Merge tag 'for-linus-20180217' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - NVMe pull request from Keith, with fixes all over the map for nvme.
   From various folks.

 - Classic polling fix, that avoids a latency issue where we still end
   up waiting for an interrupt in some cases. From Nitesh Shetty.

 - Comment typo fix from Minwoo Im.

* tag 'for-linus-20180217' of git://git.kernel.dk/linux-block:
  block: fix a typo in comment of BLK_MQ_POLL_STATS_BKTS
  nvme-rdma: fix sysfs invoked reset_ctrl error flow
  nvmet: Change return code of discard command if not supported
  nvme-pci: Fix timeouts in connecting state
  nvme-pci: Remap CMB SQ entries on every controller reset
  nvme: fix the deadlock in nvme_update_formats
  blk: optimization for classic polling
  nvme: Don't use a stack buffer for keep-alive command
  nvme_fc: cleanup io completion
  nvme_fc: correct abort race condition on resets
  nvme: Fix discard buffer overrun
  nvme: delete NVME_CTRL_LIVE --> NVME_CTRL_CONNECTING transition
  nvme-rdma: use NVME_CTRL_CONNECTING state to mark init process
  nvme: rename NVME_CTRL_RECONNECTING state to NVME_CTRL_CONNECTING

9 files changed, 108 insertions, 171 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index df93102e2149..357492712b0e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3164,6 +3164,7 @@ static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq)
 		cpu_relax();
 	}
 
+	__set_current_state(TASK_RUNNING);
 	return false;
 }
 
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index f431c32774f3..0fe7ea35c221 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -120,8 +120,12 @@ int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
 	int ret;
 
 	ret = nvme_reset_ctrl(ctrl);
-	if (!ret)
+	if (!ret) {
 		flush_work(&ctrl->reset_work);
+		if (ctrl->state != NVME_CTRL_LIVE)
+			ret = -ENETRESET;
+	}
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);
@@ -265,7 +269,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 	switch (new_state) {
 	case NVME_CTRL_ADMIN_ONLY:
 		switch (old_state) {
-		case NVME_CTRL_RECONNECTING:
+		case NVME_CTRL_CONNECTING:
 			changed = true;
 			/* FALLTHRU */
 		default:
@@ -276,7 +280,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		switch (old_state) {
 		case NVME_CTRL_NEW:
 		case NVME_CTRL_RESETTING:
-		case NVME_CTRL_RECONNECTING:
+		case NVME_CTRL_CONNECTING:
 			changed = true;
 			/* FALLTHRU */
 		default:
@@ -294,9 +298,9 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 			break;
 		}
 		break;
-	case NVME_CTRL_RECONNECTING:
+	case NVME_CTRL_CONNECTING:
 		switch (old_state) {
-		case NVME_CTRL_LIVE:
+		case NVME_CTRL_NEW:
 		case NVME_CTRL_RESETTING:
 			changed = true;
 			/* FALLTHRU */
@@ -309,7 +313,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl,
 		case NVME_CTRL_LIVE:
 		case NVME_CTRL_ADMIN_ONLY:
 		case NVME_CTRL_RESETTING:
-		case NVME_CTRL_RECONNECTING:
+		case NVME_CTRL_CONNECTING:
 			changed = true;
 			/* FALLTHRU */
 		default:
@@ -518,9 +522,11 @@ static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req,
 		u64 slba = nvme_block_nr(ns, bio->bi_iter.bi_sector);
 		u32 nlb = bio->bi_iter.bi_size >> ns->lba_shift;
 
-		range[n].cattr = cpu_to_le32(0);
-		range[n].nlb = cpu_to_le32(nlb);
-		range[n].slba = cpu_to_le64(slba);
+		if (n < segments) {
+			range[n].cattr = cpu_to_le32(0);
+			range[n].nlb = cpu_to_le32(nlb);
+			range[n].slba = cpu_to_le64(slba);
+		}
 		n++;
 	}
 
@@ -794,13 +800,9 @@ static void nvme_keep_alive_end_io(struct request *rq, blk_status_t status)
 
 static int nvme_keep_alive(struct nvme_ctrl *ctrl)
 {
-	struct nvme_command c;
 	struct request *rq;
 
-	memset(&c, 0, sizeof(c));
-	c.common.opcode = nvme_admin_keep_alive;
-
-	rq = nvme_alloc_request(ctrl->admin_q, &c, BLK_MQ_REQ_RESERVED,
+	rq = nvme_alloc_request(ctrl->admin_q, &ctrl->ka_cmd, BLK_MQ_REQ_RESERVED,
 			NVME_QID_ANY);
 	if (IS_ERR(rq))
 		return PTR_ERR(rq);
@@ -832,6 +834,8 @@ void nvme_start_keep_alive(struct nvme_ctrl *ctrl)
 		return;
 
 	INIT_DELAYED_WORK(&ctrl->ka_work, nvme_keep_alive_work);
+	memset(&ctrl->ka_cmd, 0, sizeof(ctrl->ka_cmd));
+	ctrl->ka_cmd.common.opcode = nvme_admin_keep_alive;
 	schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
 }
 EXPORT_SYMBOL_GPL(nvme_start_keep_alive);
@@ -1117,14 +1121,19 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 
 static void nvme_update_formats(struct nvme_ctrl *ctrl)
 {
-	struct nvme_ns *ns;
+	struct nvme_ns *ns, *next;
+	LIST_HEAD(rm_list);
 
 	mutex_lock(&ctrl->namespaces_mutex);
 	list_for_each_entry(ns, &ctrl->namespaces, list) {
-		if (ns->disk && nvme_revalidate_disk(ns->disk))
-			nvme_ns_remove(ns);
+		if (ns->disk && nvme_revalidate_disk(ns->disk)) {
+			list_move_tail(&ns->list, &rm_list);
+		}
 	}
 	mutex_unlock(&ctrl->namespaces_mutex);
+
+	list_for_each_entry_safe(ns, next, &rm_list, list)
+		nvme_ns_remove(ns);
 }
 
 static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects)
@@ -2687,7 +2696,7 @@ static ssize_t nvme_sysfs_show_state(struct device *dev,
 		[NVME_CTRL_LIVE]	= "live",
 		[NVME_CTRL_ADMIN_ONLY]	= "only-admin",
 		[NVME_CTRL_RESETTING]	= "resetting",
-		[NVME_CTRL_RECONNECTING]= "reconnecting",
+		[NVME_CTRL_CONNECTING]	= "connecting",
 		[NVME_CTRL_DELETING]	= "deleting",
 		[NVME_CTRL_DEAD]	= "dead",
 	};
diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h
index 25b19f722f5b..a3145d90c1d2 100644
--- a/drivers/nvme/host/fabrics.h
+++ b/drivers/nvme/host/fabrics.h
@@ -171,13 +171,14 @@ static inline blk_status_t nvmf_check_init_req(struct nvme_ctrl *ctrl,
 	    cmd->common.opcode != nvme_fabrics_command ||
 	    cmd->fabrics.fctype != nvme_fabrics_type_connect) {
 		/*
-		 * Reconnecting state means transport disruption, which can take
-		 * a long time and even might fail permanently, fail fast to
-		 * give upper layers a chance to failover.
+		 * Connecting state means transport disruption or initial
+		 * establishment, which can take a long time and even might
+		 * fail permanently, fail fast to give upper layers a chance
+		 * to failover.
 		 * Deleting state means that the ctrl will never accept commands
 		 * again, fail it permanently.
 		 */
-		if (ctrl->state == NVME_CTRL_RECONNECTING ||
+		if (ctrl->state == NVME_CTRL_CONNECTING ||
 		    ctrl->state == NVME_CTRL_DELETING) {
 			nvme_req(rq)->status = NVME_SC_ABORT_REQ;
 			return BLK_STS_IOERR;
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index b856d7c919d2..7f51f8414b97 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -55,9 +55,7 @@ struct nvme_fc_queue {
 
 enum nvme_fcop_flags {
 	FCOP_FLAGS_TERMIO	= (1 << 0),
-	FCOP_FLAGS_RELEASED	= (1 << 1),
-	FCOP_FLAGS_COMPLETE	= (1 << 2),
-	FCOP_FLAGS_AEN		= (1 << 3),
+	FCOP_FLAGS_AEN		= (1 << 1),
 };
 
 struct nvmefc_ls_req_op {
@@ -532,7 +530,7 @@ nvme_fc_resume_controller(struct nvme_fc_ctrl *ctrl)
 {
 	switch (ctrl->ctrl.state) {
 	case NVME_CTRL_NEW:
-	case NVME_CTRL_RECONNECTING:
+	case NVME_CTRL_CONNECTING:
 		/*
 		 * As all reconnects were suppressed, schedule a
 		 * connect.
@@ -777,7 +775,7 @@ nvme_fc_ctrl_connectivity_loss(struct nvme_fc_ctrl *ctrl)
 		}
 		break;
 
-	case NVME_CTRL_RECONNECTING:
+	case NVME_CTRL_CONNECTING:
 		/*
 		 * The association has already been terminated and the
 		 * controller is attempting reconnects.  No need to do anything
@@ -1470,7 +1468,6 @@ nvme_fc_xmt_disconnect_assoc(struct nvme_fc_ctrl *ctrl)
 
 /* *********************** NVME Ctrl Routines **************************** */
 
-static void __nvme_fc_final_op_cleanup(struct request *rq);
 static void nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg);
 
 static int
@@ -1512,13 +1509,19 @@ nvme_fc_exit_request(struct blk_mq_tag_set *set, struct request *rq,
 static int
 __nvme_fc_abort_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op)
 {
-	int state;
+	unsigned long flags;
+	int opstate;
+
+	spin_lock_irqsave(&ctrl->lock, flags);
+	opstate = atomic_xchg(&op->state, FCPOP_STATE_ABORTED);
+	if (opstate != FCPOP_STATE_ACTIVE)
+		atomic_set(&op->state, opstate);
+	else if (ctrl->flags & FCCTRL_TERMIO)
+		ctrl->iocnt++;
+	spin_unlock_irqrestore(&ctrl->lock, flags);
 
-	state = atomic_xchg(&op->state, FCPOP_STATE_ABORTED);
-	if (state != FCPOP_STATE_ACTIVE) {
-		atomic_set(&op->state, state);
+	if (opstate != FCPOP_STATE_ACTIVE)
 		return -ECANCELED;
-	}
 
 	ctrl->lport->ops->fcp_abort(&ctrl->lport->localport,
 					&ctrl->rport->remoteport,
@@ -1532,60 +1535,26 @@ static void
 nvme_fc_abort_aen_ops(struct nvme_fc_ctrl *ctrl)
 {
 	struct nvme_fc_fcp_op *aen_op = ctrl->aen_ops;
-	unsigned long flags;
-	int i, ret;
-
-	for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) {
-		if (atomic_read(&aen_op->state) != FCPOP_STATE_ACTIVE)
-			continue;
-
-		spin_lock_irqsave(&ctrl->lock, flags);
-		if (ctrl->flags & FCCTRL_TERMIO) {
-			ctrl->iocnt++;
-			aen_op->flags |= FCOP_FLAGS_TERMIO;
-		}
-		spin_unlock_irqrestore(&ctrl->lock, flags);
-
-		ret = __nvme_fc_abort_op(ctrl, aen_op);
-		if (ret) {
-			/*
-			 * if __nvme_fc_abort_op failed the io wasn't
-			 * active. Thus this call path is running in
-			 * parallel to the io complete. Treat as non-error.
-			 */
+	int i;
 
-			/* back out the flags/counters */
-			spin_lock_irqsave(&ctrl->lock, flags);
-			if (ctrl->flags & FCCTRL_TERMIO)
-				ctrl->iocnt--;
-			aen_op->flags &= ~FCOP_FLAGS_TERMIO;
-			spin_unlock_irqrestore(&ctrl->lock, flags);
-			return;
-		}
-	}
+	for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++)
+		__nvme_fc_abort_op(ctrl, aen_op);
 }
 
-static inline int
+static inline void
 __nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl,
-		struct nvme_fc_fcp_op *op)
+		struct nvme_fc_fcp_op *op, int opstate)
 {
 	unsigned long flags;
-	bool complete_rq = false;
 
-	spin_lock_irqsave(&ctrl->lock, flags);
-	if (unlikely(op->flags & FCOP_FLAGS_TERMIO)) {
+	if (opstate == FCPOP_STATE_ABORTED) {
+		spin_lock_irqsave(&ctrl->lock, flags);
 		if (ctrl->flags & FCCTRL_TERMIO) {
 			if (!--ctrl->iocnt)
 				wake_up(&ctrl->ioabort_wait);
 		}
+		spin_unlock_irqrestore(&ctrl->lock, flags);
 	}
-	if (op->flags & FCOP_FLAGS_RELEASED)
-		complete_rq = true;
-	else
-		op->flags |= FCOP_FLAGS_COMPLETE;
-	spin_unlock_irqrestore(&ctrl->lock, flags);
-
-	return complete_rq;
 }
 
 static void
@@ -1601,6 +1570,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 	__le16 status = cpu_to_le16(NVME_SC_SUCCESS << 1);
 	union nvme_result result;
 	bool terminate_assoc = true;
+	int opstate;
 
 	/*
 	 * WARNING:
@@ -1639,11 +1609,12 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 	 * association to be terminated.
 	 */
 
+	opstate = atomic_xchg(&op->state, FCPOP_STATE_COMPLETE);
+
 	fc_dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma,
 				sizeof(op->rsp_iu), DMA_FROM_DEVICE);
 
-	if (atomic_read(&op->state) == FCPOP_STATE_ABORTED ||
-			op->flags & FCOP_FLAGS_TERMIO)
+	if (opstate == FCPOP_STATE_ABORTED)
 		status = cpu_to_le16(NVME_SC_ABORT_REQ << 1);
 	else if (freq->status)
 		status = cpu_to_le16(NVME_SC_INTERNAL << 1);
@@ -1708,7 +1679,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 done:
 	if (op->flags & FCOP_FLAGS_AEN) {
 		nvme_complete_async_event(&queue->ctrl->ctrl, status, &result);
-		__nvme_fc_fcpop_chk_teardowns(ctrl, op);
+		__nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate);
 		atomic_set(&op->state, FCPOP_STATE_IDLE);
 		op->flags = FCOP_FLAGS_AEN;	/* clear other flags */
 		nvme_fc_ctrl_put(ctrl);
@@ -1722,13 +1693,11 @@ done:
 	if (status &&
 	    (blk_queue_dying(rq->q) ||
 	     ctrl->ctrl.state == NVME_CTRL_NEW ||
-	     ctrl->ctrl.state == NVME_CTRL_RECONNECTING))
+	     ctrl->ctrl.state == NVME_CTRL_CONNECTING))
 		status |= cpu_to_le16(NVME_SC_DNR << 1);
 
-	if (__nvme_fc_fcpop_chk_teardowns(ctrl, op))
-		__nvme_fc_final_op_cleanup(rq);
-	else
-		nvme_end_request(rq, status, result);
+	__nvme_fc_fcpop_chk_teardowns(ctrl, op, opstate);
+	nvme_end_request(rq, status, result);
 
 check_error:
 	if (terminate_assoc)
@@ -2415,46 +2384,16 @@ nvme_fc_submit_async_event(struct nvme_ctrl *arg)
 }
 
 static void
-__nvme_fc_final_op_cleanup(struct request *rq)
+nvme_fc_complete_rq(struct request *rq)
 {
 	struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
 	struct nvme_fc_ctrl *ctrl = op->ctrl;
 
 	atomic_set(&op->state, FCPOP_STATE_IDLE);
-	op->flags &= ~(FCOP_FLAGS_TERMIO | FCOP_FLAGS_RELEASED |
-			FCOP_FLAGS_COMPLETE);
 
 	nvme_fc_unmap_data(ctrl, rq, op);
 	nvme_complete_rq(rq);
 	nvme_fc_ctrl_put(ctrl);
-
-}
-
-static void
-nvme_fc_complete_rq(struct request *rq)
-{
-	struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(rq);
-	struct nvme_fc_ctrl *ctrl = op->ctrl;
-	unsigned long flags;
-	bool completed = false;
-
-	/*
-	 * the core layer, on controller resets after calling
-	 * nvme_shutdown_ctrl(), calls complete_rq without our
-	 * calling blk_mq_complete_request(), thus there may still
-	 * be live i/o outstanding with the LLDD. Means transport has
-	 * to track complete calls vs fcpio_done calls to know what
-	 * path to take on completes and dones.
-	 */
-	spin_lock_irqsave(&ctrl->lock, flags);
-	if (op->flags & FCOP_FLAGS_COMPLETE)
-		completed = true;
-	else
-		op->flags |= FCOP_FLAGS_RELEASED;
-	spin_unlock_irqrestore(&ctrl->lock, flags);
-
-	if (completed)
-		__nvme_fc_final_op_cleanup(rq);
 }
 
 /*
@@ -2476,35 +2415,11 @@ nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved)
 	struct nvme_ctrl *nctrl = data;
 	struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl);
 	struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(req);
-	unsigned long flags;
-	int status;
 
 	if (!blk_mq_request_started(req))
 		return;
 
-	spin_lock_irqsave(&ctrl->lock, flags);
-	if (ctrl->flags & FCCTRL_TERMIO) {
-		ctrl->iocnt++;
-		op->flags |= FCOP_FLAGS_TERMIO;
-	}
-	spin_unlock_irqrestore(&ctrl->lock, flags);
-
-	status = __nvme_fc_abort_op(ctrl, op);
-	if (status) {
-		/*
-		 * if __nvme_fc_abort_op failed the io wasn't
-		 * active. Thus this call path is running in
-		 * parallel to the io complete. Treat as non-error.
-		 */
-
-		/* back out the flags/counters */
-		spin_lock_irqsave(&ctrl->lock, flags);
-		if (ctrl->flags & FCCTRL_TERMIO)
-			ctrl->iocnt--;
-		op->flags &= ~FCOP_FLAGS_TERMIO;
-		spin_unlock_irqrestore(&ctrl->lock, flags);
-		return;
-	}
+	__nvme_fc_abort_op(ctrl, op);
 }
 
 
@@ -2943,7 +2858,7 @@ nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status)
 	unsigned long recon_delay = ctrl->ctrl.opts->reconnect_delay * HZ;
 	bool recon = true;
 
-	if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING)
+	if (ctrl->ctrl.state != NVME_CTRL_CONNECTING)
 		return;
 
 	if (portptr->port_state == FC_OBJSTATE_ONLINE)
@@ -2991,10 +2906,10 @@ nvme_fc_reset_ctrl_work(struct work_struct *work)
 	/* will block will waiting for io to terminate */
 	nvme_fc_delete_association(ctrl);
 
-	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) {
+	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
 		dev_err(ctrl->ctrl.device,
 			"NVME-FC{%d}: error_recovery: Couldn't change state "
-			"to RECONNECTING\n", ctrl->cnum);
+			"to CONNECTING\n", ctrl->cnum);
 		return;
 	}
 
@@ -3195,7 +3110,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 	 * transport errors (frame drop, LS failure) inherently must kill
 	 * the association. The transport is coded so that any command used
 	 * to create the association (prior to a LIVE state transition
-	 * while NEW or RECONNECTING) will fail if it completes in error or
+	 * while NEW or CONNECTING) will fail if it completes in error or
 	 * times out.
 	 *
 	 * As such: as the connect request was mostly likely due to a
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 8e4550fa08f8..0521e4707d1c 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -123,7 +123,7 @@ enum nvme_ctrl_state {
 	NVME_CTRL_LIVE,
 	NVME_CTRL_ADMIN_ONLY,    /* Only admin queue live */
 	NVME_CTRL_RESETTING,
-	NVME_CTRL_RECONNECTING,
+	NVME_CTRL_CONNECTING,
 	NVME_CTRL_DELETING,
 	NVME_CTRL_DEAD,
 };
@@ -183,6 +183,7 @@ struct nvme_ctrl {
 	struct work_struct scan_work;
 	struct work_struct async_event_work;
 	struct delayed_work ka_work;
+	struct nvme_command ka_cmd;
 	struct work_struct fw_act_work;
 
 	/* Power saving configuration */
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 6fe7af00a1f4..73036d2fbbd5 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1141,7 +1141,7 @@ static bool nvme_should_reset(struct nvme_dev *dev, u32 csts)
 	/* If there is a reset/reinit ongoing, we shouldn't reset again. */
 	switch (dev->ctrl.state) {
 	case NVME_CTRL_RESETTING:
-	case NVME_CTRL_RECONNECTING:
+	case NVME_CTRL_CONNECTING:
 		return false;
 	default:
 		break;
@@ -1215,13 +1215,17 @@ static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
 	 * cancellation error. All outstanding requests are completed on
 	 * shutdown, so we return BLK_EH_HANDLED.
 	 */
-	if (dev->ctrl.state == NVME_CTRL_RESETTING) {
+	switch (dev->ctrl.state) {
+	case NVME_CTRL_CONNECTING:
+	case NVME_CTRL_RESETTING:
 		dev_warn(dev->ctrl.device,
 			 "I/O %d QID %d timeout, disable controller\n",
 			 req->tag, nvmeq->qid);
 		nvme_dev_disable(dev, false);
 		nvme_req(req)->flags |= NVME_REQ_CANCELLED;
 		return BLK_EH_HANDLED;
+	default:
+		break;
 	}
 
 	/*
@@ -1364,18 +1368,14 @@ static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
 static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq,
 				int qid, int depth)
 {
-	if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) {
-		unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth),
-						      dev->ctrl.page_size);
-		nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset;
-		nvmeq->sq_cmds_io = dev->cmb + offset;
-	} else {
-		nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth),
-					&nvmeq->sq_dma_addr, GFP_KERNEL);
-		if (!nvmeq->sq_cmds)
-			return -ENOMEM;
-	}
+	/* CMB SQEs will be mapped before creation */
+	if (qid && dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS))
+		return 0;
 
+	nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth),
+					    &nvmeq->sq_dma_addr, GFP_KERNEL);
+	if (!nvmeq->sq_cmds)
+		return -ENOMEM;
 	return 0;
 }
 
@@ -1449,6 +1449,13 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
 	struct nvme_dev *dev = nvmeq->dev;
 	int result;
 
+	if (dev->cmb && use_cmb_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) {
+		unsigned offset = (qid - 1) * roundup(SQ_SIZE(nvmeq->q_depth),
+						      dev->ctrl.page_size);
+		nvmeq->sq_dma_addr = dev->cmb_bus_addr + offset;
+		nvmeq->sq_cmds_io = dev->cmb + offset;
+	}
+
 	nvmeq->cq_vector = qid - 1;
 	result = adapter_alloc_cq(dev, qid, nvmeq);
 	if (result < 0)
@@ -2288,12 +2295,12 @@ static void nvme_reset_work(struct work_struct *work)
 		nvme_dev_disable(dev, false);
 
 	/*
-	 * Introduce RECONNECTING state from nvme-fc/rdma transports to mark the
+	 * Introduce CONNECTING state from nvme-fc/rdma transports to mark the
 	 * initializing procedure here.
 	 */
-	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_RECONNECTING)) {
+	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_CONNECTING)) {
 		dev_warn(dev->ctrl.device,
-			"failed to mark controller RECONNECTING\n");
+			"failed to mark controller CONNECTING\n");
 		goto out;
 	}
 
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 2bc059f7d73c..3a51ed50eff2 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -887,7 +887,7 @@ free_ctrl:
 static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl)
 {
 	/* If we are resetting/deleting then do nothing */
-	if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) {
+	if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) {
 		WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW ||
 			ctrl->ctrl.state == NVME_CTRL_LIVE);
 		return;
@@ -973,7 +973,7 @@ static void nvme_rdma_error_recovery_work(struct work_struct *work)
 	blk_mq_unquiesce_queue(ctrl->ctrl.admin_q);
 	nvme_start_queues(&ctrl->ctrl);
 
-	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) {
+	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
 		/* state change failure should never happen */
 		WARN_ON_ONCE(1);
 		return;
@@ -1756,7 +1756,7 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
 	nvme_stop_ctrl(&ctrl->ctrl);
 	nvme_rdma_shutdown_ctrl(ctrl, false);
 
-	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) {
+	if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) {
 		/* state change failure should never happen */
 		WARN_ON_ONCE(1);
 		return;
@@ -1784,11 +1784,8 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
 	return;
 
 out_fail:
-	dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
-	nvme_remove_namespaces(&ctrl->ctrl);
-	nvme_rdma_shutdown_ctrl(ctrl, true);
-	nvme_uninit_ctrl(&ctrl->ctrl);
-	nvme_put_ctrl(&ctrl->ctrl);
+	++ctrl->ctrl.nr_reconnects;
+	nvme_rdma_reconnect_or_remove(ctrl);
 }
 
 static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
@@ -1942,6 +1939,9 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 	if (!ctrl->queues)
 		goto out_uninit_ctrl;
 
+	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING);
+	WARN_ON_ONCE(!changed);
+
 	ret = nvme_rdma_configure_admin_queue(ctrl, true);
 	if (ret)
 		goto out_kfree_queues;
diff --git a/drivers/nvme/target/io-cmd.c b/drivers/nvme/target/io-cmd.c
index 0a4372a016f2..28bbdff4a88b 100644
--- a/drivers/nvme/target/io-cmd.c
+++ b/drivers/nvme/target/io-cmd.c
@@ -105,10 +105,13 @@ static void nvmet_execute_flush(struct nvmet_req *req)
 static u16 nvmet_discard_range(struct nvmet_ns *ns,
 		struct nvme_dsm_range *range, struct bio **bio)
 {
-	if (__blkdev_issue_discard(ns->bdev,
+	int ret;
+
+	ret = __blkdev_issue_discard(ns->bdev,
 			le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
 			le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
-			GFP_KERNEL, 0, bio))
+			GFP_KERNEL, 0, bio);
+	if (ret && ret != -EOPNOTSUPP)
 		return NVME_SC_INTERNAL | NVME_SC_DNR;
 	return 0;
 }
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 4f3df807cf8f..ed63f3b69c12 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -49,7 +49,7 @@ struct blk_stat_callback;
 #define BLKDEV_MIN_RQ	4
 #define BLKDEV_MAX_RQ	128	/* Default maximum */
 
-/* Must be consisitent with blk_mq_poll_stats_bkt() */
+/* Must be consistent with blk_mq_poll_stats_bkt() */
 #define BLK_MQ_POLL_STATS_BKTS 16
 
 /*