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nvme-rdma: fix sysfs invoked reset_ctrl error flow 

When reset_controller that is invoked by sysfs fails,
it enters an error flow which practically removes the
nvme ctrl entirely (similar to delete_ctrl flow). It
causes the system to hang, since a sysfs attribute cannot
be unregistered by one of its own methods.

This can be fixed by calling delete_ctrl as a work rather
than sequential code. In addition, it should give the ctrl
a chance to recover using reconnection mechanism (consistant
with FC reset_ctrl error flow). Also, while we're here, return
suitable errno in case the reset ended with non live ctrl.

Signed-off-by: Nitzan Carmi <nitzanc@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Nitzan Carmi 2018-01-17 11:01:14 +00:00 committed by Sagi Grimberg
parent 7756f72ccd
commit 8000d1fdb0
2 changed files with 7 additions and 6 deletions
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6
drivers/nvme/host/core.c
View File

@ -120,8 +120,12 @@ int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl)
int ret;
ret = nvme_reset_ctrl(ctrl);
if (!ret)
if (!ret) {
flush_work(&ctrl->reset_work);
if (ctrl->state != NVME_CTRL_LIVE)
ret = -ENETRESET;
}
return ret;
}
EXPORT_SYMBOL_GPL(nvme_reset_ctrl_sync);

7
drivers/nvme/host/rdma.c
View File

@ -1784,11 +1784,8 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work)
return;
out_fail:
dev_warn(ctrl->ctrl.device, "Removing after reset failure\n");
nvme_remove_namespaces(&ctrl->ctrl);
nvme_rdma_shutdown_ctrl(ctrl, true);
nvme_uninit_ctrl(&ctrl->ctrl);
nvme_put_ctrl(&ctrl->ctrl);
++ctrl->ctrl.nr_reconnects;
nvme_rdma_reconnect_or_remove(ctrl);
}
static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = {