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author | Sagi Grimberg <sagi@grimberg.me> | 2018-11-22 02:17:37 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-17 11:24:40 +0300 |
commit | 5893e48f8f8a857b5bcd623d67d91668330a514a (patch) | |
tree | facb3b9e3dd0cf6a1c204d867d9174046b17e367 /drivers/nvme | |
parent | 1bda8b7996656c85005db7ac2a86b797c7f6cd1d (diff) | |
download | linux-5893e48f8f8a857b5bcd623d67d91668330a514a.tar.xz |
nvme: flush namespace scanning work just before removing namespaces
[ Upstream commit f6c8e432cb0479255322c5d0335b9f1699a0270c ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/nvme')
-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 0ba301f7e8b4..b7b2659e02fa 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3308,6 +3308,9 @@ 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 @@ -3463,7 +3466,6 @@ 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); |