From: Ruozhu Li liruozhu@huawei.com
[ Upstream commit f7f70f4aa09dc43d7455c060143e86a017c30548 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/core.c | 2 ++ drivers/nvme/host/nvme.h | 1 + drivers/nvme/host/rdma.c | 12 +++++++++--- drivers/nvme/host/tcp.c | 10 +++++++--- 4 files changed, 19 insertions(+), 6 deletions(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 79e22618817d..d2ea6ca37c41 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -4034,6 +4034,8 @@ void nvme_stop_ctrl(struct nvme_ctrl *ctrl) nvme_stop_keep_alive(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 1d1431dd4f9e..81a5b968253f 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -402,6 +402,7 @@ 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); };
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 4213c71b02a4..d5d7b2f98edc 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -973,6 +973,14 @@ 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); @@ -1947,9 +1955,6 @@ 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); blk_mq_quiesce_queue(ctrl->ctrl.admin_q); if (shutdown) @@ -1999,6 +2004,7 @@ 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 4378344f0e7a..2a27ac9aedba 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1973,9 +1973,6 @@ 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); blk_mq_quiesce_queue(ctrl->admin_q); if (shutdown) @@ -2014,6 +2011,12 @@ static void nvme_reset_ctrl_work(struct work_struct *work) 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); @@ -2322,6 +2325,7 @@ 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