SRP initiator patches for kernel 3.15

index d47ffc8..13e8983 100644
@@ -810,6 +810,7 @@ EXPORT_SYMBOL_GPL(srp_remove_host);
 
 /**
  * srp_stop_rport_timers - stop the transport layer recovery timers
+ * @rport: SRP remote port for which to stop the timers.
  *
  * Must be called after srp_remove_host() and scsi_remove_host(). The caller
  * must hold a reference on the rport (rport->dev) and on the SCSI host

index b11da5c..cdb05dd 100644
@@ -41,7 +41,6 @@ enum srp_rport_state {
  * @mutex:             Protects against concurrent rport reconnect /
  *                     fast_io_fail / dev_loss_tmo activity.
  * @state:             rport state.
- * @deleted:           Whether or not srp_rport_del() has already been invoked.
  * @reconnect_delay:   Reconnect delay in seconds.
  * @failed_reconnects: Number of failed reconnect attempts.
  * @reconnect_work:    Work structure used for scheduling reconnect attempts.

index 529b6bc..8903226 100644
@@ -2649,7 +2649,9 @@ static ssize_t srp_create_target(struct device *dev,
 	if (ret)
 		goto err_free_mem;
 
-	ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
+	ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
+	if (ret)
+		goto err_free_mem;
 
 	shost_printk(KERN_DEBUG, target->scsi_host, PFX
 		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "

index 8903226..2ec9c05 100644
@@ -1804,8 +1804,10 @@ static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
 				shost_printk(KERN_WARNING, shost,
 					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
 			else
-				shost_printk(KERN_WARNING, shost,
-					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
+				shost_printk(KERN_WARNING, shost, PFX
+					     "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
+					     target->path.sgid.raw,
+					     target->orig_dgid, reason);
 		} else
 			shost_printk(KERN_WARNING, shost,
 				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"

@@ -2653,15 +2655,6 @@ static ssize_t srp_create_target(struct device *dev,
 	if (ret)
 		goto err_free_mem;
 
-	shost_printk(KERN_DEBUG, target->scsi_host, PFX
-		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
-		     "service_id %016llx dgid %pI6\n",
-	       (unsigned long long) be64_to_cpu(target->id_ext),
-	       (unsigned long long) be64_to_cpu(target->ioc_guid),
-	       be16_to_cpu(target->path.pkey),
-	       (unsigned long long) be64_to_cpu(target->service_id),
-	       target->path.dgid.raw);
-
 	ret = srp_create_target_ib(target);
 	if (ret)
 		goto err_free_mem;

@@ -2681,6 +2674,14 @@ static ssize_t srp_create_target(struct device *dev,
 	if (ret)
 		goto err_disconnect;
 
+	shost_printk(KERN_DEBUG, target->scsi_host, PFX
+		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
+		     be64_to_cpu(target->id_ext),
+		     be64_to_cpu(target->ioc_guid),
+		     be16_to_cpu(target->path.pkey),
+		     be64_to_cpu(target->service_id),
+		     target->path.sgid.raw, target->path.dgid.raw);
+
 	return count;
 
 err_disconnect:

index 2ec9c05..3294f10 100644
@@ -2614,6 +2614,8 @@ static ssize_t srp_create_target(struct device *dev,
 	target->tl_retry_count	= 7;
 	target->queue_size	= SRP_DEFAULT_QUEUE_SIZE;
 
+	mutex_lock(&host->add_target_mutex);
+
 	ret = srp_parse_options(buf, target);
 	if (ret)
 		goto err;

@@ -2682,7 +2684,11 @@ static ssize_t srp_create_target(struct device *dev,
 		     be64_to_cpu(target->service_id),
 		     target->path.sgid.raw, target->path.dgid.raw);
 
-	return count;
+	ret = count;
+
+out:
+	mutex_unlock(&host->add_target_mutex);
+	return ret;
 
 err_disconnect:
 	srp_disconnect_target(target);

@@ -2698,8 +2704,7 @@ err_free_mem:
 
 err:
 	scsi_host_put(target_host);
-
-	return ret;
+	goto out;
 }
 
 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);

@@ -2735,6 +2740,7 @@ static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
 	INIT_LIST_HEAD(&host->target_list);
 	spin_lock_init(&host->target_lock);
 	init_completion(&host->released);
+	mutex_init(&host->add_target_mutex);
 	host->srp_dev = device;
 	host->port = port;
 

index 5756810..aad27b7 100644
@@ -105,6 +105,7 @@ struct srp_host {
 	spinlock_t		target_lock;
 	struct completion	released;
 	struct list_head	list;
+	struct mutex		add_target_mutex;
 };
 
 struct srp_request {

index 3294f10..481c873 100644
@@ -411,6 +411,8 @@ static void srp_path_rec_completion(int status,
 
 static int srp_lookup_path(struct srp_target_port *target)
 {
+	int ret;
+
 	target->path.numb_path = 1;
 
 	init_completion(&target->done);

@@ -431,7 +433,9 @@ static int srp_lookup_path(struct srp_target_port *target)
 	if (target->path_query_id < 0)
 		return target->path_query_id;
 
-	wait_for_completion(&target->done);
+	ret = wait_for_completion_interruptible(&target->done);
+	if (ret < 0)
+		return ret;
 
 	if (target->status < 0)
 		shost_printk(KERN_WARNING, target->scsi_host,

@@ -710,7 +714,9 @@ static int srp_connect_target(struct srp_target_port *target)
 		ret = srp_send_req(target);
 		if (ret)
 			return ret;
-		wait_for_completion(&target->done);
+		ret = wait_for_completion_interruptible(&target->done);
+		if (ret < 0)
+			return ret;
 
 		/*
 		 * The CM event handling code will set status to

index 481c873..a64e469 100644
@@ -1871,6 +1871,7 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 	case IB_CM_TIMEWAIT_EXIT:
 		shost_printk(KERN_ERR, target->scsi_host,
 			     PFX "connection closed\n");
+		comp = 1;
 
 		target->status = 0;
 		break;

index a64e469..c7091ef 100644
@@ -783,6 +783,7 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
  * srp_claim_req - Take ownership of the scmnd associated with a request.
  * @target: SRP target port.
  * @req: SRP request.
+ * @sdev: If not NULL, only take ownership for this SCSI device.
  * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
  *         ownership of @req->scmnd if it equals @scmnd.
  *

@@ -791,16 +792,17 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
  */
 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
 				       struct srp_request *req,
+				       struct scsi_device *sdev,
 				       struct scsi_cmnd *scmnd)
 {
 	unsigned long flags;
 
 	spin_lock_irqsave(&target->lock, flags);
-	if (!scmnd) {
+	if (req->scmnd &&
+	    (!sdev || req->scmnd->device == sdev) &&
+	    (!scmnd || req->scmnd == scmnd)) {
 		scmnd = req->scmnd;
 		req->scmnd = NULL;
-	} else if (req->scmnd == scmnd) {
-		req->scmnd = NULL;
 	} else {
 		scmnd = NULL;
 	}

@@ -827,9 +829,10 @@ static void srp_free_req(struct srp_target_port *target,
 }
 
 static void srp_finish_req(struct srp_target_port *target,
-			   struct srp_request *req, int result)
+			   struct srp_request *req, struct scsi_device *sdev,
+			   int result)
 {
-	struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
+	struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
 
 	if (scmnd) {
 		srp_free_req(target, req, scmnd, 0);

@@ -845,7 +848,7 @@ static void srp_terminate_io(struct srp_rport *rport)
 
 	for (i = 0; i < target->req_ring_size; ++i) {
 		struct srp_request *req = &target->req_ring[i];
-		srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
+		srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
 	}
 }
 

@@ -882,7 +885,7 @@ static int srp_rport_reconnect(struct srp_rport *rport)
 
 	for (i = 0; i < target->req_ring_size; ++i) {
 		struct srp_request *req = &target->req_ring[i];
-		srp_finish_req(target, req, DID_RESET << 16);
+		srp_finish_req(target, req, NULL, DID_RESET << 16);
 	}
 
 	INIT_LIST_HEAD(&target->free_tx);

@@ -1290,7 +1293,7 @@ static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 		complete(&target->tsk_mgmt_done);
 	} else {
 		req = &target->req_ring[rsp->tag];
-		scmnd = srp_claim_req(target, req, NULL);
+		scmnd = srp_claim_req(target, req, NULL, NULL);
 		if (!scmnd) {
 			shost_printk(KERN_ERR, target->scsi_host,
 				     "Null scmnd for RSP w/tag %016llx\n",

@@ -1509,7 +1512,7 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
 	struct srp_cmd *cmd;
 	struct ib_device *dev;
 	unsigned long flags;
-	int len, result;
+	int len, result, ret = 0;
 	const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
 
 	/*

@@ -1552,8 +1555,7 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
 	cmd->tag    = req->index;
 	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
 
-	req->scmnd    = scmnd;
-	req->cmd      = iu;
+	req->cmd = iu;
 
 	len = srp_map_data(scmnd, target, req);
 	if (len < 0) {

@@ -1565,7 +1567,14 @@ static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
 	ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
 				      DMA_TO_DEVICE);
 
-	if (srp_post_send(target, iu, len)) {
+	spin_lock_irqsave(&target->lock, flags);
+	if (srp_post_send(target, iu, len) == 0)
+		req->scmnd = scmnd;
+	else
+		ret = SCSI_MLQUEUE_HOST_BUSY;
+	spin_unlock_irqrestore(&target->lock, flags);
+
+	if (ret) {
 		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
 		goto err_unmap;
 	}

@@ -1574,7 +1583,7 @@ unlock_rport:
 	if (in_scsi_eh)
 		mutex_unlock(&rport->mutex);
 
-	return 0;
+	return ret;
 
 err_unmap:
 	srp_unmap_data(scmnd, target, req);

@@ -1588,10 +1597,8 @@ err_iu:
 err_unlock:
 	spin_unlock_irqrestore(&target->lock, flags);
 
-	if (in_scsi_eh)
-		mutex_unlock(&rport->mutex);
-
-	return SCSI_MLQUEUE_HOST_BUSY;
+	ret = SCSI_MLQUEUE_HOST_BUSY;
+	goto unlock_rport;
 }
 
 /*

@@ -2008,7 +2015,7 @@ static int srp_abort(struct scsi_cmnd *scmnd)
 
 	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
 
-	if (!req || !srp_claim_req(target, req, scmnd))
+	if (!req || !srp_claim_req(target, req, NULL, scmnd))
 		return SUCCESS;
 	if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
 			      SRP_TSK_ABORT_TASK) == 0)

@@ -2039,8 +2046,7 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
 
 	for (i = 0; i < target->req_ring_size; ++i) {
 		struct srp_request *req = &target->req_ring[i];
-		if (req->scmnd && req->scmnd->device == scmnd->device)
-			srp_finish_req(target, req, DID_RESET << 16);
+		srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
 	}
 
 	return SUCCESS;

index d47ffc8..13e8983 100644
@@ -810,6 +810,7 @@ EXPORT_SYMBOL_GPL(srp_remove_host);
 
 /**
  * srp_stop_rport_timers - stop the transport layer recovery timers
+ * @rport: SRP remote port for which to stop the timers.
  *
  * Must be called after srp_remove_host() and scsi_remove_host(). The caller
  * must hold a reference on the rport (rport->dev) and on the SCSI host

index b11da5c..cdb05dd 100644
@@ -41,7 +41,6 @@ enum srp_rport_state {
  * @mutex:             Protects against concurrent rport reconnect /
  *                     fast_io_fail / dev_loss_tmo activity.
  * @state:             rport state.
- * @deleted:           Whether or not srp_rport_del() has already been invoked.
  * @reconnect_delay:   Reconnect delay in seconds.
  * @failed_reconnects: Number of failed reconnect attempts.
  * @reconnect_work:    Work structure used for scheduling reconnect attempts.

index 529b6bc..8903226 100644
@@ -2649,7 +2649,9 @@ static ssize_t srp_create_target(struct device *dev,
 	if (ret)
 		goto err_free_mem;
 
-	ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
+	ret = ib_query_gid(ibdev, host->port, 0, &target->path.sgid);
+	if (ret)
+		goto err_free_mem;
 
 	shost_printk(KERN_DEBUG, target->scsi_host, PFX
 		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "

index 8903226..2ec9c05 100644
@@ -1804,8 +1804,10 @@ static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
 				shost_printk(KERN_WARNING, shost,
 					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
 			else
-				shost_printk(KERN_WARNING, shost,
-					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
+				shost_printk(KERN_WARNING, shost, PFX
+					     "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
+					     target->path.sgid.raw,
+					     target->orig_dgid, reason);
 		} else
 			shost_printk(KERN_WARNING, shost,
 				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"

@@ -2653,15 +2655,6 @@ static ssize_t srp_create_target(struct device *dev,
 	if (ret)
 		goto err_free_mem;
 
-	shost_printk(KERN_DEBUG, target->scsi_host, PFX
-		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
-		     "service_id %016llx dgid %pI6\n",
-	       (unsigned long long) be64_to_cpu(target->id_ext),
-	       (unsigned long long) be64_to_cpu(target->ioc_guid),
-	       be16_to_cpu(target->path.pkey),
-	       (unsigned long long) be64_to_cpu(target->service_id),
-	       target->path.dgid.raw);
-
 	ret = srp_create_target_ib(target);
 	if (ret)
 		goto err_free_mem;

@@ -2681,6 +2674,14 @@ static ssize_t srp_create_target(struct device *dev,
 	if (ret)
 		goto err_disconnect;
 
+	shost_printk(KERN_DEBUG, target->scsi_host, PFX
+		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
+		     be64_to_cpu(target->id_ext),
+		     be64_to_cpu(target->ioc_guid),
+		     be16_to_cpu(target->path.pkey),
+		     be64_to_cpu(target->service_id),
+		     target->path.sgid.raw, target->path.dgid.raw);
+
 	return count;
 
 err_disconnect:

@@ -2614,6 +2614,8 @@ static ssize_t srp_create_target(struct device *dev,
 	target->tl_retry_count	= 7;
 	target->queue_size	= SRP_DEFAULT_QUEUE_SIZE;
 
+	mutex_lock(&host->add_target_mutex);
+
 	ret = srp_parse_options(buf, target);
 	if (ret)
 		goto err;

@@ -2682,7 +2684,11 @@ static ssize_t srp_create_target(struct device *dev,
 		     be64_to_cpu(target->service_id),
 		     target->path.sgid.raw, target->path.dgid.raw);
 
-	return count;
+	ret = count;
+
+out:
+	mutex_unlock(&host->add_target_mutex);
+	return ret;
 
 err_disconnect:
 	srp_disconnect_target(target);

@@ -2698,8 +2704,7 @@ err_free_mem:
 
 err:
 	scsi_host_put(target_host);
-
-	return ret;
+	goto out;
 }
 
 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);

@@ -2735,6 +2740,7 @@ static struct srp_host *srp_add_port(struct

@@ -105,6 +105,7 @@ struct srp_host {
 	spinlock_t		target_lock;
 	struct completion	released;
 	struct list_head	list;
+	struct mutex		add_target_mutex;
 };
 
 struct srp_request {

index 3294f10..481c873 100644
@@ -411,6 +411,8 @@ static void srp_path_rec_completion(int status,
 
 static int srp_lookup_path(struct srp_target_port *target)
 {
+	int ret;
+
 	target->path.numb_path = 1;
 
 	init_completion(&target->done);

@@ -431,7 +433,9 @@ static int srp_lookup_path(struct srp_target_port *target)
 	if (target->path_query_id < 0)
 		return target->path_query_id;
 
-	wait_for_completion(&target->done);
+	ret = wait_for_completion_interruptible(&target->done);
+	if (ret < 0)
+		return ret;
 
 	if (target->status < 0)
 		shost_printk(KERN_WARNING, target->scsi_host,

@@ -710,7 +714,9 @@ static int srp_connect_target(struct srp_target_port *target)
 		ret = srp_send_req(target);
 		if (ret)
 			return ret;
-		wait_for_completion(&target->done);
+		ret = wait_for_completion_interruptible(&target->done);
+		if (ret < 0)
+			return ret;
 
 		/*
 		 * The CM event handling code will set status to

index 481c873..a64e469 100644
@@ -1871,6 +1871,7 @@ static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
 	case IB_CM_TIMEWAIT_EXIT:
 		shost_printk(KERN_ERR, target->scsi_host,
 			     PFX "connection closed\n");
+		comp = 1;
 
 		target->status = 0;
 		break;

index a64e469..66a908b 100644
@@ -783,6 +783,7 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
  * srp_claim_req - Take ownership of the scmnd associated with a request.
  * @target: SRP target port.
  * @req: SRP request.
+ * @sdev: If not NULL, only take ownership for this SCSI device.
  * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
  *         ownership of @req->scmnd if it equals @scmnd.
  *

@@ -791,16 +792,17 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
  */
 static struct scsi_cmnd *srp_claim_req(struct srp_target_port *target,
 				       struct srp_request *req,
+				       struct scsi_device *sdev,
 				       struct scsi_cmnd *scmnd)
 {
 	unsigned long flags;
 
 	spin_lock_irqsave(&target->lock, flags);
-	if (!scmnd) {
+	if (req->scmnd &&
+	    (!sdev || req->scmnd->device == sdev) &&
+	    (!scmnd || req->scmnd == scmnd)) {
 		scmnd = req->scmnd;
 		req->scmnd = NULL;
-	} else if (req->scmnd == scmnd) {
-		req->scmnd = NULL;
 	} else {
 		scmnd = NULL;
 	}

@@ -827,9 +829,10 @@ static void srp_free_req(struct srp_target_port *target,
 }
 
 static void srp_finish_req(struct srp_target_port *target,
-			   struct srp_request *req, int result)
+			   struct srp_request *req, struct scsi_device *sdev,
+			   int result)
 {
-	struct scsi_cmnd *scmnd = srp_claim_req(target, req, NULL);
+	struct scsi_cmnd *scmnd = srp_claim_req(target, req, sdev, NULL);
 
 	if (scmnd) {
 		srp_free_req(target, req, scmnd, 0);

@@ -841,11 +844,20 @@ static void srp_finish_req(struct srp_target_port *target,
 static void srp_terminate_io(struct srp_rport *rport)
 {
 	struct srp_target_port *target = rport->lld_data;
+	struct Scsi_Host *shost = target->scsi_host;
+	struct scsi_device *sdev;
 	int i;
 
+	/*
+	 * Invoking srp_terminate_io() while srp_queuecommand() is running
+	 * is not safe. Hence the warning statement below.
+	 */
+	shost_for_each_device(sdev, shost)
+		WARN_ON_ONCE(sdev->request_queue->request_fn_active);
+
 	for (i = 0; i < target->req_ring_size; ++i) {
 		struct srp_request *req = &target->req_ring[i];
-		srp_finish_req(target, req, DID_TRANSPORT_FAILFAST << 16);
+		srp_finish_req(target, req, NULL, DID_TRANSPORT_FAILFAST << 16);
 	}
 }
 

@@ -882,7 +894,7 @@ static int srp_rport_reconnect(struct srp_rport *rport)
 
 	for (i = 0; i < target->req_ring_size; ++i) {
 		struct srp_request *req = &target->req_ring[i];
-		srp_finish_req(target, req, DID_RESET << 16);
+		srp_finish_req(target, req, NULL, DID_RESET << 16);
 	}
 
 	INIT_LIST_HEAD(&target->free_tx);

@@ -1290,7 +1302,7 @@ static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 		complete(&target->tsk_mgmt_done);
 	} else {
 		req = &target->req_ring[rsp->tag];
-		scmnd = srp_claim_req(target, req, NULL);
+		scmnd = srp_claim_req(target, req, NULL, NULL);
 		if (!scmnd) {
 			shost_printk(KERN_ERR, target->scsi_host,
 				     "Null scmnd for RSP w/tag %016llx\n",

@@ -2008,7 +2020,7 @@ static int srp_abort(struct scsi_cmnd *scmnd)
 
 	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
 
-	if (!req || !srp_claim_req(target, req, scmnd))
+	if (!req || !srp_claim_req(target, req, NULL, scmnd))
 		return SUCCESS;
 	if (srp_send_tsk_mgmt(target, req->index, scmnd->device->lun,
 			      SRP_TSK_ABORT_TASK) == 0)

@@ -2039,8 +2051,7 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
 
 	for (i = 0; i < target->req_ring_size; ++i) {
 		struct srp_request *req = &target->req_ring[i];
-		if (req->scmnd && req->scmnd->device == scmnd->device)
-			srp_finish_req(target, req, DID_RESET << 16);
+		srp_finish_req(target, req, scmnd->device, DID_RESET << 16);
 	}
 
 	return SUCCESS;