
 			spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 			spin_lock_irq(&dev->se_tmr_lock);
 			continue;
 		}
 		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
 			spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 			spin_lock_irq(&dev->se_tmr_lock);
 			continue;
 		}
 		pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
 			" Response: 0x%02x, t_state: %d\n",
 			(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
 			tmr_p->function, tmr_p->response, cmd->t_state);
 		spin_unlock_irqrestore(&cmd->t_state_lock, flags);

 		transport_cmd_finish_abort_tmr(cmd);
 		spin_lock_irq(&dev->se_tmr_lock);
 	}
 	spin_unlock_irq(&dev->se_tmr_lock);
 	/*
 	 * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
 	 * This is following sam4r17, section 5.6 Aborting commands, Table 38
 	 * for TMR LUN_RESET:
 	 *
 	 * a) "Yes" indicates that each command that is aborted on an I_T nexus
 	 * other than the one that caused the SCSI device condition is
 	 * completed with TASK ABORTED status, if the TAS bit is set to one in
 	 * the Control mode page (see SPC-4). "No" indicates that no status is
 	 * returned for aborted commands.
 	 *
 	 * d) If the logical unit reset is caused by a particular I_T nexus
 	 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
 	 * (TASK_ABORTED status) applies.
 	 *
 	 * Otherwise (e.g., if triggered by a hard reset), "no"
 	 * (no TASK_ABORTED SAM status) applies.
 	 *
 	 * Note that this seems to be independent of TAS (Task Aborted Status)
 	 * in the Control Mode Page.
 	 */
 	spin_lock_irqsave(&dev->execute_task_lock, flags);
 	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
 				t_state_list) {
 		if (!task->task_se_cmd) {
 			pr_err("task->task_se_cmd is NULL!\n");
 			continue;
 		}
 		cmd = task->task_se_cmd;

 		/*
 		 * For PREEMPT_AND_ABORT usage, only process commands
 		 * with a matching reservation key.
 		 */
 		if (preempt_and_abort_list &&
 		    (core_scsi3_check_cdb_abort_and_preempt(
 					preempt_and_abort_list, cmd) != 0))
 			continue;
 		/*
 		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
 		 */
 		if (prout_cmd == cmd)
 			continue;

 		list_del(&task->t_state_list);
 		atomic_set(&task->task_state_active, 0);
 		spin_unlock_irqrestore(&dev->execute_task_lock, flags);

 		spin_lock_irqsave(&cmd->t_state_lock, flags);
 		pr_debug("LUN_RESET: %s cmd: %p task: %p"
 			" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
 			"def_t_state: %d/%d cdb: 0x%02x\n",
 			(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
 			cmd->se_tfo->get_task_tag(cmd), 0,
 			cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
 			cmd->deferred_t_state, cmd->t_task_cdb[0]);
 		pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
 			" t_task_cdbs: %d t_task_cdbs_left: %d"
 			" t_task_cdbs_sent: %d -- t_transport_active: %d"
 			" t_transport_stop: %d t_transport_sent: %d\n",
 			cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
 			cmd->t_task_list_num,
 			atomic_read(&cmd->t_task_cdbs_left),
 			atomic_read(&cmd->t_task_cdbs_sent),
 			atomic_read(&cmd->t_transport_active),
 			atomic_read(&cmd->t_transport_stop),
 			atomic_read(&cmd->t_transport_sent));

 		if (atomic_read(&task->task_active)) {
 			atomic_set(&task->task_stop, 1);
 			spin_unlock_irqrestore(
 				&cmd->t_state_lock, flags);

 			pr_debug("LUN_RESET: Waiting for task: %p to shutdown"
 				" for dev: %p\n", task, dev);
 			wait_for_completion(&task->task_stop_comp);
 			pr_debug("LUN_RESET Completed task: %p shutdown for"
 				" dev: %p\n", task, dev);
 			spin_lock_irqsave(&cmd->t_state_lock, flags);
 			atomic_dec(&cmd->t_task_cdbs_left);

 			atomic_set(&task->task_active, 0);
 			atomic_set(&task->task_stop, 0);
 		} else {
 			if (atomic_read(&task->task_execute_queue) != 0)
 				transport_remove_task_from_execute_queue(task, dev);
 		}
 		__transport_stop_task_timer(task, &flags);

 		if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
 			spin_unlock_irqrestore(
 					&cmd->t_state_lock, flags);
 			pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
 				" t_task_cdbs_ex_left: %d\n", task, dev,
 				atomic_read(&cmd->t_task_cdbs_ex_left));

 			spin_lock_irqsave(&dev->execute_task_lock, flags);
 			continue;
 		}
 		fe_count = atomic_read(&cmd->t_fe_count);

 		if (atomic_read(&cmd->t_transport_active)) {
 			pr_debug("LUN_RESET: got t_transport_active = 1 for"
 				" task: %p, t_fe_count: %d dev: %p\n", task,
 				fe_count, dev);
 			atomic_set(&cmd->t_transport_aborted, 1);
 			spin_unlock_irqrestore(&cmd->t_state_lock,
 						flags);
 			core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);

 			spin_lock_irqsave(&dev->execute_task_lock, flags);
 			continue;
 		}
 		pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
 			" t_fe_count: %d dev: %p\n", task, fe_count, dev);
 		atomic_set(&cmd->t_transport_aborted, 1);
 		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);

 		spin_lock_irqsave(&dev->execute_task_lock, flags);
 	}
 	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 	/*
 	 * Release all commands remaining in the struct se_device cmd queue.
 	 *
 	 * This follows the same logic as above for the struct se_device
 	 * struct se_task state list, where commands are returned with
 	 * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
 	 * reference, otherwise the struct se_cmd is released.
 	 */
 	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 	list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
 		/*
 		 * For PREEMPT_AND_ABORT usage, only process commands
 		 * with a matching reservation key.
 		 */
 		if (preempt_and_abort_list &&
 		    (core_scsi3_check_cdb_abort_and_preempt(
 					preempt_and_abort_list, cmd) != 0))
 			continue;
 		/*
 		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
 		 */
 		if (prout_cmd == cmd)
 			continue;

 		atomic_dec(&cmd->t_transport_queue_active);
 		atomic_dec(&qobj->queue_cnt);
 		list_del(&cmd->se_queue_node);
 		spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);

 		pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
 			" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
 			"Preempt" : "", cmd, cmd->t_state,
 			atomic_read(&cmd->t_fe_count));
 		/*
 		 * Signal that the command has failed via cmd->se_cmd_flags,
 		 */
 		transport_new_cmd_failure(cmd);

 		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
 				atomic_read(&cmd->t_fe_count));
 		spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
 	}
 	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
 	/*
 	 * Clear any legacy SPC-2 reservation when called during
 	 * LOGICAL UNIT RESET
 	 */
 	if (!preempt_and_abort_list &&
 	     (dev->dev_flags & DF_SPC2_RESERVATIONS)) {
 		spin_lock(&dev->dev_reservation_lock);
 		dev->dev_reserved_node_acl = NULL;
 		dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
 		spin_unlock(&dev->dev_reservation_lock);
 		pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
 	}

 	spin_lock_irq(&dev->stats_lock);
 	dev->num_resets++;
 	spin_unlock_irq(&dev->stats_lock);

 	pr_debug("LUN_RESET: %s for [%s] Complete\n",
 			(preempt_and_abort_list) ? "Preempt" : "TMR",
 			dev->transport->name);
 	return 0;
 }
	/*******************************************************************************
	* Filename: target_core_tmr.c
	*
	* This file contains SPC-3 task management infrastructure
	*
	* Copyright (c) 2009,2010 Rising Tide Systems
	* Copyright (c) 2009,2010 Linux-iSCSI.org
	*
	* Nicholas A. Bellinger <nab@kernel.org>
	*
	* This program 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; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program 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 this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*
	******************************************************************************/

	#include <linux/version.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/list.h>
	#include <scsi/scsi.h>
	#include <scsi/scsi_cmnd.h>

	#include <target/target_core_base.h>
	#include <target/target_core_device.h>
	#include <target/target_core_tmr.h>
	#include <target/target_core_transport.h>
	#include <target/target_core_fabric_ops.h>
	#include <target/target_core_configfs.h>

	#include "target_core_alua.h"
	#include "target_core_pr.h"

	struct se_tmr_req *core_tmr_alloc_req(
	struct se_cmd *se_cmd,
	void *fabric_tmr_ptr,
	u8 function)
	{
	struct se_tmr_req *tmr;

	tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
	GFP_ATOMIC : GFP_KERNEL);
	if (!tmr) {
	pr_err("Unable to allocate struct se_tmr_req\n");
	return ERR_PTR(-ENOMEM);
	}
	tmr->task_cmd = se_cmd;
	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	tmr->function = function;
	INIT_LIST_HEAD(&tmr->tmr_list);

	return tmr;
	}
	EXPORT_SYMBOL(core_tmr_alloc_req);

	void core_tmr_release_req(
	struct se_tmr_req *tmr)
	{
	struct se_device *dev = tmr->tmr_dev;

	if (!dev) {
	kmem_cache_free(se_tmr_req_cache, tmr);
	return;
	}

	spin_lock_irq(&dev->se_tmr_lock);
	list_del(&tmr->tmr_list);
	spin_unlock_irq(&dev->se_tmr_lock);

	kmem_cache_free(se_tmr_req_cache, tmr);
	}

	static void core_tmr_handle_tas_abort(
	struct se_node_acl *tmr_nacl,
	struct se_cmd *cmd,
	int tas,
	int fe_count)
	{
	if (!fe_count) {
	transport_cmd_finish_abort(cmd, 1);
	return;
	}
	/*
	* TASK ABORTED status (TAS) bit support
	*/
	if ((tmr_nacl &&
	(tmr_nacl == cmd->se_sess->se_node_acl)) \|\| tas)
	transport_send_task_abort(cmd);

	transport_cmd_finish_abort(cmd, 0);
	}

	int core_tmr_lun_reset(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct list_head *preempt_and_abort_list,
	struct se_cmd *prout_cmd)
	{
	struct se_cmd cmd, tcmd;
	struct se_node_acl *tmr_nacl = NULL;
	struct se_portal_group *tmr_tpg = NULL;
	struct se_queue_obj *qobj = &dev->dev_queue_obj;
	struct se_tmr_req tmr_p, tmr_pp;
	struct se_task task, task_tmp;
	unsigned long flags;
	int fe_count, tas;
	/*
	* TASK_ABORTED status bit, this is configurable via ConfigFS
	* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
	*
	* A task aborted status (TAS) bit set to zero specifies that aborted
	* tasks shall be terminated by the device server without any response
	* to the application client. A TAS bit set to one specifies that tasks
	* aborted by the actions of an I_T nexus other than the I_T nexus on
	* which the command was received shall be completed with TASK ABORTED
	* status (see SAM-4).
	*/
	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
	/*
	* Determine if this se_tmr is coming from a $FABRIC_MOD
	* or struct se_device passthrough..
	*/
	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
	tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
	tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
	if (tmr_nacl && tmr_tpg) {
	pr_debug("LUN_RESET: TMR caller fabric: %s"
	" initiator port %s\n",
	tmr_tpg->se_tpg_tfo->get_fabric_name(),
	tmr_nacl->initiatorname);
	}
	}
	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
	(preempt_and_abort_list) ? "Preempt" : "TMR",
	dev->transport->name, tas);
	/*
	* Release all pending and outgoing TMRs aside from the received
	* LUN_RESET tmr..
	*/
	spin_lock_irq(&dev->se_tmr_lock);
	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
	/*
	* Allow the received TMR to return with FUNCTION_COMPLETE.
	*/
	if (tmr && (tmr_p == tmr))
	continue;

	cmd = tmr_p->task_cmd;
	if (!cmd) {
	pr_err("Unable to locate struct se_cmd for TMR\n");
	continue;
	}
	/*
	* If this function was called with a valid pr_res_key
	* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
	* skip non regisration key matching TMRs.
	*/
	if (preempt_and_abort_list &&
	(core_scsi3_check_cdb_abort_and_preempt(
	preempt_and_abort_list, cmd) != 0))
	continue;
	spin_unlock_irq(&dev->se_tmr_lock);

	spin_lock_irqsave(&cmd->t_state_lock, flags);
	if (!atomic_read(&cmd->t_transport_active)) {
	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
	spin_lock_irq(&dev->se_tmr_lock);
	continue;
	}
	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
	spin_lock_irq(&dev->se_tmr_lock);
	continue;
	}
	pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
	" Response: 0x%02x, t_state: %d\n",
	(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
	tmr_p->function, tmr_p->response, cmd->t_state);
	spin_unlock_irqrestore(&cmd->t_state_lock, flags);

	transport_cmd_finish_abort_tmr(cmd);
	spin_lock_irq(&dev->se_tmr_lock);
	}
	spin_unlock_irq(&dev->se_tmr_lock);
	/*
	* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
	* This is following sam4r17, section 5.6 Aborting commands, Table 38
	* for TMR LUN_RESET:
	*
	* a) "Yes" indicates that each command that is aborted on an I_T nexus
	* other than the one that caused the SCSI device condition is
	* completed with TASK ABORTED status, if the TAS bit is set to one in
	* the Control mode page (see SPC-4). "No" indicates that no status is
	* returned for aborted commands.
	*
	* d) If the logical unit reset is caused by a particular I_T nexus
	* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
	* (TASK_ABORTED status) applies.
	*
	* Otherwise (e.g., if triggered by a hard reset), "no"
	* (no TASK_ABORTED SAM status) applies.
	*
	* Note that this seems to be independent of TAS (Task Aborted Status)
	* in the Control Mode Page.
	*/
	spin_lock_irqsave(&dev->execute_task_lock, flags);
	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
	t_state_list) {
	if (!task->task_se_cmd) {
	pr_err("task->task_se_cmd is NULL!\n");
	continue;
	}
	cmd = task->task_se_cmd;

	/*
	* For PREEMPT_AND_ABORT usage, only process commands
	* with a matching reservation key.
	*/
	if (preempt_and_abort_list &&
	(core_scsi3_check_cdb_abort_and_preempt(
	preempt_and_abort_list, cmd) != 0))
	continue;
	/*
	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	*/
	if (prout_cmd == cmd)
	continue;

	list_del(&task->t_state_list);
	atomic_set(&task->task_state_active, 0);
	spin_unlock_irqrestore(&dev->execute_task_lock, flags);

	spin_lock_irqsave(&cmd->t_state_lock, flags);
	pr_debug("LUN_RESET: %s cmd: %p task: %p"
	" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
	"def_t_state: %d/%d cdb: 0x%02x\n",
	(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
	cmd->se_tfo->get_task_tag(cmd), 0,
	cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
	cmd->deferred_t_state, cmd->t_task_cdb[0]);
	pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
	" t_task_cdbs: %d t_task_cdbs_left: %d"
	" t_task_cdbs_sent: %d -- t_transport_active: %d"
	" t_transport_stop: %d t_transport_sent: %d\n",
	cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
	cmd->t_task_list_num,
	atomic_read(&cmd->t_task_cdbs_left),
	atomic_read(&cmd->t_task_cdbs_sent),
	atomic_read(&cmd->t_transport_active),
	atomic_read(&cmd->t_transport_stop),
	atomic_read(&cmd->t_transport_sent));

	if (atomic_read(&task->task_active)) {
	atomic_set(&task->task_stop, 1);
	spin_unlock_irqrestore(
	&cmd->t_state_lock, flags);

	pr_debug("LUN_RESET: Waiting for task: %p to shutdown"
	" for dev: %p\n", task, dev);
	wait_for_completion(&task->task_stop_comp);
	pr_debug("LUN_RESET Completed task: %p shutdown for"
	" dev: %p\n", task, dev);
	spin_lock_irqsave(&cmd->t_state_lock, flags);
	atomic_dec(&cmd->t_task_cdbs_left);

	atomic_set(&task->task_active, 0);
	atomic_set(&task->task_stop, 0);
	} else {
	if (atomic_read(&task->task_execute_queue) != 0)
	transport_remove_task_from_execute_queue(task, dev);
	}
	__transport_stop_task_timer(task, &flags);

	if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
	spin_unlock_irqrestore(
	&cmd->t_state_lock, flags);
	pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
	" t_task_cdbs_ex_left: %d\n", task, dev,
	atomic_read(&cmd->t_task_cdbs_ex_left));

	spin_lock_irqsave(&dev->execute_task_lock, flags);
	continue;
	}
	fe_count = atomic_read(&cmd->t_fe_count);

	if (atomic_read(&cmd->t_transport_active)) {
	pr_debug("LUN_RESET: got t_transport_active = 1 for"
	" task: %p, t_fe_count: %d dev: %p\n", task,
	fe_count, dev);
	atomic_set(&cmd->t_transport_aborted, 1);
	spin_unlock_irqrestore(&cmd->t_state_lock,
	flags);
	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);

	spin_lock_irqsave(&dev->execute_task_lock, flags);
	continue;
	}
	pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
	" t_fe_count: %d dev: %p\n", task, fe_count, dev);
	atomic_set(&cmd->t_transport_aborted, 1);
	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);

	spin_lock_irqsave(&dev->execute_task_lock, flags);
	}
	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	/*
	* Release all commands remaining in the struct se_device cmd queue.
	*
	* This follows the same logic as above for the struct se_device
	* struct se_task state list, where commands are returned with
	* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
	* reference, otherwise the struct se_cmd is released.
	*/
	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
	/*
	* For PREEMPT_AND_ABORT usage, only process commands
	* with a matching reservation key.
	*/
	if (preempt_and_abort_list &&
	(core_scsi3_check_cdb_abort_and_preempt(
	preempt_and_abort_list, cmd) != 0))
	continue;
	/*
	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	*/
	if (prout_cmd == cmd)
	continue;

	atomic_dec(&cmd->t_transport_queue_active);
	atomic_dec(&qobj->queue_cnt);
	list_del(&cmd->se_queue_node);
	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);

	pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
	" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
	"Preempt" : "", cmd, cmd->t_state,
	atomic_read(&cmd->t_fe_count));
	/*
	* Signal that the command has failed via cmd->se_cmd_flags,
	*/
	transport_new_cmd_failure(cmd);

	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
	atomic_read(&cmd->t_fe_count));
	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	}
	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
	/*
	* Clear any legacy SPC-2 reservation when called during
	* LOGICAL UNIT RESET
	*/
	if (!preempt_and_abort_list &&
	(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
	spin_lock(&dev->dev_reservation_lock);
	dev->dev_reserved_node_acl = NULL;
	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
	spin_unlock(&dev->dev_reservation_lock);
	pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
	}

	spin_lock_irq(&dev->stats_lock);
	dev->num_resets++;
	spin_unlock_irq(&dev->stats_lock);

	pr_debug("LUN_RESET: %s for [%s] Complete\n",
	(preempt_and_abort_list) ? "Preempt" : "TMR",
	dev->transport->name);
	return 0;
	}