Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Five fixes, all in drivers.

  The most extensive is the target change to fix the hang in the login
  code, which involves changing timers from per login to per connection"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: stex: Fix gcc 13 warnings
  scsi: qla2xxx: Fix NULL pointer dereference in target mode
  scsi: target: iscsi: Prevent login threads from racing between each other
  scsi: target: iscsi: Remove unused transport_timer
  scsi: target: iscsi: Fix hang in the iSCSI login code

10 files changed, 116 insertions, 92 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index df5e5b7fdcfe..84aa3571be6d 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -3796,6 +3796,7 @@ struct qla_qpair {
 	uint64_t retry_term_jiff;
 	struct qla_tgt_counters tgt_counters;
 	uint16_t cpuid;
+	bool cpu_mapped;
 	struct qla_fw_resources fwres ____cacheline_aligned;
 	struct  qla_buf_pool buf_pool;
 	u32	cmd_cnt;
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index ec0423ec6681..1a955c3ff3d6 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -9426,6 +9426,9 @@ struct qla_qpair *qla2xxx_create_qpair(struct scsi_qla_host *vha, int qos,
 		qpair->rsp->req = qpair->req;
 		qpair->rsp->qpair = qpair;
 
+		if (!qpair->cpu_mapped)
+			qla_cpu_update(qpair, raw_smp_processor_id());
+
 		if (IS_T10_PI_CAPABLE(ha) && ql2xenabledif) {
 			if (ha->fw_attributes & BIT_4)
 				qpair->difdix_supported = 1;
diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h
index cce6e425c121..7b42558a8839 100644
--- a/drivers/scsi/qla2xxx/qla_inline.h
+++ b/drivers/scsi/qla2xxx/qla_inline.h
@@ -539,11 +539,14 @@ qla_mapq_init_qp_cpu_map(struct qla_hw_data *ha,
 	if (!ha->qp_cpu_map)
 		return;
 	mask = pci_irq_get_affinity(ha->pdev, msix->vector_base0);
+	if (!mask)
+		return;
 	qpair->cpuid = cpumask_first(mask);
 	for_each_cpu(cpu, mask) {
 		ha->qp_cpu_map[cpu] = qpair;
 	}
 	msix->cpuid = qpair->cpuid;
+	qpair->cpu_mapped = true;
 }
 
 static inline void
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 71feda2cdb63..245e3a5d81fd 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3770,6 +3770,9 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha,
 
 	if (rsp->qpair->cpuid != smp_processor_id() || !rsp->qpair->rcv_intr) {
 		rsp->qpair->rcv_intr = 1;
+
+		if (!rsp->qpair->cpu_mapped)
+			qla_cpu_update(rsp->qpair, raw_smp_processor_id());
 	}
 
 #define __update_rsp_in(_is_shadow_hba, _rsp, _rsp_in)			\
diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 5b230e149c3d..8ffb75be99bc 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -109,7 +109,9 @@ enum {
 	TASK_ATTRIBUTE_HEADOFQUEUE		= 0x1,
 	TASK_ATTRIBUTE_ORDERED			= 0x2,
 	TASK_ATTRIBUTE_ACA			= 0x4,
+};
 
+enum {
 	SS_STS_NORMAL				= 0x80000000,
 	SS_STS_DONE				= 0x40000000,
 	SS_STS_HANDSHAKE			= 0x20000000,
@@ -121,7 +123,9 @@ enum {
 	SS_I2H_REQUEST_RESET			= 0x2000,
 
 	SS_MU_OPERATIONAL			= 0x80000000,
+};
 
+enum {
 	STEX_CDB_LENGTH				= 16,
 	STATUS_VAR_LEN				= 128,
 
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index 834cce50f9b0..b516c2893420 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -364,8 +364,6 @@ struct iscsi_np *iscsit_add_np(
 	init_completion(&np->np_restart_comp);
 	INIT_LIST_HEAD(&np->np_list);
 
-	timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
-
 	ret = iscsi_target_setup_login_socket(np, sockaddr);
 	if (ret != 0) {
 		kfree(np);
diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c
index 274bdd7845ca..90b870f234f0 100644
--- a/drivers/target/iscsi/iscsi_target_login.c
+++ b/drivers/target/iscsi/iscsi_target_login.c
@@ -811,59 +811,6 @@ void iscsi_post_login_handler(
 	iscsit_dec_conn_usage_count(conn);
 }
 
-void iscsi_handle_login_thread_timeout(struct timer_list *t)
-{
-	struct iscsi_np *np = from_timer(np, t, np_login_timer);
-
-	spin_lock_bh(&np->np_thread_lock);
-	pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
-			&np->np_sockaddr);
-
-	if (np->np_login_timer_flags & ISCSI_TF_STOP) {
-		spin_unlock_bh(&np->np_thread_lock);
-		return;
-	}
-
-	if (np->np_thread)
-		send_sig(SIGINT, np->np_thread, 1);
-
-	np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
-	spin_unlock_bh(&np->np_thread_lock);
-}
-
-static void iscsi_start_login_thread_timer(struct iscsi_np *np)
-{
-	/*
-	 * This used the TA_LOGIN_TIMEOUT constant because at this
-	 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
-	 */
-	spin_lock_bh(&np->np_thread_lock);
-	np->np_login_timer_flags &= ~ISCSI_TF_STOP;
-	np->np_login_timer_flags |= ISCSI_TF_RUNNING;
-	mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
-
-	pr_debug("Added timeout timer to iSCSI login request for"
-			" %u seconds.\n", TA_LOGIN_TIMEOUT);
-	spin_unlock_bh(&np->np_thread_lock);
-}
-
-static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
-{
-	spin_lock_bh(&np->np_thread_lock);
-	if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
-		spin_unlock_bh(&np->np_thread_lock);
-		return;
-	}
-	np->np_login_timer_flags |= ISCSI_TF_STOP;
-	spin_unlock_bh(&np->np_thread_lock);
-
-	del_timer_sync(&np->np_login_timer);
-
-	spin_lock_bh(&np->np_thread_lock);
-	np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
-	spin_unlock_bh(&np->np_thread_lock);
-}
-
 int iscsit_setup_np(
 	struct iscsi_np *np,
 	struct sockaddr_storage *sockaddr)
@@ -1123,10 +1070,13 @@ static struct iscsit_conn *iscsit_alloc_conn(struct iscsi_np *np)
 	spin_lock_init(&conn->nopin_timer_lock);
 	spin_lock_init(&conn->response_queue_lock);
 	spin_lock_init(&conn->state_lock);
+	spin_lock_init(&conn->login_worker_lock);
+	spin_lock_init(&conn->login_timer_lock);
 
 	timer_setup(&conn->nopin_response_timer,
 		    iscsit_handle_nopin_response_timeout, 0);
 	timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
+	timer_setup(&conn->login_timer, iscsit_login_timeout, 0);
 
 	if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
 		goto free_conn;
@@ -1304,7 +1254,7 @@ static int __iscsi_target_login_thread(struct iscsi_np *np)
 		goto new_sess_out;
 	}
 
-	iscsi_start_login_thread_timer(np);
+	iscsit_start_login_timer(conn, current);
 
 	pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
 	conn->conn_state = TARG_CONN_STATE_XPT_UP;
@@ -1417,8 +1367,6 @@ static int __iscsi_target_login_thread(struct iscsi_np *np)
 	if (ret < 0)
 		goto new_sess_out;
 
-	iscsi_stop_login_thread_timer(np);
-
 	if (ret == 1) {
 		tpg_np = conn->tpg_np;
 
@@ -1434,7 +1382,7 @@ static int __iscsi_target_login_thread(struct iscsi_np *np)
 new_sess_out:
 	new_sess = true;
 old_sess_out:
-	iscsi_stop_login_thread_timer(np);
+	iscsit_stop_login_timer(conn);
 	tpg_np = conn->tpg_np;
 	iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
 	new_sess = false;
@@ -1448,7 +1396,6 @@ old_sess_out:
 	return 1;
 
 exit:
-	iscsi_stop_login_thread_timer(np);
 	spin_lock_bh(&np->np_thread_lock);
 	np->np_thread_state = ISCSI_NP_THREAD_EXIT;
 	spin_unlock_bh(&np->np_thread_lock);
diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c
index 24040c118e49..fa3fb5f4e6bc 100644
--- a/drivers/target/iscsi/iscsi_target_nego.c
+++ b/drivers/target/iscsi/iscsi_target_nego.c
@@ -535,25 +535,6 @@ static void iscsi_target_login_drop(struct iscsit_conn *conn, struct iscsi_login
 	iscsi_target_login_sess_out(conn, zero_tsih, true);
 }
 
-struct conn_timeout {
-	struct timer_list timer;
-	struct iscsit_conn *conn;
-};
-
-static void iscsi_target_login_timeout(struct timer_list *t)
-{
-	struct conn_timeout *timeout = from_timer(timeout, t, timer);
-	struct iscsit_conn *conn = timeout->conn;
-
-	pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
-
-	if (conn->login_kworker) {
-		pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
-			 conn->login_kworker->comm, conn->login_kworker->pid);
-		send_sig(SIGINT, conn->login_kworker, 1);
-	}
-}
-
 static void iscsi_target_do_login_rx(struct work_struct *work)
 {
 	struct iscsit_conn *conn = container_of(work,
@@ -562,12 +543,15 @@ static void iscsi_target_do_login_rx(struct work_struct *work)
 	struct iscsi_np *np = login->np;
 	struct iscsi_portal_group *tpg = conn->tpg;
 	struct iscsi_tpg_np *tpg_np = conn->tpg_np;
-	struct conn_timeout timeout;
 	int rc, zero_tsih = login->zero_tsih;
 	bool state;
 
 	pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 			conn, current->comm, current->pid);
+
+	spin_lock(&conn->login_worker_lock);
+	set_bit(LOGIN_FLAGS_WORKER_RUNNING, &conn->login_flags);
+	spin_unlock(&conn->login_worker_lock);
 	/*
 	 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
 	 * before initial PDU processing in iscsi_target_start_negotiation()
@@ -597,19 +581,16 @@ static void iscsi_target_do_login_rx(struct work_struct *work)
 		goto err;
 	}
 
-	conn->login_kworker = current;
 	allow_signal(SIGINT);
-
-	timeout.conn = conn;
-	timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
-	mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
-	pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
+	rc = iscsit_set_login_timer_kworker(conn, current);
+	if (rc < 0) {
+		/* The login timer has already expired */
+		pr_debug("iscsi_target_do_login_rx, login failed\n");
+		goto err;
+	}
 
 	rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
-	del_timer_sync(&timeout.timer);
-	destroy_timer_on_stack(&timeout.timer);
 	flush_signals(current);
-	conn->login_kworker = NULL;
 
 	if (rc < 0)
 		goto err;
@@ -646,7 +627,17 @@ static void iscsi_target_do_login_rx(struct work_struct *work)
 		if (iscsi_target_sk_check_and_clear(conn,
 						    LOGIN_FLAGS_WRITE_ACTIVE))
 			goto err;
+
+		/*
+		 * Set the login timer thread pointer to NULL to prevent the
+		 * login process from getting stuck if the initiator
+		 * stops sending data.
+		 */
+		rc = iscsit_set_login_timer_kworker(conn, NULL);
+		if (rc < 0)
+			goto err;
 	} else if (rc == 1) {
+		iscsit_stop_login_timer(conn);
 		cancel_delayed_work(&conn->login_work);
 		iscsi_target_nego_release(conn);
 		iscsi_post_login_handler(np, conn, zero_tsih);
@@ -656,6 +647,7 @@ static void iscsi_target_do_login_rx(struct work_struct *work)
 
 err:
 	iscsi_target_restore_sock_callbacks(conn);
+	iscsit_stop_login_timer(conn);
 	cancel_delayed_work(&conn->login_work);
 	iscsi_target_login_drop(conn, login);
 	iscsit_deaccess_np(np, tpg, tpg_np);
@@ -1130,6 +1122,7 @@ int iscsi_target_locate_portal(
 	iscsi_target_set_sock_callbacks(conn);
 
 	login->np = np;
+	conn->tpg = NULL;
 
 	login_req = (struct iscsi_login_req *) login->req;
 	payload_length = ntoh24(login_req->dlength);
@@ -1197,7 +1190,6 @@ int iscsi_target_locate_portal(
 	 */
 	sessiontype = strncmp(s_buf, DISCOVERY, 9);
 	if (!sessiontype) {
-		conn->tpg = iscsit_global->discovery_tpg;
 		if (!login->leading_connection)
 			goto get_target;
 
@@ -1214,9 +1206,11 @@ int iscsi_target_locate_portal(
 		 * Serialize access across the discovery struct iscsi_portal_group to
 		 * process login attempt.
 		 */
+		conn->tpg = iscsit_global->discovery_tpg;
 		if (iscsit_access_np(np, conn->tpg) < 0) {
 			iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 				ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
+			conn->tpg = NULL;
 			ret = -1;
 			goto out;
 		}
@@ -1368,14 +1362,30 @@ int iscsi_target_start_negotiation(
 	 * and perform connection cleanup now.
 	 */
 	ret = iscsi_target_do_login(conn, login);
-	if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
-		ret = -1;
+	if (!ret) {
+		spin_lock(&conn->login_worker_lock);
+
+		if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
+			ret = -1;
+		else if (!test_bit(LOGIN_FLAGS_WORKER_RUNNING, &conn->login_flags)) {
+			if (iscsit_set_login_timer_kworker(conn, NULL) < 0) {
+				/*
+				 * The timeout has expired already.
+				 * Schedule login_work to perform the cleanup.
+				 */
+				schedule_delayed_work(&conn->login_work, 0);
+			}
+		}
+
+		spin_unlock(&conn->login_worker_lock);
+	}
 
 	if (ret < 0) {
 		iscsi_target_restore_sock_callbacks(conn);
 		iscsi_remove_failed_auth_entry(conn);
 	}
 	if (ret != 0) {
+		iscsit_stop_login_timer(conn);
 		cancel_delayed_work_sync(&conn->login_work);
 		iscsi_target_nego_release(conn);
 	}
diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c
index 26dc8ed3045b..b14835fcb033 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -1040,6 +1040,57 @@ void iscsit_stop_nopin_timer(struct iscsit_conn *conn)
 	spin_unlock_bh(&conn->nopin_timer_lock);
 }
 
+void iscsit_login_timeout(struct timer_list *t)
+{
+	struct iscsit_conn *conn = from_timer(conn, t, login_timer);
+	struct iscsi_login *login = conn->login;
+
+	pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
+
+	spin_lock_bh(&conn->login_timer_lock);
+	login->login_failed = 1;
+
+	if (conn->login_kworker) {
+		pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
+			 conn->login_kworker->comm, conn->login_kworker->pid);
+		send_sig(SIGINT, conn->login_kworker, 1);
+	} else {
+		schedule_delayed_work(&conn->login_work, 0);
+	}
+	spin_unlock_bh(&conn->login_timer_lock);
+}
+
+void iscsit_start_login_timer(struct iscsit_conn *conn, struct task_struct *kthr)
+{
+	pr_debug("Login timer started\n");
+
+	conn->login_kworker = kthr;
+	mod_timer(&conn->login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
+}
+
+int iscsit_set_login_timer_kworker(struct iscsit_conn *conn, struct task_struct *kthr)
+{
+	struct iscsi_login *login = conn->login;
+	int ret = 0;
+
+	spin_lock_bh(&conn->login_timer_lock);
+	if (login->login_failed) {
+		/* The timer has already expired */
+		ret = -1;
+	} else {
+		conn->login_kworker = kthr;
+	}
+	spin_unlock_bh(&conn->login_timer_lock);
+
+	return ret;
+}
+
+void iscsit_stop_login_timer(struct iscsit_conn *conn)
+{
+	pr_debug("Login timer stopped\n");
+	timer_delete_sync(&conn->login_timer);
+}
+
 int iscsit_send_tx_data(
 	struct iscsit_cmd *cmd,
 	struct iscsit_conn *conn,
diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h
index 33ea799a0850..24b8e577575a 100644
--- a/drivers/target/iscsi/iscsi_target_util.h
+++ b/drivers/target/iscsi/iscsi_target_util.h
@@ -56,6 +56,10 @@ extern void iscsit_handle_nopin_timeout(struct timer_list *t);
 extern void __iscsit_start_nopin_timer(struct iscsit_conn *);
 extern void iscsit_start_nopin_timer(struct iscsit_conn *);
 extern void iscsit_stop_nopin_timer(struct iscsit_conn *);
+extern void iscsit_login_timeout(struct timer_list *t);
+extern void iscsit_start_login_timer(struct iscsit_conn *, struct task_struct *kthr);
+extern void iscsit_stop_login_timer(struct iscsit_conn *);
+extern int iscsit_set_login_timer_kworker(struct iscsit_conn *, struct task_struct *kthr);
 extern int iscsit_send_tx_data(struct iscsit_cmd *, struct iscsit_conn *, int);
 extern int iscsit_fe_sendpage_sg(struct iscsit_cmd *, struct iscsit_conn *);
 extern int iscsit_tx_login_rsp(struct iscsit_conn *, u8, u8);