diff options
| author | Sagi Grimberg <sagi@grimberg.me> | 2018-11-21 15:17:37 -0800 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-11-30 17:23:23 +0100 |
| commit | f6c8e432cb0479255322c5d0335b9f1699a0270c (patch) | |
| tree | cf7557ac6052f56b3d3f88892643f7d0d75c19be /drivers | |
| parent | 14a1336e6fff47dd1028b484d6c802105c58e2ee (diff) | |
| download | linux-f6c8e432cb0479255322c5d0335b9f1699a0270c.tar.gz | |
nvme: flush namespace scanning work just before removing namespaces
nvme_stop_ctrl can be called also for reset flow and there is no need to flush the scan_work as namespaces are not being removed. This can cause deadlock in rdma, fc and loop drivers since nvme_stop_ctrl barriers before controller teardown (and specifically I/O cancellation of the scan_work itself) takes place, but the scan_work will be blocked anyways so there is no need to flush it. Instead, move scan_work flush to nvme_remove_namespaces() where it really needs to flush. Reported-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Keith Busch <keith.busch@intel.com> Reviewed by: James Smart <jsmart2021@gmail.com> Tested-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/nvme/host/core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index bb39b91253c2..3cf1b773158e 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3314,6 +3314,9 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl) struct nvme_ns *ns, *next; LIST_HEAD(ns_list); + /* prevent racing with ns scanning */ + flush_work(&ctrl->scan_work); + /* * The dead states indicates the controller was not gracefully * disconnected. In that case, we won't be able to flush any data while @@ -3476,7 +3479,6 @@ void nvme_stop_ctrl(struct nvme_ctrl *ctrl) nvme_mpath_stop(ctrl); nvme_stop_keep_alive(ctrl); flush_work(&ctrl->async_event_work); - flush_work(&ctrl->scan_work); cancel_work_sync(&ctrl->fw_act_work); if (ctrl->ops->stop_ctrl) ctrl->ops->stop_ctrl(ctrl); |