staging/rdma/hfi1: Fix debugfs access race

Debugfs access races with the driver being ready.  Make sure the
driver is ready before debugfs files appear and debufs files are
gone before the driver starts tearing down.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/staging/rdma/hfi1/init.c b/drivers/staging/rdma/hfi1/init.c
index 2def538..371ed29 100644 (file)
--- a/drivers/staging/rdma/hfi1/init.c
+++ b/drivers/staging/rdma/hfi1/init.c
@@ -983,7 +983,6 @@ void hfi1_free_devdata(struct hfi1_devdata *dd)
        list_del(&dd->list);
        spin_unlock_irqrestore(&hfi1_devs_lock, flags);
        free_platform_config(dd);
-       hfi1_dbg_ibdev_exit(&dd->verbs_dev);
        rcu_barrier(); /* wait for rcu callbacks to complete */
        free_percpu(dd->int_counter);
        free_percpu(dd->rcv_limit);
@@ -1088,7 +1087,6 @@ struct hfi1_devdata *hfi1_alloc_devdata(struct pci_dev *pdev, size_t extra)
                        &pdev->dev,
                        "Could not alloc cpulist info, cpu affinity might be wrong\n");
        }
-       hfi1_dbg_ibdev_init(&dd->verbs_dev);
        return dd;
 
 bail:
@@ -1445,8 +1443,11 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         * we still create devices, so diags, etc. can be used
         * to determine cause of problem.
         */
-       if (!initfail && !ret)
+       if (!initfail && !ret) {
                dd->flags |= HFI1_INITTED;
+               /* create debufs files after init and ib register */
+               hfi1_dbg_ibdev_init(&dd->verbs_dev);
+       }
 
        j = hfi1_device_create(dd);
        if (j)
@@ -1487,6 +1488,8 @@ static void remove_one(struct pci_dev *pdev)
 {
        struct hfi1_devdata *dd = pci_get_drvdata(pdev);
 
+       /* close debugfs files before ib unregister */
+       hfi1_dbg_ibdev_exit(&dd->verbs_dev);
        /* unregister from IB core */
        hfi1_unregister_ib_device(dd);