[deliverable/linux.git] / drivers / target / target_core_ua.c

/*******************************************************************************
 * Filename: target_core_ua.c
 *
 * This file contains logic for SPC-3 Unit Attention emulation
 *
 * (c) Copyright 2009-2013 Datera, Inc.
 *
 * 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/slab.h>
#include <linux/spinlock.h>
#include <scsi/scsi_proto.h>

#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>

#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"
#include "target_core_ua.h"

sense_reason_t
target_scsi3_ua_check(struct se_cmd *cmd)
{
	struct se_dev_entry *deve;
	struct se_session *sess = cmd->se_sess;
	struct se_node_acl *nacl;

	if (!sess)
		return 0;

	nacl = sess->se_node_acl;
	if (!nacl)
		return 0;

	deve = nacl->device_list[cmd->orig_fe_lun];
	if (!atomic_read(&deve->ua_count))
		return 0;
	/*
	 * From sam4r14, section 5.14 Unit attention condition:
	 *
	 * a) if an INQUIRY command enters the enabled command state, the
	 *    device server shall process the INQUIRY command and shall neither
	 *    report nor clear any unit attention condition;
	 * b) if a REPORT LUNS command enters the enabled command state, the
	 *    device server shall process the REPORT LUNS command and shall not
	 *    report any unit attention condition;
	 * e) if a REQUEST SENSE command enters the enabled command state while
	 *    a unit attention condition exists for the SCSI initiator port
	 *    associated with the I_T nexus on which the REQUEST SENSE command
	 *    was received, then the device server shall process the command
	 *    and either:
	 */
	switch (cmd->t_task_cdb[0]) {
	case INQUIRY:
	case REPORT_LUNS:
	case REQUEST_SENSE:
		return 0;
	default:
		return TCM_CHECK_CONDITION_UNIT_ATTENTION;
	}
}

int core_scsi3_ua_allocate(
	struct se_node_acl *nacl,
	u32 unpacked_lun,
	u8 asc,
	u8 ascq)
{
	struct se_dev_entry *deve;
	struct se_ua *ua, *ua_p, *ua_tmp;
	/*
	 * PASSTHROUGH OPS
	 */
	if (!nacl)
		return -EINVAL;

	ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC);
	if (!ua) {
		pr_err("Unable to allocate struct se_ua\n");
		return -ENOMEM;
	}
	INIT_LIST_HEAD(&ua->ua_nacl_list);

	ua->ua_nacl = nacl;
	ua->ua_asc = asc;
	ua->ua_ascq = ascq;

	spin_lock_irq(&nacl->device_list_lock);
	deve = nacl->device_list[unpacked_lun];

	spin_lock(&deve->ua_lock);
	list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) {
		/*
		 * Do not report the same UNIT ATTENTION twice..
		 */
		if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) {
			spin_unlock(&deve->ua_lock);
			spin_unlock_irq(&nacl->device_list_lock);
			kmem_cache_free(se_ua_cache, ua);
			return 0;
		}
		/*
		 * Attach the highest priority Unit Attention to
		 * the head of the list following sam4r14,
		 * Section 5.14 Unit Attention Condition:
		 *
		 * POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest
		 * POWER ON OCCURRED or
		 * DEVICE INTERNAL RESET
		 * SCSI BUS RESET OCCURRED or
		 * MICROCODE HAS BEEN CHANGED or
		 * protocol specific
		 * BUS DEVICE RESET FUNCTION OCCURRED
		 * I_T NEXUS LOSS OCCURRED
		 * COMMANDS CLEARED BY POWER LOSS NOTIFICATION
		 * all others                                    Lowest
		 *
		 * Each of the ASCQ codes listed above are defined in
		 * the 29h ASC family, see spc4r17 Table D.1
		 */
		if (ua_p->ua_asc == 0x29) {
			if ((asc == 0x29) && (ascq > ua_p->ua_ascq))
				list_add(&ua->ua_nacl_list,
						&deve->ua_list);
			else
				list_add_tail(&ua->ua_nacl_list,
						&deve->ua_list);
		} else if (ua_p->ua_asc == 0x2a) {
			/*
			 * Incoming Family 29h ASCQ codes will override
			 * Family 2AHh ASCQ codes for Unit Attention condition.
			 */
			if ((asc == 0x29) || (ascq > ua_p->ua_asc))
				list_add(&ua->ua_nacl_list,
					&deve->ua_list);
			else
				list_add_tail(&ua->ua_nacl_list,
						&deve->ua_list);
		} else
			list_add_tail(&ua->ua_nacl_list,
				&deve->ua_list);
		spin_unlock(&deve->ua_lock);
		spin_unlock_irq(&nacl->device_list_lock);

		atomic_inc_mb(&deve->ua_count);
		return 0;
	}
	list_add_tail(&ua->ua_nacl_list, &deve->ua_list);
	spin_unlock(&deve->ua_lock);
	spin_unlock_irq(&nacl->device_list_lock);

	pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:"
		" 0x%02x, ASCQ: 0x%02x\n",
		nacl->se_tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
		asc, ascq);

	atomic_inc_mb(&deve->ua_count);
	return 0;
}

void core_scsi3_ua_release_all(
	struct se_dev_entry *deve)
{
	struct se_ua *ua, *ua_p;

	spin_lock(&deve->ua_lock);
	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
		list_del(&ua->ua_nacl_list);
		kmem_cache_free(se_ua_cache, ua);

		atomic_dec_mb(&deve->ua_count);
	}
	spin_unlock(&deve->ua_lock);
}

void core_scsi3_ua_for_check_condition(
	struct se_cmd *cmd,
	u8 *asc,
	u8 *ascq)
{
	struct se_device *dev = cmd->se_dev;
	struct se_dev_entry *deve;
	struct se_session *sess = cmd->se_sess;
	struct se_node_acl *nacl;
	struct se_ua *ua = NULL, *ua_p;
	int head = 1;

	if (!sess)
		return;

	nacl = sess->se_node_acl;
	if (!nacl)
		return;

	spin_lock_irq(&nacl->device_list_lock);
	deve = nacl->device_list[cmd->orig_fe_lun];
	if (!atomic_read(&deve->ua_count)) {
		spin_unlock_irq(&nacl->device_list_lock);
		return;
	}
	/*
	 * The highest priority Unit Attentions are placed at the head of the
	 * struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION +
	 * sense data for the received CDB.
	 */
	spin_lock(&deve->ua_lock);
	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
		/*
		 * For ua_intlck_ctrl code not equal to 00b, only report the
		 * highest priority UNIT_ATTENTION and ASC/ASCQ without
		 * clearing it.
		 */
		if (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) {
			*asc = ua->ua_asc;
			*ascq = ua->ua_ascq;
			break;
		}
		/*
		 * Otherwise for the default 00b, release the UNIT ATTENTION
		 * condition.  Return the ASC/ASCQ of the highest priority UA
		 * (head of the list) in the outgoing CHECK_CONDITION + sense.
		 */
		if (head) {
			*asc = ua->ua_asc;
			*ascq = ua->ua_ascq;
			head = 0;
		}
		list_del(&ua->ua_nacl_list);
		kmem_cache_free(se_ua_cache, ua);

		atomic_dec_mb(&deve->ua_count);
	}
	spin_unlock(&deve->ua_lock);
	spin_unlock_irq(&nacl->device_list_lock);

	pr_debug("[%s]: %s UNIT ATTENTION condition with"
		" INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x"
		" reported ASC: 0x%02x, ASCQ: 0x%02x\n",
		nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
		(dev->dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" :
		"Releasing", dev->dev_attrib.emulate_ua_intlck_ctrl,
		cmd->orig_fe_lun, cmd->t_task_cdb[0], *asc, *ascq);
}

int core_scsi3_ua_clear_for_request_sense(
	struct se_cmd *cmd,
	u8 *asc,
	u8 *ascq)
{
	struct se_dev_entry *deve;
	struct se_session *sess = cmd->se_sess;
	struct se_node_acl *nacl;
	struct se_ua *ua = NULL, *ua_p;
	int head = 1;

	if (!sess)
		return -EINVAL;

	nacl = sess->se_node_acl;
	if (!nacl)
		return -EINVAL;

	spin_lock_irq(&nacl->device_list_lock);
	deve = nacl->device_list[cmd->orig_fe_lun];
	if (!atomic_read(&deve->ua_count)) {
		spin_unlock_irq(&nacl->device_list_lock);
		return -EPERM;
	}
	/*
	 * The highest priority Unit Attentions are placed at the head of the
	 * struct se_dev_entry->ua_list.  The First (and hence highest priority)
	 * ASC/ASCQ will be returned in REQUEST_SENSE payload data for the
	 * matching struct se_lun.
	 *
	 * Once the returning ASC/ASCQ values are set, we go ahead and
	 * release all of the Unit Attention conditions for the associated
	 * struct se_lun.
	 */
	spin_lock(&deve->ua_lock);
	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
		if (head) {
			*asc = ua->ua_asc;
			*ascq = ua->ua_ascq;
			head = 0;
		}
		list_del(&ua->ua_nacl_list);
		kmem_cache_free(se_ua_cache, ua);

		atomic_dec_mb(&deve->ua_count);
	}
	spin_unlock(&deve->ua_lock);
	spin_unlock_irq(&nacl->device_list_lock);

	pr_debug("[%s]: Released UNIT ATTENTION condition, mapped"
		" LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x,"
		" ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
		cmd->orig_fe_lun, *asc, *ascq);

	return (head) ? -EPERM : 0;
}
Commit	Line	Data
c66ac9db NB	1	/*******************************************************************************
	2	* Filename: target_core_ua.c
	3	*
	4	* This file contains logic for SPC-3 Unit Attention emulation
	5	*
4c76251e	6	* (c) Copyright 2009-2013 Datera, Inc.
c66ac9db NB	7	*
	8	* Nicholas A. Bellinger <nab@kernel.org>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	23	*
	24	******************************************************************************/
	25
c66ac9db NB	26	#include <linux/slab.h>
c66ac9db NB	27	#include <linux/spinlock.h>
ba929992	28	#include <scsi/scsi_proto.h>
c66ac9db NB	29
c66ac9db NB	30	#include <target/target_core_base.h>
c4795fb2	31	#include <target/target_core_fabric.h>
c66ac9db NB	32	#include <target/target_core_configfs.h>
c66ac9db NB	33
e26d99ae	34	#include "target_core_internal.h"
c66ac9db	35	#include "target_core_alua.h"
c66ac9db NB	36	#include "target_core_pr.h"
	37	#include "target_core_ua.h"
	38
de103c93 CH	39	sense_reason_t
de103c93 CH	40	target_scsi3_ua_check(struct se_cmd *cmd)
c66ac9db NB	41	{
	42	struct se_dev_entry *deve;
	43	struct se_session *sess = cmd->se_sess;
	44	struct se_node_acl *nacl;
	45
6708bb27	46	if (!sess)
c66ac9db NB	47	return 0;
	48
	49	nacl = sess->se_node_acl;
6708bb27	50	if (!nacl)
c66ac9db NB	51	return 0;
c66ac9db NB	52
f2083241	53	deve = nacl->device_list[cmd->orig_fe_lun];
6708bb27	54	if (!atomic_read(&deve->ua_count))
c66ac9db NB	55	return 0;
	56	/*
	57	* From sam4r14, section 5.14 Unit attention condition:
	58	*
	59	* a) if an INQUIRY command enters the enabled command state, the
	60	* device server shall process the INQUIRY command and shall neither
	61	* report nor clear any unit attention condition;
	62	* b) if a REPORT LUNS command enters the enabled command state, the
	63	* device server shall process the REPORT LUNS command and shall not
	64	* report any unit attention condition;
	65	* e) if a REQUEST SENSE command enters the enabled command state while
	66	* a unit attention condition exists for the SCSI initiator port
	67	* associated with the I_T nexus on which the REQUEST SENSE command
	68	* was received, then the device server shall process the command
	69	* and either:
	70	*/
de103c93	71	switch (cmd->t_task_cdb[0]) {
c66ac9db NB	72	case INQUIRY:
	73	case REPORT_LUNS:
	74	case REQUEST_SENSE:
	75	return 0;
	76	default:
de103c93	77	return TCM_CHECK_CONDITION_UNIT_ATTENTION;
c66ac9db	78	}
c66ac9db NB	79	}
	80
	81	int core_scsi3_ua_allocate(
	82	struct se_node_acl *nacl,
	83	u32 unpacked_lun,
	84	u8 asc,
	85	u8 ascq)
	86	{
	87	struct se_dev_entry *deve;
	88	struct se_ua ua, ua_p, *ua_tmp;
	89	/*
	90	* PASSTHROUGH OPS
	91	*/
6708bb27	92	if (!nacl)
e3d6f909	93	return -EINVAL;
c66ac9db NB	94
c66ac9db NB	95	ua = kmem_cache_zalloc(se_ua_cache, GFP_ATOMIC);
6708bb27 AG	96	if (!ua) {
6708bb27 AG	97	pr_err("Unable to allocate struct se_ua\n");
e3d6f909	98	return -ENOMEM;
c66ac9db	99	}
c66ac9db NB	100	INIT_LIST_HEAD(&ua->ua_nacl_list);
	101
	102	ua->ua_nacl = nacl;
	103	ua->ua_asc = asc;
	104	ua->ua_ascq = ascq;
	105
	106	spin_lock_irq(&nacl->device_list_lock);
f2083241	107	deve = nacl->device_list[unpacked_lun];
c66ac9db NB	108
	109	spin_lock(&deve->ua_lock);
	110	list_for_each_entry_safe(ua_p, ua_tmp, &deve->ua_list, ua_nacl_list) {
	111	/*
	112	* Do not report the same UNIT ATTENTION twice..
	113	*/
	114	if ((ua_p->ua_asc == asc) && (ua_p->ua_ascq == ascq)) {
	115	spin_unlock(&deve->ua_lock);
	116	spin_unlock_irq(&nacl->device_list_lock);
	117	kmem_cache_free(se_ua_cache, ua);
	118	return 0;
	119	}
	120	/*
	121	* Attach the highest priority Unit Attention to
	122	* the head of the list following sam4r14,
	123	* Section 5.14 Unit Attention Condition:
	124	*
	125	* POWER ON, RESET, OR BUS DEVICE RESET OCCURRED highest
	126	* POWER ON OCCURRED or
	127	* DEVICE INTERNAL RESET
	128	* SCSI BUS RESET OCCURRED or
	129	* MICROCODE HAS BEEN CHANGED or
	130	* protocol specific
	131	* BUS DEVICE RESET FUNCTION OCCURRED
	132	* I_T NEXUS LOSS OCCURRED
	133	* COMMANDS CLEARED BY POWER LOSS NOTIFICATION
	134	* all others Lowest
	135	*
	136	* Each of the ASCQ codes listed above are defined in
	137	* the 29h ASC family, see spc4r17 Table D.1
	138	*/
	139	if (ua_p->ua_asc == 0x29) {
	140	if ((asc == 0x29) && (ascq > ua_p->ua_ascq))
	141	list_add(&ua->ua_nacl_list,
	142	&deve->ua_list);
	143	else
	144	list_add_tail(&ua->ua_nacl_list,
	145	&deve->ua_list);
	146	} else if (ua_p->ua_asc == 0x2a) {
	147	/*
	148	* Incoming Family 29h ASCQ codes will override
	149	* Family 2AHh ASCQ codes for Unit Attention condition.
	150	*/
	151	if ((asc == 0x29) \|\| (ascq > ua_p->ua_asc))
	152	list_add(&ua->ua_nacl_list,
	153	&deve->ua_list);
	154	else
	155	list_add_tail(&ua->ua_nacl_list,
	156	&deve->ua_list);
	157	} else
	158	list_add_tail(&ua->ua_nacl_list,
	159	&deve->ua_list);
	160	spin_unlock(&deve->ua_lock);
	161	spin_unlock_irq(&nacl->device_list_lock);
	162
33940d09	163	atomic_inc_mb(&deve->ua_count);
c66ac9db NB	164	return 0;
	165	}
	166	list_add_tail(&ua->ua_nacl_list, &deve->ua_list);
	167	spin_unlock(&deve->ua_lock);
	168	spin_unlock_irq(&nacl->device_list_lock);
	169
6708bb27	170	pr_debug("[%s]: Allocated UNIT ATTENTION, mapped LUN: %u, ASC:"
c66ac9db	171	" 0x%02x, ASCQ: 0x%02x\n",
e3d6f909	172	nacl->se_tpg->se_tpg_tfo->get_fabric_name(), unpacked_lun,
c66ac9db NB	173	asc, ascq);
c66ac9db NB	174
33940d09	175	atomic_inc_mb(&deve->ua_count);
c66ac9db NB	176	return 0;
	177	}
	178
	179	void core_scsi3_ua_release_all(
	180	struct se_dev_entry *deve)
	181	{
	182	struct se_ua ua, ua_p;
	183
	184	spin_lock(&deve->ua_lock);
	185	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
	186	list_del(&ua->ua_nacl_list);
	187	kmem_cache_free(se_ua_cache, ua);
	188
33940d09	189	atomic_dec_mb(&deve->ua_count);
c66ac9db NB	190	}
	191	spin_unlock(&deve->ua_lock);
	192	}
	193
	194	void core_scsi3_ua_for_check_condition(
	195	struct se_cmd *cmd,
	196	u8 *asc,
	197	u8 *ascq)
	198	{
5951146d	199	struct se_device *dev = cmd->se_dev;
c66ac9db NB	200	struct se_dev_entry *deve;
	201	struct se_session *sess = cmd->se_sess;
	202	struct se_node_acl *nacl;
	203	struct se_ua ua = NULL, ua_p;
	204	int head = 1;
	205
6708bb27	206	if (!sess)
c66ac9db NB	207	return;
	208
	209	nacl = sess->se_node_acl;
6708bb27	210	if (!nacl)
c66ac9db NB	211	return;
	212
	213	spin_lock_irq(&nacl->device_list_lock);
f2083241	214	deve = nacl->device_list[cmd->orig_fe_lun];
6708bb27	215	if (!atomic_read(&deve->ua_count)) {
c66ac9db NB	216	spin_unlock_irq(&nacl->device_list_lock);
	217	return;
	218	}
	219	/*
	220	* The highest priority Unit Attentions are placed at the head of the
	221	* struct se_dev_entry->ua_list, and will be returned in CHECK_CONDITION +
	222	* sense data for the received CDB.
	223	*/
	224	spin_lock(&deve->ua_lock);
	225	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
	226	/*
	227	* For ua_intlck_ctrl code not equal to 00b, only report the
	228	* highest priority UNIT_ATTENTION and ASC/ASCQ without
	229	* clearing it.
	230	*/
0fd97ccf	231	if (dev->dev_attrib.emulate_ua_intlck_ctrl != 0) {
c66ac9db NB	232	*asc = ua->ua_asc;
	233	*ascq = ua->ua_ascq;
	234	break;
	235	}
	236	/*
	237	* Otherwise for the default 00b, release the UNIT ATTENTION
25985edc	238	* condition. Return the ASC/ASCQ of the highest priority UA
c66ac9db NB	239	* (head of the list) in the outgoing CHECK_CONDITION + sense.
	240	*/
	241	if (head) {
	242	*asc = ua->ua_asc;
	243	*ascq = ua->ua_ascq;
	244	head = 0;
	245	}
	246	list_del(&ua->ua_nacl_list);
	247	kmem_cache_free(se_ua_cache, ua);
	248
33940d09	249	atomic_dec_mb(&deve->ua_count);
c66ac9db NB	250	}
	251	spin_unlock(&deve->ua_lock);
	252	spin_unlock_irq(&nacl->device_list_lock);
	253
6708bb27	254	pr_debug("[%s]: %s UNIT ATTENTION condition with"
c66ac9db NB	255	" INTLCK_CTRL: %d, mapped LUN: %u, got CDB: 0x%02x"
c66ac9db NB	256	" reported ASC: 0x%02x, ASCQ: 0x%02x\n",
e3d6f909	257	nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
0fd97ccf CH	258	(dev->dev_attrib.emulate_ua_intlck_ctrl != 0) ? "Reporting" :
0fd97ccf CH	259	"Releasing", dev->dev_attrib.emulate_ua_intlck_ctrl,
a1d8b49a	260	cmd->orig_fe_lun, cmd->t_task_cdb[0], asc, ascq);
c66ac9db NB	261	}
	262
	263	int core_scsi3_ua_clear_for_request_sense(
	264	struct se_cmd *cmd,
	265	u8 *asc,
	266	u8 *ascq)
	267	{
	268	struct se_dev_entry *deve;
	269	struct se_session *sess = cmd->se_sess;
	270	struct se_node_acl *nacl;
	271	struct se_ua ua = NULL, ua_p;
	272	int head = 1;
	273
6708bb27	274	if (!sess)
e3d6f909	275	return -EINVAL;
c66ac9db NB	276
c66ac9db NB	277	nacl = sess->se_node_acl;
6708bb27	278	if (!nacl)
e3d6f909	279	return -EINVAL;
c66ac9db NB	280
c66ac9db NB	281	spin_lock_irq(&nacl->device_list_lock);
f2083241	282	deve = nacl->device_list[cmd->orig_fe_lun];
6708bb27	283	if (!atomic_read(&deve->ua_count)) {
c66ac9db	284	spin_unlock_irq(&nacl->device_list_lock);
e3d6f909	285	return -EPERM;
c66ac9db NB	286	}
	287	/*
	288	* The highest priority Unit Attentions are placed at the head of the
	289	* struct se_dev_entry->ua_list. The First (and hence highest priority)
	290	* ASC/ASCQ will be returned in REQUEST_SENSE payload data for the
	291	* matching struct se_lun.
	292	*
	293	* Once the returning ASC/ASCQ values are set, we go ahead and
25985edc	294	* release all of the Unit Attention conditions for the associated
c66ac9db NB	295	* struct se_lun.
	296	*/
	297	spin_lock(&deve->ua_lock);
	298	list_for_each_entry_safe(ua, ua_p, &deve->ua_list, ua_nacl_list) {
	299	if (head) {
	300	*asc = ua->ua_asc;
	301	*ascq = ua->ua_ascq;
	302	head = 0;
	303	}
	304	list_del(&ua->ua_nacl_list);
	305	kmem_cache_free(se_ua_cache, ua);
	306
33940d09	307	atomic_dec_mb(&deve->ua_count);
c66ac9db NB	308	}
	309	spin_unlock(&deve->ua_lock);
	310	spin_unlock_irq(&nacl->device_list_lock);
	311
6708bb27	312	pr_debug("[%s]: Released UNIT ATTENTION condition, mapped"
c66ac9db	313	" LUN: %u, got REQUEST_SENSE reported ASC: 0x%02x,"
e3d6f909	314	" ASCQ: 0x%02x\n", nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db NB	315	cmd->orig_fe_lun, asc, ascq);
c66ac9db NB	316
e3d6f909	317	return (head) ? -EPERM : 0;
c66ac9db	318	}