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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
        Sagi Grimberg <sagi@grimberg.me>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Christoph Hellwig <hch@lst.de>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 034/132] nvmet: use a private workqueue instead of the system workqueue
Date:   Mon, 23 May 2022 19:04:03 +0200
Message-Id: <20220523165829.132547750@linuxfoundation.org>
In-Reply-To: <20220523165823.492309987@linuxfoundation.org>
References: <20220523165823.492309987@linuxfoundation.org>
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Precedence: bulk

From: Sagi Grimberg <sagi@grimberg.me>

[ Upstream commit 8832cf922151e9dfa2821736beb0ae2dd3968b6e ]

Any attempt to flush kernel-global WQs has possibility of deadlock
so we should simply stop using them, instead introduce nvmet_wq
which is the generic nvmet workqueue for work elements that
don't explicitly require a dedicated workqueue (by the mere fact
that they are using the system_wq).

Changes were done using the following replaces:

 - s/schedule_work(/queue_work(nvmet_wq, /g
 - s/schedule_delayed_work(/queue_delayed_work(nvmet_wq, /g
 - s/flush_scheduled_work()/flush_workqueue(nvmet_wq)/g

Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nvme/target/admin-cmd.c   |  2 +-
 drivers/nvme/target/configfs.c    |  2 +-
 drivers/nvme/target/core.c        | 24 ++++++++++++++++++------
 drivers/nvme/target/fc.c          |  8 ++++----
 drivers/nvme/target/fcloop.c      | 16 ++++++++--------
 drivers/nvme/target/io-cmd-file.c |  6 +++---
 drivers/nvme/target/loop.c        |  4 ++--
 drivers/nvme/target/nvmet.h       |  1 +
 drivers/nvme/target/passthru.c    |  2 +-
 drivers/nvme/target/rdma.c        | 12 ++++++------
 drivers/nvme/target/tcp.c         | 10 +++++-----
 11 files changed, 50 insertions(+), 37 deletions(-)

diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index aa6d84d8848e..52bb262d267a 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -978,7 +978,7 @@ void nvmet_execute_async_event(struct nvmet_req *req)
 	ctrl->async_event_cmds[ctrl->nr_async_event_cmds++] = req;
 	mutex_unlock(&ctrl->lock);
 
-	schedule_work(&ctrl->async_event_work);
+	queue_work(nvmet_wq, &ctrl->async_event_work);
 }
 
 void nvmet_execute_keep_alive(struct nvmet_req *req)
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 496d775c6770..cea30e4f5053 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1554,7 +1554,7 @@ static void nvmet_port_release(struct config_item *item)
 	struct nvmet_port *port = to_nvmet_port(item);
 
 	/* Let inflight controllers teardown complete */
-	flush_scheduled_work();
+	flush_workqueue(nvmet_wq);
 	list_del(&port->global_entry);
 
 	kfree(port->ana_state);
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index b8425fa34300..a8dafe8670f2 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -20,6 +20,9 @@ struct workqueue_struct *zbd_wq;
 static const struct nvmet_fabrics_ops *nvmet_transports[NVMF_TRTYPE_MAX];
 static DEFINE_IDA(cntlid_ida);
 
+struct workqueue_struct *nvmet_wq;
+EXPORT_SYMBOL_GPL(nvmet_wq);
+
 /*
  * This read/write semaphore is used to synchronize access to configuration
  * information on a target system that will result in discovery log page
@@ -205,7 +208,7 @@ void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
 	list_add_tail(&aen->entry, &ctrl->async_events);
 	mutex_unlock(&ctrl->lock);
 
-	schedule_work(&ctrl->async_event_work);
+	queue_work(nvmet_wq, &ctrl->async_event_work);
 }
 
 static void nvmet_add_to_changed_ns_log(struct nvmet_ctrl *ctrl, __le32 nsid)
@@ -385,7 +388,7 @@ static void nvmet_keep_alive_timer(struct work_struct *work)
 	if (reset_tbkas) {
 		pr_debug("ctrl %d reschedule traffic based keep-alive timer\n",
 			ctrl->cntlid);
-		schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
+		queue_delayed_work(nvmet_wq, &ctrl->ka_work, ctrl->kato * HZ);
 		return;
 	}
 
@@ -403,7 +406,7 @@ void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
 	pr_debug("ctrl %d start keep-alive timer for %d secs\n",
 		ctrl->cntlid, ctrl->kato);
 
-	schedule_delayed_work(&ctrl->ka_work, ctrl->kato * HZ);
+	queue_delayed_work(nvmet_wq, &ctrl->ka_work, ctrl->kato * HZ);
 }
 
 void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
@@ -1477,7 +1480,7 @@ void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
 	mutex_lock(&ctrl->lock);
 	if (!(ctrl->csts & NVME_CSTS_CFS)) {
 		ctrl->csts |= NVME_CSTS_CFS;
-		schedule_work(&ctrl->fatal_err_work);
+		queue_work(nvmet_wq, &ctrl->fatal_err_work);
 	}
 	mutex_unlock(&ctrl->lock);
 }
@@ -1617,9 +1620,15 @@ static int __init nvmet_init(void)
 		goto out_free_zbd_work_queue;
 	}
 
+	nvmet_wq = alloc_workqueue("nvmet-wq", WQ_MEM_RECLAIM, 0);
+	if (!nvmet_wq) {
+		error = -ENOMEM;
+		goto out_free_buffered_work_queue;
+	}
+
 	error = nvmet_init_discovery();
 	if (error)
-		goto out_free_work_queue;
+		goto out_free_nvmet_work_queue;
 
 	error = nvmet_init_configfs();
 	if (error)
@@ -1628,7 +1637,9 @@ static int __init nvmet_init(void)
 
 out_exit_discovery:
 	nvmet_exit_discovery();
-out_free_work_queue:
+out_free_nvmet_work_queue:
+	destroy_workqueue(nvmet_wq);
+out_free_buffered_work_queue:
 	destroy_workqueue(buffered_io_wq);
 out_free_zbd_work_queue:
 	destroy_workqueue(zbd_wq);
@@ -1640,6 +1651,7 @@ static void __exit nvmet_exit(void)
 	nvmet_exit_configfs();
 	nvmet_exit_discovery();
 	ida_destroy(&cntlid_ida);
+	destroy_workqueue(nvmet_wq);
 	destroy_workqueue(buffered_io_wq);
 	destroy_workqueue(zbd_wq);
 
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 22b5108168a6..c43bc5e1c7a2 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1491,7 +1491,7 @@ __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
 	list_for_each_entry_rcu(assoc, &tgtport->assoc_list, a_list) {
 		if (!nvmet_fc_tgt_a_get(assoc))
 			continue;
-		if (!schedule_work(&assoc->del_work))
+		if (!queue_work(nvmet_wq, &assoc->del_work))
 			/* already deleting - release local reference */
 			nvmet_fc_tgt_a_put(assoc);
 	}
@@ -1546,7 +1546,7 @@ nvmet_fc_invalidate_host(struct nvmet_fc_target_port *target_port,
 			continue;
 		assoc->hostport->invalid = 1;
 		noassoc = false;
-		if (!schedule_work(&assoc->del_work))
+		if (!queue_work(nvmet_wq, &assoc->del_work))
 			/* already deleting - release local reference */
 			nvmet_fc_tgt_a_put(assoc);
 	}
@@ -1592,7 +1592,7 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
 		nvmet_fc_tgtport_put(tgtport);
 
 		if (found_ctrl) {
-			if (!schedule_work(&assoc->del_work))
+			if (!queue_work(nvmet_wq, &assoc->del_work))
 				/* already deleting - release local reference */
 				nvmet_fc_tgt_a_put(assoc);
 			return;
@@ -2060,7 +2060,7 @@ nvmet_fc_rcv_ls_req(struct nvmet_fc_target_port *target_port,
 	iod->rqstdatalen = lsreqbuf_len;
 	iod->hosthandle = hosthandle;
 
-	schedule_work(&iod->work);
+	queue_work(nvmet_wq, &iod->work);
 
 	return 0;
 }
diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 54606f1872b4..5c16372f3b53 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -360,7 +360,7 @@ fcloop_h2t_ls_req(struct nvme_fc_local_port *localport,
 		spin_lock(&rport->lock);
 		list_add_tail(&rport->ls_list, &tls_req->ls_list);
 		spin_unlock(&rport->lock);
-		schedule_work(&rport->ls_work);
+		queue_work(nvmet_wq, &rport->ls_work);
 		return ret;
 	}
 
@@ -393,7 +393,7 @@ fcloop_h2t_xmt_ls_rsp(struct nvmet_fc_target_port *targetport,
 		spin_lock(&rport->lock);
 		list_add_tail(&rport->ls_list, &tls_req->ls_list);
 		spin_unlock(&rport->lock);
-		schedule_work(&rport->ls_work);
+		queue_work(nvmet_wq, &rport->ls_work);
 	}
 
 	return 0;
@@ -448,7 +448,7 @@ fcloop_t2h_ls_req(struct nvmet_fc_target_port *targetport, void *hosthandle,
 		spin_lock(&tport->lock);
 		list_add_tail(&tport->ls_list, &tls_req->ls_list);
 		spin_unlock(&tport->lock);
-		schedule_work(&tport->ls_work);
+		queue_work(nvmet_wq, &tport->ls_work);
 		return ret;
 	}
 
@@ -480,7 +480,7 @@ fcloop_t2h_xmt_ls_rsp(struct nvme_fc_local_port *localport,
 		spin_lock(&tport->lock);
 		list_add_tail(&tport->ls_list, &tls_req->ls_list);
 		spin_unlock(&tport->lock);
-		schedule_work(&tport->ls_work);
+		queue_work(nvmet_wq, &tport->ls_work);
 	}
 
 	return 0;
@@ -520,7 +520,7 @@ fcloop_tgt_discovery_evt(struct nvmet_fc_target_port *tgtport)
 	tgt_rscn->tport = tgtport->private;
 	INIT_WORK(&tgt_rscn->work, fcloop_tgt_rscn_work);
 
-	schedule_work(&tgt_rscn->work);
+	queue_work(nvmet_wq, &tgt_rscn->work);
 }
 
 static void
@@ -739,7 +739,7 @@ fcloop_fcp_req(struct nvme_fc_local_port *localport,
 	INIT_WORK(&tfcp_req->tio_done_work, fcloop_tgt_fcprqst_done_work);
 	kref_init(&tfcp_req->ref);
 
-	schedule_work(&tfcp_req->fcp_rcv_work);
+	queue_work(nvmet_wq, &tfcp_req->fcp_rcv_work);
 
 	return 0;
 }
@@ -921,7 +921,7 @@ fcloop_fcp_req_release(struct nvmet_fc_target_port *tgtport,
 {
 	struct fcloop_fcpreq *tfcp_req = tgt_fcp_req_to_fcpreq(tgt_fcpreq);
 
-	schedule_work(&tfcp_req->tio_done_work);
+	queue_work(nvmet_wq, &tfcp_req->tio_done_work);
 }
 
 static void
@@ -976,7 +976,7 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
 
 	if (abortio)
 		/* leave the reference while the work item is scheduled */
-		WARN_ON(!schedule_work(&tfcp_req->abort_rcv_work));
+		WARN_ON(!queue_work(nvmet_wq, &tfcp_req->abort_rcv_work));
 	else  {
 		/*
 		 * as the io has already had the done callback made,
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index df7e033dd273..228871d48106 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -292,7 +292,7 @@ static void nvmet_file_execute_flush(struct nvmet_req *req)
 	if (!nvmet_check_transfer_len(req, 0))
 		return;
 	INIT_WORK(&req->f.work, nvmet_file_flush_work);
-	schedule_work(&req->f.work);
+	queue_work(nvmet_wq, &req->f.work);
 }
 
 static void nvmet_file_execute_discard(struct nvmet_req *req)
@@ -352,7 +352,7 @@ static void nvmet_file_execute_dsm(struct nvmet_req *req)
 	if (!nvmet_check_data_len_lte(req, nvmet_dsm_len(req)))
 		return;
 	INIT_WORK(&req->f.work, nvmet_file_dsm_work);
-	schedule_work(&req->f.work);
+	queue_work(nvmet_wq, &req->f.work);
 }
 
 static void nvmet_file_write_zeroes_work(struct work_struct *w)
@@ -382,7 +382,7 @@ static void nvmet_file_execute_write_zeroes(struct nvmet_req *req)
 	if (!nvmet_check_transfer_len(req, 0))
 		return;
 	INIT_WORK(&req->f.work, nvmet_file_write_zeroes_work);
-	schedule_work(&req->f.work);
+	queue_work(nvmet_wq, &req->f.work);
 }
 
 u16 nvmet_file_parse_io_cmd(struct nvmet_req *req)
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 0285ccc7541f..2553f487c9f2 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -166,7 +166,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 		iod->req.transfer_len = blk_rq_payload_bytes(req);
 	}
 
-	schedule_work(&iod->work);
+	queue_work(nvmet_wq, &iod->work);
 	return BLK_STS_OK;
 }
 
@@ -187,7 +187,7 @@ static void nvme_loop_submit_async_event(struct nvme_ctrl *arg)
 		return;
 	}
 
-	schedule_work(&iod->work);
+	queue_work(nvmet_wq, &iod->work);
 }
 
 static int nvme_loop_init_iod(struct nvme_loop_ctrl *ctrl,
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 7143c7fa7464..dbeb0b8c1194 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -365,6 +365,7 @@ struct nvmet_req {
 
 extern struct workqueue_struct *buffered_io_wq;
 extern struct workqueue_struct *zbd_wq;
+extern struct workqueue_struct *nvmet_wq;
 
 static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
 {
diff --git a/drivers/nvme/target/passthru.c b/drivers/nvme/target/passthru.c
index f0efb3537989..6220e1dd961a 100644
--- a/drivers/nvme/target/passthru.c
+++ b/drivers/nvme/target/passthru.c
@@ -281,7 +281,7 @@ static void nvmet_passthru_execute_cmd(struct nvmet_req *req)
 	if (req->p.use_workqueue || effects) {
 		INIT_WORK(&req->p.work, nvmet_passthru_execute_cmd_work);
 		req->p.rq = rq;
-		schedule_work(&req->p.work);
+		queue_work(nvmet_wq, &req->p.work);
 	} else {
 		rq->end_io_data = req;
 		blk_execute_rq_nowait(ns ? ns->disk : NULL, rq, 0,
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index f1eedbf493d5..18e082091c82 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -1583,7 +1583,7 @@ static int nvmet_rdma_queue_connect(struct rdma_cm_id *cm_id,
 
 	if (queue->host_qid == 0) {
 		/* Let inflight controller teardown complete */
-		flush_scheduled_work();
+		flush_workqueue(nvmet_wq);
 	}
 
 	ret = nvmet_rdma_cm_accept(cm_id, queue, &event->param.conn);
@@ -1668,7 +1668,7 @@ static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue)
 
 	if (disconnect) {
 		rdma_disconnect(queue->cm_id);
-		schedule_work(&queue->release_work);
+		queue_work(nvmet_wq, &queue->release_work);
 	}
 }
 
@@ -1698,7 +1698,7 @@ static void nvmet_rdma_queue_connect_fail(struct rdma_cm_id *cm_id,
 	mutex_unlock(&nvmet_rdma_queue_mutex);
 
 	pr_err("failed to connect queue %d\n", queue->idx);
-	schedule_work(&queue->release_work);
+	queue_work(nvmet_wq, &queue->release_work);
 }
 
 /**
@@ -1772,7 +1772,7 @@ static int nvmet_rdma_cm_handler(struct rdma_cm_id *cm_id,
 		if (!queue) {
 			struct nvmet_rdma_port *port = cm_id->context;
 
-			schedule_delayed_work(&port->repair_work, 0);
+			queue_delayed_work(nvmet_wq, &port->repair_work, 0);
 			break;
 		}
 		fallthrough;
@@ -1902,7 +1902,7 @@ static void nvmet_rdma_repair_port_work(struct work_struct *w)
 	nvmet_rdma_disable_port(port);
 	ret = nvmet_rdma_enable_port(port);
 	if (ret)
-		schedule_delayed_work(&port->repair_work, 5 * HZ);
+		queue_delayed_work(nvmet_wq, &port->repair_work, 5 * HZ);
 }
 
 static int nvmet_rdma_add_port(struct nvmet_port *nport)
@@ -2046,7 +2046,7 @@ static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data
 	}
 	mutex_unlock(&nvmet_rdma_queue_mutex);
 
-	flush_scheduled_work();
+	flush_workqueue(nvmet_wq);
 }
 
 static struct ib_client nvmet_rdma_ib_client = {
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 2b8bab28417b..f592e5f7f5f3 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -1251,7 +1251,7 @@ static void nvmet_tcp_schedule_release_queue(struct nvmet_tcp_queue *queue)
 	spin_lock(&queue->state_lock);
 	if (queue->state != NVMET_TCP_Q_DISCONNECTING) {
 		queue->state = NVMET_TCP_Q_DISCONNECTING;
-		schedule_work(&queue->release_work);
+		queue_work(nvmet_wq, &queue->release_work);
 	}
 	spin_unlock(&queue->state_lock);
 }
@@ -1662,7 +1662,7 @@ static void nvmet_tcp_listen_data_ready(struct sock *sk)
 		goto out;
 
 	if (sk->sk_state == TCP_LISTEN)
-		schedule_work(&port->accept_work);
+		queue_work(nvmet_wq, &port->accept_work);
 out:
 	read_unlock_bh(&sk->sk_callback_lock);
 }
@@ -1793,7 +1793,7 @@ static u16 nvmet_tcp_install_queue(struct nvmet_sq *sq)
 
 	if (sq->qid == 0) {
 		/* Let inflight controller teardown complete */
-		flush_scheduled_work();
+		flush_workqueue(nvmet_wq);
 	}
 
 	queue->nr_cmds = sq->size * 2;
@@ -1854,12 +1854,12 @@ static void __exit nvmet_tcp_exit(void)
 
 	nvmet_unregister_transport(&nvmet_tcp_ops);
 
-	flush_scheduled_work();
+	flush_workqueue(nvmet_wq);
 	mutex_lock(&nvmet_tcp_queue_mutex);
 	list_for_each_entry(queue, &nvmet_tcp_queue_list, queue_list)
 		kernel_sock_shutdown(queue->sock, SHUT_RDWR);
 	mutex_unlock(&nvmet_tcp_queue_mutex);
-	flush_scheduled_work();
+	flush_workqueue(nvmet_wq);
 
 	destroy_workqueue(nvmet_tcp_wq);
 }
-- 
2.35.1