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Commit 3243f50b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 

Pull SCSI target fixes from Nicholas Bellinger:
 "This contains a v4.2-rc specific RCU module unload regression bug-fix,
  a long-standing iscsi-target bug-fix for duplicate target_xfer_tags
  during NOP processing from Alexei, and two more small REPORT_LUNs
  emulation related patches to make Solaris FC host LUN scanning happy
  from Roland.

  There is also one patch not included that allows target-core to limit
  the number of fabric driver SGLs per I/O request using residuals, that
  is currently required as a work-around for FC hosts which don't honor
  EVPD block-limits settings.  At this point, it will most likely become
  for-next material"

* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  target: Fix handling of small allocation lengths in REPORT LUNS
  target: REPORT LUNS should return LUN 0 even for dynamic ACLs
  target/iscsi: Fix double free of a TUR followed by a solicited NOPOUT
  target: Perform RCU callback barrier before backend/fabric unload
parents 3bd8f7d8 0f69a387

drivers/target/iscsi/iscsi_target.c

+2 −2
Original line number Diff line number Diff line
@@ -968,9 +968,9 @@ int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 
		cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;



	conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;

	if (hdr->flags & ISCSI_FLAG_CMD_READ) {

	if (hdr->flags & ISCSI_FLAG_CMD_READ)

		cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);

	} else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)

	else

		cmd->targ_xfer_tag = 0xFFFFFFFF;

	cmd->cmd_sn		= be32_to_cpu(hdr->cmdsn);

	cmd->exp_stat_sn	= be32_to_cpu(hdr->exp_statsn);

drivers/target/target_core_configfs.c

+8 −1
Original line number Diff line number Diff line
@@ -457,8 +457,15 @@ void target_unregister_template(const struct target_core_fabric_ops *fo) 
		if (!strcmp(t->tf_ops->name, fo->name)) {

			BUG_ON(atomic_read(&t->tf_access_cnt));

			list_del(&t->tf_list);

			mutex_unlock(&g_tf_lock);

			/*

			 * Wait for any outstanding fabric se_deve_entry->rcu_head

			 * callbacks to complete post kfree_rcu(), before allowing

			 * fabric driver unload of TFO->module to proceed.

			 */

			rcu_barrier();

			kfree(t);

			break;

			return;

		}

	}

	mutex_unlock(&g_tf_lock);

drivers/target/target_core_hba.c

+9 −1
Original line number Diff line number Diff line
@@ -84,8 +84,16 @@ void target_backend_unregister(const struct target_backend_ops *ops) 
	list_for_each_entry(tb, &backend_list, list) {

		if (tb->ops == ops) {

			list_del(&tb->list);

			mutex_unlock(&backend_mutex);

			/*

			 * Wait for any outstanding backend driver ->rcu_head

			 * callbacks to complete post TBO->free_device() ->

			 * call_rcu(), before allowing backend driver module

			 * unload of target_backend_ops->owner to proceed.

			 */

			rcu_barrier();

			kfree(tb);

			break;

			return;

		}

	}

	mutex_unlock(&backend_mutex);

drivers/target/target_core_spc.c

+25 −19
Original line number Diff line number Diff line
@@ -1203,17 +1203,13 @@ sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 
	struct se_dev_entry *deve;

	struct se_session *sess = cmd->se_sess;

	struct se_node_acl *nacl;

	struct scsi_lun slun;

	unsigned char *buf;

	u32 lun_count = 0, offset = 8;



	if (cmd->data_length < 16) {

		pr_warn("REPORT LUNS allocation length %u too small\n",

			cmd->data_length);

		return TCM_INVALID_CDB_FIELD;

	}

	__be32 len;



	buf = transport_kmap_data_sg(cmd);

	if (!buf)

	if (cmd->data_length && !buf)

		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;



	/*
@@ -1221,11 +1217,9 @@ sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 
	 * coming via a target_core_mod PASSTHROUGH op, and not through

	 * a $FABRIC_MOD.  In that case, report LUN=0 only.

	 */

	if (!sess) {

		int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);

		lun_count = 1;

	if (!sess)

		goto done;

	}



	nacl = sess->se_node_acl;



	rcu_read_lock();
@@ -1236,10 +1230,12 @@ sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 
		 * See SPC2-R20 7.19.

		 */

		lun_count++;

		if ((offset + 8) > cmd->data_length)

		if (offset >= cmd->data_length)

			continue;



		int_to_scsilun(deve->mapped_lun, (struct scsi_lun *)&buf[offset]);

		int_to_scsilun(deve->mapped_lun, &slun);

		memcpy(buf + offset, &slun,

		       min(8u, cmd->data_length - offset));

		offset += 8;

	}

	rcu_read_unlock();
@@ -1248,12 +1244,22 @@ sense_reason_t spc_emulate_report_luns(struct se_cmd *cmd) 
	 * See SPC3 r07, page 159.

	 */

done:

	lun_count *= 8;

	buf[0] = ((lun_count >> 24) & 0xff);

	buf[1] = ((lun_count >> 16) & 0xff);

	buf[2] = ((lun_count >> 8) & 0xff);

	buf[3] = (lun_count & 0xff);

	/*

	 * If no LUNs are accessible, report virtual LUN 0.

	 */

	if (lun_count == 0) {

		int_to_scsilun(0, &slun);

		if (cmd->data_length > 8)

			memcpy(buf + offset, &slun,

			       min(8u, cmd->data_length - offset));

		lun_count = 1;

	}



	if (buf) {

		len = cpu_to_be32(lun_count * 8);

		memcpy(buf, &len, min_t(int, sizeof len, cmd->data_length));

		transport_kunmap_data_sg(cmd);

	}



	target_complete_cmd_with_length(cmd, GOOD, 8 + lun_count * 8);

	return 0;