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>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 52b3626..0fe7ea3 100644 (file)
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -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);

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 5e2cc4f..3a51ed5 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -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 = {