diff options
| author | Michael Liang <mliang@purestorage.com> | 2023-07-07 23:21:57 +0200 |
|---|---|---|
| committer | Keith Busch <kbusch@kernel.org> | 2023-07-12 18:29:51 +0200 |
| commit | ee6fdc5055e916b1dd497f11260d4901c4c1e55e (patch) | |
| tree | 7b46664c17da474c76c5bd70078f7853f499f490 /drivers | |
| parent | nvme-fc: return non-zero status code when fails to create association (diff) | |
| download | linux-ee6fdc5055e916b1dd497f11260d4901c4c1e55e.tar.xz linux-ee6fdc5055e916b1dd497f11260d4901c4c1e55e.zip | |
nvme-fc: fix race between error recovery and creating association
There is a small race window between nvme-fc association creation and error
recovery. Fix this race condition by protecting accessing to controller
state and ASSOC_FAILED flag under nvme-fc controller lock.
Signed-off-by: Michael Liang <mliang@purestorage.com>
Reviewed-by: Caleb Sander <csander@purestorage.com>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/nvme/host/fc.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index ad9336343e01..1cd2bf82319a 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -2548,17 +2548,24 @@ nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg) * the controller. Abort any ios on the association and let the * create_association error path resolve things. */ - if (ctrl->ctrl.state == NVME_CTRL_CONNECTING) { - __nvme_fc_abort_outstanding_ios(ctrl, true); + enum nvme_ctrl_state state; + unsigned long flags; + + spin_lock_irqsave(&ctrl->lock, flags); + state = ctrl->ctrl.state; + if (state == NVME_CTRL_CONNECTING) { set_bit(ASSOC_FAILED, &ctrl->flags); + spin_unlock_irqrestore(&ctrl->lock, flags); + __nvme_fc_abort_outstanding_ios(ctrl, true); dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: transport error during (re)connect\n", ctrl->cnum); return; } + spin_unlock_irqrestore(&ctrl->lock, flags); /* Otherwise, only proceed if in LIVE state - e.g. on first error */ - if (ctrl->ctrl.state != NVME_CTRL_LIVE) + if (state != NVME_CTRL_LIVE) return; dev_warn(ctrl->ctrl.device, @@ -3172,12 +3179,16 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) else ret = nvme_fc_recreate_io_queues(ctrl); } + + spin_lock_irqsave(&ctrl->lock, flags); if (!ret && test_bit(ASSOC_FAILED, &ctrl->flags)) ret = -EIO; - if (ret) + if (ret) { + spin_unlock_irqrestore(&ctrl->lock, flags); goto out_term_aen_ops; - + } changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); + spin_unlock_irqrestore(&ctrl->lock, flags); ctrl->ctrl.nr_reconnects = 0; |