nvme: fix regression when disconnect a recovering ctrl

We encountered a problem that the disconnect command hangs.
After analyzing the log and stack, we found that the triggering
process is as follows:
CPU0                          CPU1
                                nvme_rdma_error_recovery_work
                                  nvme_rdma_teardown_io_queues
nvme_do_delete_ctrl                 nvme_stop_queues
  nvme_remove_namespaces
  --clear ctrl->namespaces
                                    nvme_start_queues
                                    --no ns in ctrl->namespaces
    nvme_ns_remove                  return(because ctrl is deleting)
      blk_freeze_queue
        blk_mq_freeze_queue_wait
        --wait for ns to unquiesce to clean infligt IO, hang forever

This problem was not found in older kernels because we will flush
err work in nvme_stop_ctrl before nvme_remove_namespaces.It does not
seem to be modified for functional reasons, the patch can be revert
to solve the problem.

Revert commit 794a4cb3d2f7 ("nvme: remove the .stop_ctrl callout")

Signed-off-by: Ruozhu Li <liruozhu@huawei.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index b3d9c29..ec6ac29 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4595,6 +4595,8 @@ void nvme_stop_ctrl(struct nvme_ctrl *ctrl)
        nvme_stop_failfast_work(ctrl);
        flush_work(&ctrl->async_event_work);
        cancel_work_sync(&ctrl->fw_act_work);
+       if (ctrl->ops->stop_ctrl)
+               ctrl->ops->stop_ctrl(ctrl);
 }
 EXPORT_SYMBOL_GPL(nvme_stop_ctrl);
 

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 0da94b2..5558f88 100644 (file)
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -502,6 +502,7 @@ struct nvme_ctrl_ops {
        void (*free_ctrl)(struct nvme_ctrl *ctrl);
        void (*submit_async_event)(struct nvme_ctrl *ctrl);
        void (*delete_ctrl)(struct nvme_ctrl *ctrl);
+       void (*stop_ctrl)(struct nvme_ctrl *ctrl);
        int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size);
        void (*print_device_info)(struct nvme_ctrl *ctrl);
 };

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index f2a5e1e..46c2dcf 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1048,6 +1048,14 @@ static void nvme_rdma_teardown_io_queues(struct nvme_rdma_ctrl *ctrl,
        }
 }
 
+static void nvme_rdma_stop_ctrl(struct nvme_ctrl *nctrl)
+{
+       struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
+
+       cancel_work_sync(&ctrl->err_work);
+       cancel_delayed_work_sync(&ctrl->reconnect_work);
+}
+
 static void nvme_rdma_free_ctrl(struct nvme_ctrl *nctrl)
 {
        struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl);
@@ -2252,9 +2260,6 @@ static const struct blk_mq_ops nvme_rdma_admin_mq_ops = {
 
 static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown)
 {
-       cancel_work_sync(&ctrl->err_work);
-       cancel_delayed_work_sync(&ctrl->reconnect_work);
-
        nvme_rdma_teardown_io_queues(ctrl, shutdown);
        nvme_stop_admin_queue(&ctrl->ctrl);
        if (shutdown)
@@ -2304,6 +2309,7 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {
        .submit_async_event     = nvme_rdma_submit_async_event,
        .delete_ctrl            = nvme_rdma_delete_ctrl,
        .get_address            = nvmf_get_address,
+       .stop_ctrl              = nvme_rdma_stop_ctrl,
 };
 
 /*

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 009c2cf..7a9e6ff 100644 (file)
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2193,9 +2193,6 @@ static void nvme_tcp_error_recovery_work(struct work_struct *work)
 
 static void nvme_tcp_teardown_ctrl(struct nvme_ctrl *ctrl, bool shutdown)
 {
-       cancel_work_sync(&to_tcp_ctrl(ctrl)->err_work);
-       cancel_delayed_work_sync(&to_tcp_ctrl(ctrl)->connect_work);
-
        nvme_tcp_teardown_io_queues(ctrl, shutdown);
        nvme_stop_admin_queue(ctrl);
        if (shutdown)
@@ -2235,6 +2232,12 @@ out_fail:
        nvme_tcp_reconnect_or_remove(ctrl);
 }
 
+static void nvme_tcp_stop_ctrl(struct nvme_ctrl *ctrl)
+{
+       cancel_work_sync(&to_tcp_ctrl(ctrl)->err_work);
+       cancel_delayed_work_sync(&to_tcp_ctrl(ctrl)->connect_work);
+}
+
 static void nvme_tcp_free_ctrl(struct nvme_ctrl *nctrl)
 {
        struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
@@ -2556,6 +2559,7 @@ static const struct nvme_ctrl_ops nvme_tcp_ctrl_ops = {
        .submit_async_event     = nvme_tcp_submit_async_event,
        .delete_ctrl            = nvme_tcp_delete_ctrl,
        .get_address            = nvmf_get_address,
+       .stop_ctrl              = nvme_tcp_stop_ctrl,
 };
 
 static bool