1 files changed, 281 insertions, 158 deletions

diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 641201e62c1b..257b497d515a 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -207,7 +207,6 @@ static LIST_HEAD(fcloop_nports);
 struct fcloop_lport {
 	struct nvme_fc_local_port *localport;
 	struct list_head lport_list;
-	struct completion unreg_done;
 	refcount_t ref;
 };
 
@@ -215,6 +214,9 @@ struct fcloop_lport_priv {
 	struct fcloop_lport *lport;
 };
 
+/* The port is already being removed, avoid double free */
+#define PORT_DELETED	0
+
 struct fcloop_rport {
 	struct nvme_fc_remote_port	*remoteport;
 	struct nvmet_fc_target_port	*targetport;
@@ -223,6 +225,7 @@ struct fcloop_rport {
 	spinlock_t			lock;
 	struct list_head		ls_list;
 	struct work_struct		ls_work;
+	unsigned long			flags;
 };
 
 struct fcloop_tport {
@@ -233,6 +236,7 @@ struct fcloop_tport {
 	spinlock_t			lock;
 	struct list_head		ls_list;
 	struct work_struct		ls_work;
+	unsigned long			flags;
 };
 
 struct fcloop_nport {
@@ -288,6 +292,9 @@ struct fcloop_ini_fcpreq {
 	spinlock_t			inilock;
 };
 
+/* SLAB cache for fcloop_lsreq structures */
+static struct kmem_cache *lsreq_cache;
+
 static inline struct fcloop_lsreq *
 ls_rsp_to_lsreq(struct nvmefc_ls_rsp *lsrsp)
 {
@@ -338,6 +345,7 @@ fcloop_rport_lsrqst_work(struct work_struct *work)
 		 * callee may free memory containing tls_req.
 		 * do not reference lsreq after this.
 		 */
+		kmem_cache_free(lsreq_cache, tls_req);
 
 		spin_lock(&rport->lock);
 	}
@@ -349,10 +357,13 @@ fcloop_h2t_ls_req(struct nvme_fc_local_port *localport,
 			struct nvme_fc_remote_port *remoteport,
 			struct nvmefc_ls_req *lsreq)
 {
-	struct fcloop_lsreq *tls_req = lsreq->private;
 	struct fcloop_rport *rport = remoteport->private;
+	struct fcloop_lsreq *tls_req;
 	int ret = 0;
 
+	tls_req = kmem_cache_alloc(lsreq_cache, GFP_KERNEL);
+	if (!tls_req)
+		return -ENOMEM;
 	tls_req->lsreq = lsreq;
 	INIT_LIST_HEAD(&tls_req->ls_list);
 
@@ -389,14 +400,17 @@ fcloop_h2t_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
 
 	lsrsp->done(lsrsp);
 
-	if (remoteport) {
-		rport = remoteport->private;
-		spin_lock(&rport->lock);
-		list_add_tail(&tls_req->ls_list, &rport->ls_list);
-		spin_unlock(&rport->lock);
-		queue_work(nvmet_wq, &rport->ls_work);
+	if (!remoteport) {
+		kmem_cache_free(lsreq_cache, tls_req);
+		return 0;
 	}
 
+	rport = remoteport->private;
+	spin_lock(&rport->lock);
+	list_add_tail(&tls_req->ls_list, &rport->ls_list);
+	spin_unlock(&rport->lock);
+	queue_work(nvmet_wq, &rport->ls_work);
+
 	return 0;
 }
 
@@ -422,6 +436,7 @@ fcloop_tport_lsrqst_work(struct work_struct *work)
 		 * callee may free memory containing tls_req.
 		 * do not reference lsreq after this.
 		 */
+		kmem_cache_free(lsreq_cache, tls_req);
 
 		spin_lock(&tport->lock);
 	}
@@ -432,8 +447,8 @@ static int
 fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
 			struct nvmefc_ls_req *lsreq)
 {
-	struct fcloop_lsreq *tls_req = lsreq->private;
 	struct fcloop_tport *tport = targetport->private;
+	struct fcloop_lsreq *tls_req;
 	int ret = 0;
 
 	/*
@@ -441,6 +456,10 @@ fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
 	 * hosthandle ignored as fcloop currently is
 	 * 1:1 tgtport vs remoteport
 	 */
+
+	tls_req = kmem_cache_alloc(lsreq_cache, GFP_KERNEL);
+	if (!tls_req)
+		return -ENOMEM;
 	tls_req->lsreq = lsreq;
 	INIT_LIST_HEAD(&tls_req->ls_list);
 
@@ -457,6 +476,9 @@ fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
 	ret = nvme_fc_rcv_ls_req(tport->remoteport, &tls_req->ls_rsp,
 				 lsreq->rqstaddr, lsreq->rqstlen);
 
+	if (ret)
+		kmem_cache_free(lsreq_cache, tls_req);
+
 	return ret;
 }
 
@@ -471,18 +493,30 @@ fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
 	struct nvmet_fc_target_port *targetport = rport->targetport;
 	struct fcloop_tport *tport;
 
+	if (!targetport) {
+		/*
+		 * The target port is gone. The target doesn't expect any
+		 * response anymore and the ->done call is not valid
+		 * because the resources have been freed by
+		 * nvmet_fc_free_pending_reqs.
+		 *
+		 * We end up here from delete association exchange:
+		 * nvmet_fc_xmt_disconnect_assoc sends an async request.
+		 */
+		kmem_cache_free(lsreq_cache, tls_req);
+		return 0;
+	}
+
 	memcpy(lsreq->rspaddr, lsrsp->rspbuf,
 		((lsreq->rsplen < lsrsp->rsplen) ?
 				lsreq->rsplen : lsrsp->rsplen));
 	lsrsp->done(lsrsp);
 
-	if (targetport) {
-		tport = targetport->private;
-		spin_lock(&tport->lock);
-		list_add_tail(&tls_req->ls_list, &tport->ls_list);
-		spin_unlock(&tport->lock);
-		queue_work(nvmet_wq, &tport->ls_work);
-	}
+	tport = targetport->private;
+	spin_lock(&tport->lock);
+	list_add_tail(&tls_req->ls_list, &tport->ls_list);
+	spin_unlock(&tport->lock);
+	queue_work(nvmet_wq, &tport->ls_work);
 
 	return 0;
 }
@@ -566,7 +600,8 @@ fcloop_call_host_done(struct nvmefc_fcp_req *fcpreq,
 	}
 
 	/* release original io reference on tgt struct */
-	fcloop_tfcp_req_put(tfcp_req);
+	if (tfcp_req)
+		fcloop_tfcp_req_put(tfcp_req);
 }
 
 static bool drop_fabric_opcode;
@@ -618,12 +653,13 @@ fcloop_fcp_recv_work(struct work_struct *work)
 {
 	struct fcloop_fcpreq *tfcp_req =
 		container_of(work, struct fcloop_fcpreq, fcp_rcv_work);
-	struct nvmefc_fcp_req *fcpreq = tfcp_req->fcpreq;
+	struct nvmefc_fcp_req *fcpreq;
 	unsigned long flags;
 	int ret = 0;
 	bool aborted = false;
 
 	spin_lock_irqsave(&tfcp_req->reqlock, flags);
+	fcpreq = tfcp_req->fcpreq;
 	switch (tfcp_req->inistate) {
 	case INI_IO_START:
 		tfcp_req->inistate = INI_IO_ACTIVE;
@@ -638,16 +674,19 @@ fcloop_fcp_recv_work(struct work_struct *work)
 	}
 	spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
 
-	if (unlikely(aborted))
-		ret = -ECANCELED;
-	else {
-		if (likely(!check_for_drop(tfcp_req)))
-			ret = nvmet_fc_rcv_fcp_req(tfcp_req->tport->targetport,
-				&tfcp_req->tgt_fcp_req,
-				fcpreq->cmdaddr, fcpreq->cmdlen);
-		else
-			pr_info("%s: dropped command ********\n", __func__);
+	if (unlikely(aborted)) {
+		/* the abort handler will call fcloop_call_host_done */
+		return;
+	}
+
+	if (unlikely(check_for_drop(tfcp_req))) {
+		pr_info("%s: dropped command ********\n", __func__);
+		return;
 	}
+
+	ret = nvmet_fc_rcv_fcp_req(tfcp_req->tport->targetport,
+				   &tfcp_req->tgt_fcp_req,
+				   fcpreq->cmdaddr, fcpreq->cmdlen);
 	if (ret)
 		fcloop_call_host_done(fcpreq, tfcp_req, ret);
 }
@@ -662,15 +701,17 @@ fcloop_fcp_abort_recv_work(struct work_struct *work)
 	unsigned long flags;
 
 	spin_lock_irqsave(&tfcp_req->reqlock, flags);
-	fcpreq = tfcp_req->fcpreq;
 	switch (tfcp_req->inistate) {
 	case INI_IO_ABORTED:
+		fcpreq = tfcp_req->fcpreq;
+		tfcp_req->fcpreq = NULL;
 		break;
 	case INI_IO_COMPLETED:
 		completed = true;
 		break;
 	default:
 		spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
+		fcloop_tfcp_req_put(tfcp_req);
 		WARN_ON(1);
 		return;
 	}
@@ -686,10 +727,6 @@ fcloop_fcp_abort_recv_work(struct work_struct *work)
 		nvmet_fc_rcv_fcp_abort(tfcp_req->tport->targetport,
 					&tfcp_req->tgt_fcp_req);
 
-	spin_lock_irqsave(&tfcp_req->reqlock, flags);
-	tfcp_req->fcpreq = NULL;
-	spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
-
 	fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED);
 	/* call_host_done releases reference for abort downcall */
 }
@@ -958,13 +995,16 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
 
 	spin_lock(&inireq->inilock);
 	tfcp_req = inireq->tfcp_req;
-	if (tfcp_req)
-		fcloop_tfcp_req_get(tfcp_req);
+	if (tfcp_req) {
+		if (!fcloop_tfcp_req_get(tfcp_req))
+			tfcp_req = NULL;
+	}
 	spin_unlock(&inireq->inilock);
 
-	if (!tfcp_req)
+	if (!tfcp_req) {
 		/* abort has already been called */
-		return;
+		goto out_host_done;
+	}
 
 	/* break initiator/target relationship for io */
 	spin_lock_irqsave(&tfcp_req->reqlock, flags);
@@ -979,7 +1019,7 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
 	default:
 		spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
 		WARN_ON(1);
-		return;
+		goto out_host_done;
 	}
 	spin_unlock_irqrestore(&tfcp_req->reqlock, flags);
 
@@ -993,6 +1033,11 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
 		 */
 		fcloop_tfcp_req_put(tfcp_req);
 	}
+
+	return;
+
+out_host_done:
+	fcloop_call_host_done(fcpreq, tfcp_req, -ECANCELED);
 }
 
 static void
@@ -1019,9 +1064,18 @@ fcloop_lport_get(struct fcloop_lport *lport)
 static void
 fcloop_nport_put(struct fcloop_nport *nport)
 {
+	unsigned long flags;
+
 	if (!refcount_dec_and_test(&nport->ref))
 		return;
 
+	spin_lock_irqsave(&fcloop_lock, flags);
+	list_del(&nport->nport_list);
+	spin_unlock_irqrestore(&fcloop_lock, flags);
+
+	if (nport->lport)
+		fcloop_lport_put(nport->lport);
+
 	kfree(nport);
 }
 
@@ -1037,9 +1091,6 @@ fcloop_localport_delete(struct nvme_fc_local_port *localport)
 	struct fcloop_lport_priv *lport_priv = localport->private;
 	struct fcloop_lport *lport = lport_priv->lport;
 
-	/* release any threads waiting for the unreg to complete */
-	complete(&lport->unreg_done);
-
 	fcloop_lport_put(lport);
 }
 
@@ -1047,18 +1098,38 @@ static void
 fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport)
 {
 	struct fcloop_rport *rport = remoteport->private;
+	bool put_port = false;
+	unsigned long flags;
 
 	flush_work(&rport->ls_work);
-	fcloop_nport_put(rport->nport);
+
+	spin_lock_irqsave(&fcloop_lock, flags);
+	if (!test_and_set_bit(PORT_DELETED, &rport->flags))
+		put_port = true;
+	rport->nport->rport = NULL;
+	spin_unlock_irqrestore(&fcloop_lock, flags);
+
+	if (put_port)
+		fcloop_nport_put(rport->nport);
 }
 
 static void
 fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
 {
 	struct fcloop_tport *tport = targetport->private;
+	bool put_port = false;
+	unsigned long flags;
 
 	flush_work(&tport->ls_work);
-	fcloop_nport_put(tport->nport);
+
+	spin_lock_irqsave(&fcloop_lock, flags);
+	if (!test_and_set_bit(PORT_DELETED, &tport->flags))
+		put_port = true;
+	tport->nport->tport = NULL;
+	spin_unlock_irqrestore(&fcloop_lock, flags);
+
+	if (put_port)
+		fcloop_nport_put(tport->nport);
 }
 
 #define	FCLOOP_HW_QUEUES		4
@@ -1082,7 +1153,6 @@ static struct nvme_fc_port_template fctemplate = {
 	/* sizes of additional private data for data structures */
 	.local_priv_sz		= sizeof(struct fcloop_lport_priv),
 	.remote_priv_sz		= sizeof(struct fcloop_rport),
-	.lsrqst_priv_sz		= sizeof(struct fcloop_lsreq),
 	.fcprqst_priv_sz	= sizeof(struct fcloop_ini_fcpreq),
 };
 
@@ -1105,7 +1175,6 @@ static struct nvmet_fc_target_template tgttemplate = {
 	.target_features	= 0,
 	/* sizes of additional private data for data structures */
 	.target_priv_sz		= sizeof(struct fcloop_tport),
-	.lsrqst_priv_sz		= sizeof(struct fcloop_lsreq),
 };
 
 static ssize_t
@@ -1170,51 +1239,92 @@ out_free_lport:
 }
 
 static int
-__wait_localport_unreg(struct fcloop_lport *lport)
+__localport_unreg(struct fcloop_lport *lport)
 {
-	int ret;
+	return nvme_fc_unregister_localport(lport->localport);
+}
 
-	init_completion(&lport->unreg_done);
+static struct fcloop_nport *
+__fcloop_nport_lookup(u64 node_name, u64 port_name)
+{
+	struct fcloop_nport *nport;
 
-	ret = nvme_fc_unregister_localport(lport->localport);
+	list_for_each_entry(nport, &fcloop_nports, nport_list) {
+		if (nport->node_name != node_name ||
+		    nport->port_name != port_name)
+			continue;
 
-	if (!ret)
-		wait_for_completion(&lport->unreg_done);
+		if (fcloop_nport_get(nport))
+			return nport;
 
-	return ret;
+		break;
+	}
+
+	return NULL;
 }
 
+static struct fcloop_nport *
+fcloop_nport_lookup(u64 node_name, u64 port_name)
+{
+	struct fcloop_nport *nport;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fcloop_lock, flags);
+	nport = __fcloop_nport_lookup(node_name, port_name);
+	spin_unlock_irqrestore(&fcloop_lock, flags);
+
+	return nport;
+}
+
+static struct fcloop_lport *
+__fcloop_lport_lookup(u64 node_name, u64 port_name)
+{
+	struct fcloop_lport *lport;
+
+	list_for_each_entry(lport, &fcloop_lports, lport_list) {
+		if (lport->localport->node_name != node_name ||
+		    lport->localport->port_name != port_name)
+			continue;
+
+		if (fcloop_lport_get(lport))
+			return lport;
+
+		break;
+	}
+
+	return NULL;
+}
+
+static struct fcloop_lport *
+fcloop_lport_lookup(u64 node_name, u64 port_name)
+{
+	struct fcloop_lport *lport;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fcloop_lock, flags);
+	lport = __fcloop_lport_lookup(node_name, port_name);
+	spin_unlock_irqrestore(&fcloop_lock, flags);
+
+	return lport;
+}
 
 static ssize_t
 fcloop_delete_local_port(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {
-	struct fcloop_lport *tlport, *lport = NULL;
+	struct fcloop_lport *lport;
 	u64 nodename, portname;
-	unsigned long flags;
 	int ret;
 
 	ret = fcloop_parse_nm_options(dev, &nodename, &portname, buf);
 	if (ret)
 		return ret;
 
-	spin_lock_irqsave(&fcloop_lock, flags);
-
-	list_for_each_entry(tlport, &fcloop_lports, lport_list) {
-		if (tlport->localport->node_name == nodename &&
-		    tlport->localport->port_name == portname) {
-			if (!fcloop_lport_get(tlport))
-				break;
-			lport = tlport;
-			break;
-		}
-	}
-	spin_unlock_irqrestore(&fcloop_lock, flags);
-
+	lport = fcloop_lport_lookup(nodename, portname);
 	if (!lport)
 		return -ENOENT;
 
-	ret = __wait_localport_unreg(lport);
+	ret = __localport_unreg(lport);
 	fcloop_lport_put(lport);
 
 	return ret ? ret : count;
@@ -1223,8 +1333,8 @@ fcloop_delete_local_port(struct device *dev, struct device_attribute *attr,
 static struct fcloop_nport *
 fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
 {
-	struct fcloop_nport *newnport, *nport = NULL;
-	struct fcloop_lport *tmplport, *lport = NULL;
+	struct fcloop_nport *newnport, *nport;
+	struct fcloop_lport *lport;
 	struct fcloop_ctrl_options *opts;
 	unsigned long flags;
 	u32 opts_mask = (remoteport) ? RPORT_OPTS : TGTPORT_OPTS;
@@ -1239,10 +1349,8 @@ fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
 		goto out_free_opts;
 
 	/* everything there ? */
-	if ((opts->mask & opts_mask) != opts_mask) {
-		ret = -EINVAL;
+	if ((opts->mask & opts_mask) != opts_mask)
 		goto out_free_opts;
-	}
 
 	newnport = kzalloc(sizeof(*newnport), GFP_KERNEL);
 	if (!newnport)
@@ -1258,60 +1366,61 @@ fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
 	refcount_set(&newnport->ref, 1);
 
 	spin_lock_irqsave(&fcloop_lock, flags);
-
-	list_for_each_entry(tmplport, &fcloop_lports, lport_list) {
-		if (tmplport->localport->node_name == opts->wwnn &&
-		    tmplport->localport->port_name == opts->wwpn)
-			goto out_invalid_opts;
-
-		if (tmplport->localport->node_name == opts->lpwwnn &&
-		    tmplport->localport->port_name == opts->lpwwpn)
-			lport = tmplport;
+	lport = __fcloop_lport_lookup(opts->wwnn, opts->wwpn);
+	if (lport) {
+		/* invalid configuration */
+		fcloop_lport_put(lport);
+		goto out_free_newnport;
 	}
 
 	if (remoteport) {
-		if (!lport)
-			goto out_invalid_opts;
-		newnport->lport = lport;
-	}
-
-	list_for_each_entry(nport, &fcloop_nports, nport_list) {
-		if (nport->node_name == opts->wwnn &&
-		    nport->port_name == opts->wwpn) {
-			if ((remoteport && nport->rport) ||
-			    (!remoteport && nport->tport)) {
-				nport = NULL;
-				goto out_invalid_opts;
-			}
-
-			fcloop_nport_get(nport);
-
-			spin_unlock_irqrestore(&fcloop_lock, flags);
-
-			if (remoteport)
-				nport->lport = lport;
-			if (opts->mask & NVMF_OPT_ROLES)
-				nport->port_role = opts->roles;
-			if (opts->mask & NVMF_OPT_FCADDR)
-				nport->port_id = opts->fcaddr;
+		lport = __fcloop_lport_lookup(opts->lpwwnn, opts->lpwwpn);
+		if (!lport) {
+			/* invalid configuration */
 			goto out_free_newnport;
 		}
 	}
 
-	list_add_tail(&newnport->nport_list, &fcloop_nports);
+	nport = __fcloop_nport_lookup(opts->wwnn, opts->wwpn);
+	if (nport) {
+		if ((remoteport && nport->rport) ||
+		    (!remoteport && nport->tport)) {
+			/* invalid configuration */
+			goto out_put_nport;
+		}
+
+		/* found existing nport, discard the new nport */
+		kfree(newnport);
+	} else {
+		list_add_tail(&newnport->nport_list, &fcloop_nports);
+		nport = newnport;
+	}
 
+	if (opts->mask & NVMF_OPT_ROLES)
+		nport->port_role = opts->roles;
+	if (opts->mask & NVMF_OPT_FCADDR)
+		nport->port_id = opts->fcaddr;
+	if (lport) {
+		if (!nport->lport)
+			nport->lport = lport;
+		else
+			fcloop_lport_put(lport);
+	}
 	spin_unlock_irqrestore(&fcloop_lock, flags);
 
 	kfree(opts);
-	return newnport;
+	return nport;
 
-out_invalid_opts:
-	spin_unlock_irqrestore(&fcloop_lock, flags);
+out_put_nport:
+	if (lport)
+		fcloop_lport_put(lport);
+	fcloop_nport_put(nport);
 out_free_newnport:
+	spin_unlock_irqrestore(&fcloop_lock, flags);
 	kfree(newnport);
 out_free_opts:
 	kfree(opts);
-	return nport;
+	return NULL;
 }
 
 static ssize_t
@@ -1352,6 +1461,7 @@ fcloop_create_remote_port(struct device *dev, struct device_attribute *attr,
 	rport->nport = nport;
 	rport->lport = nport->lport;
 	nport->rport = rport;
+	rport->flags = 0;
 	spin_lock_init(&rport->lock);
 	INIT_WORK(&rport->ls_work, fcloop_rport_lsrqst_work);
 	INIT_LIST_HEAD(&rport->ls_list);
@@ -1365,21 +1475,18 @@ __unlink_remote_port(struct fcloop_nport *nport)
 {
 	struct fcloop_rport *rport = nport->rport;
 
+	lockdep_assert_held(&fcloop_lock);
+
 	if (rport && nport->tport)
 		nport->tport->remoteport = NULL;
 	nport->rport = NULL;
 
-	list_del(&nport->nport_list);
-
 	return rport;
 }
 
 static int
 __remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
 {
-	if (!rport)
-		return -EALREADY;
-
 	return nvme_fc_unregister_remoteport(rport->remoteport);
 }
 
@@ -1387,8 +1494,8 @@ static ssize_t
 fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {
-	struct fcloop_nport *nport = NULL, *tmpport;
-	static struct fcloop_rport *rport;
+	struct fcloop_nport *nport;
+	struct fcloop_rport *rport;
 	u64 nodename, portname;
 	unsigned long flags;
 	int ret;
@@ -1397,24 +1504,24 @@ fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr,
 	if (ret)
 		return ret;
 
-	spin_lock_irqsave(&fcloop_lock, flags);
-
-	list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
-		if (tmpport->node_name == nodename &&
-		    tmpport->port_name == portname && tmpport->rport) {
-			nport = tmpport;
-			rport = __unlink_remote_port(nport);
-			break;
-		}
-	}
+	nport = fcloop_nport_lookup(nodename, portname);
+	if (!nport)
+		return -ENOENT;
 
+	spin_lock_irqsave(&fcloop_lock, flags);
+	rport = __unlink_remote_port(nport);
 	spin_unlock_irqrestore(&fcloop_lock, flags);
 
-	if (!nport)
-		return -ENOENT;
+	if (!rport) {
+		ret = -ENOENT;
+		goto out_nport_put;
+	}
 
 	ret = __remoteport_unreg(nport, rport);
 
+out_nport_put:
+	fcloop_nport_put(nport);
+
 	return ret ? ret : count;
 }
 
@@ -1452,6 +1559,7 @@ fcloop_create_target_port(struct device *dev, struct device_attribute *attr,
 	tport->nport = nport;
 	tport->lport = nport->lport;
 	nport->tport = tport;
+	tport->flags = 0;
 	spin_lock_init(&tport->lock);
 	INIT_WORK(&tport->ls_work, fcloop_tport_lsrqst_work);
 	INIT_LIST_HEAD(&tport->ls_list);
@@ -1465,6 +1573,8 @@ __unlink_target_port(struct fcloop_nport *nport)
 {
 	struct fcloop_tport *tport = nport->tport;
 
+	lockdep_assert_held(&fcloop_lock);
+
 	if (tport && nport->rport)
 		nport->rport->targetport = NULL;
 	nport->tport = NULL;
@@ -1475,9 +1585,6 @@ __unlink_target_port(struct fcloop_nport *nport)
 static int
 __targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
 {
-	if (!tport)
-		return -EALREADY;
-
 	return nvmet_fc_unregister_targetport(tport->targetport);
 }
 
@@ -1485,8 +1592,8 @@ static ssize_t
 fcloop_delete_target_port(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {
-	struct fcloop_nport *nport = NULL, *tmpport;
-	struct fcloop_tport *tport = NULL;
+	struct fcloop_nport *nport;
+	struct fcloop_tport *tport;
 	u64 nodename, portname;
 	unsigned long flags;
 	int ret;
@@ -1495,24 +1602,24 @@ fcloop_delete_target_port(struct device *dev, struct device_attribute *attr,
 	if (ret)
 		return ret;
 
-	spin_lock_irqsave(&fcloop_lock, flags);
-
-	list_for_each_entry(tmpport, &fcloop_nports, nport_list) {
-		if (tmpport->node_name == nodename &&
-		    tmpport->port_name == portname && tmpport->tport) {
-			nport = tmpport;
-			tport = __unlink_target_port(nport);
-			break;
-		}
-	}
+	nport = fcloop_nport_lookup(nodename, portname);
+	if (!nport)
+		return -ENOENT;
 
+	spin_lock_irqsave(&fcloop_lock, flags);
+	tport = __unlink_target_port(nport);
 	spin_unlock_irqrestore(&fcloop_lock, flags);
 
-	if (!nport)
-		return -ENOENT;
+	if (!tport) {
+		ret = -ENOENT;
+		goto out_nport_put;
+	}
 
 	ret = __targetport_unreg(nport, tport);
 
+out_nport_put:
+	fcloop_nport_put(nport);
+
 	return ret ? ret : count;
 }
 
@@ -1578,15 +1685,20 @@ static const struct class fcloop_class = {
 };
 static struct device *fcloop_device;
 
-
 static int __init fcloop_init(void)
 {
 	int ret;
 
+	lsreq_cache = kmem_cache_create("lsreq_cache",
+				sizeof(struct fcloop_lsreq), 0,
+				0, NULL);
+	if (!lsreq_cache)
+		return -ENOMEM;
+
 	ret = class_register(&fcloop_class);
 	if (ret) {
 		pr_err("couldn't register class fcloop\n");
-		return ret;
+		goto out_destroy_cache;
 	}
 
 	fcloop_device = device_create_with_groups(
@@ -1604,13 +1716,15 @@ static int __init fcloop_init(void)
 
 out_destroy_class:
 	class_unregister(&fcloop_class);
+out_destroy_cache:
+	kmem_cache_destroy(lsreq_cache);
 	return ret;
 }
 
 static void __exit fcloop_exit(void)
 {
-	struct fcloop_lport *lport = NULL;
-	struct fcloop_nport *nport = NULL;
+	struct fcloop_lport *lport;
+	struct fcloop_nport *nport;
 	struct fcloop_tport *tport;
 	struct fcloop_rport *rport;
 	unsigned long flags;
@@ -1621,7 +1735,7 @@ static void __exit fcloop_exit(void)
 	for (;;) {
 		nport = list_first_entry_or_null(&fcloop_nports,
 						typeof(*nport), nport_list);
-		if (!nport)
+		if (!nport || !fcloop_nport_get(nport))
 			break;
 
 		tport = __unlink_target_port(nport);
@@ -1629,13 +1743,21 @@ static void __exit fcloop_exit(void)
 
 		spin_unlock_irqrestore(&fcloop_lock, flags);
 
-		ret = __targetport_unreg(nport, tport);
-		if (ret)
-			pr_warn("%s: Failed deleting target port\n", __func__);
+		if (tport) {
+			ret = __targetport_unreg(nport, tport);
+			if (ret)
+				pr_warn("%s: Failed deleting target port\n",
+					__func__);
+		}
 
-		ret = __remoteport_unreg(nport, rport);
-		if (ret)
-			pr_warn("%s: Failed deleting remote port\n", __func__);
+		if (rport) {
+			ret = __remoteport_unreg(nport, rport);
+			if (ret)
+				pr_warn("%s: Failed deleting remote port\n",
+					__func__);
+		}
+
+		fcloop_nport_put(nport);
 
 		spin_lock_irqsave(&fcloop_lock, flags);
 	}
@@ -1648,7 +1770,7 @@ static void __exit fcloop_exit(void)
 
 		spin_unlock_irqrestore(&fcloop_lock, flags);
 
-		ret = __wait_localport_unreg(lport);
+		ret = __localport_unreg(lport);
 		if (ret)
 			pr_warn("%s: Failed deleting local port\n", __func__);
 
@@ -1663,6 +1785,7 @@ static void __exit fcloop_exit(void)
 
 	device_destroy(&fcloop_class, MKDEV(0, 0));
 	class_unregister(&fcloop_class);
+	kmem_cache_destroy(lsreq_cache);
 }
 
 module_init(fcloop_init);